Apparatus and method for diagnosing faults in an automotive lighting system

Abstract

The application discloses a device and method for diagnosing faults of an automobile lamp system, comprising a first adapter wire harness, a second adapter wire harness and a signal acquisition and diagnosis device; the first adapter wire harness comprises a first adapter wire harness connector and a first wire harness group connected with the first adapter wire harness connector; the second adapter wire harness comprises a second adapter wire harness connector and a second wire harness group connected with the second adapter wire harness connector; the first adapter wire harness connector and the second adapter wire harness connector are connected with the diagnosis device; the signal acquisition and diagnosis device comprises a signal diagnosis and display device, a first signal acquisition wire harness and a second signal acquisition wire harness; the signal diagnosis and display device comprises a signal acquisition module, a signal processing module connected with the signal acquisition module, a signal selection module connected with the signal processing module and a diagnosis processor connected with the signal selection module; the application does not need to disassemble lamps and other parts, realizes rapid detection and rapid locking of fault parts.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile lamps, and particularly relates to a device and method for diagnosing faults of an automobile lamp system. BACKGROUND

[0002] With the continuous development of new technologies of automobile lamps, more and more new functions of lamps are applied to automobiles, the number of circuit connections of lamps with vehicle body controllers and other related parts is increasing, and the frequency of faults of lamp systems is also increasing.

[0003] Conventional automobile lamp systems, such as Figure 1 As shown in the figure, include a lamp starting switch 8, a vehicle harness A 7, a vehicle body controller 6, a vehicle harness B 5, and a lamp assembly 4. When a lamp system has a functional fault, the following methods are generally used for diagnosis:

[0004] Method 1: The positive and negative polarities of the harness corresponding to the lamp system circuit with a functional fault are stripped to expose the conductive wire, and a multimeter is externally connected to perform simple diagnosis through circuit signals. This method destroys the integrity of the harness, easily leading to problems such as short circuit and open circuit in the later stage, and has been prohibited in most automobile factory pre-sale and post-sale automobile lamp fault diagnosis. At the same time, for lamps arranged in the back door, engine compartment and other parts, due to the reasons such as the arrangement position being too biased or no operation space, the operation difficulty is extremely great. In addition, the multimeter can only perform simple diagnosis and cannot collect and output signals, making it difficult to perform detailed diagnosis analysis and guide problem rectification, and non-constant signals (such as PWM wave signals) cannot be normally displayed, so the lamp system functional fault of non-constant signals cannot be diagnosed.

[0005] Method 2: Without damaging the original vehicle parts, the lamp system parts are disassembled, and diagnosis and analysis are performed according to the diagnosis standards of each part. This method greatly increases the diagnosis cycle and reduces the rectification efficiency, and at the same time, since the diagnosis and analysis are not performed on the original vehicle, there are problems such as the fault cannot be reproduced.

[0006] In the prior art, patent document CN208766928U discloses an automobile light circuit detection connector, which comprises a fault setting device, a headlight switch harness connector, and a fault detection seat. When in use, the fault is set by the fault setting device, the circuit is simulated to be open, and the circuit signal change before and after the open is detected by the fault detection seat. The automobile light circuit detection connector is applied to teaching and training, only a simple simulation of the circuit fault of "open" is performed, other fault modes of the actual vehicle cannot be diagnosed and analyzed, and at the same time, the automobile light circuit detection connector ignores the fault of the vehicle body controller, the vehicle harness and other parts, and cannot perform systematic and scientific diagnosis and analysis on the entire automobile lamp system.

[0007] Therefore, there is a need to develop a new device and method for diagnosing faults of an automobile lamp system. SUMMARY

[0008] The purpose of the present application is to provide a device and method for diagnosing faults of an automobile lamp system without disassembling the lamp and other parts, which can realize rapid detection and rapid locking of the faulty parts.

[0009] In a first aspect, the present application provides a device for diagnosing faults of an automobile lamp system, comprising a first adapter wire harness, a second adapter wire harness, and a signal acquisition and diagnosis device.

[0010] The first adapter wire harness comprises a first adapter wire harness connector and a first wire harness group connected to the first adapter wire harness connector, wherein the first wire harness group comprises a plurality of wire harnesses, and each wire harness is provided with a male connector and a female connector.

[0011] The second adapter wire harness comprises a second adapter wire harness connector and a second wire harness group connected to the second adapter wire harness connector, wherein the second wire harness group comprises a plurality of wire harnesses, and each wire harness is provided with a male connector and a female connector.

[0012] The first adapter wire harness connector and the second adapter wire harness connector are connected to the diagnosis device.

[0013] The signal acquisition and diagnosis device comprises a signal diagnosis and display device, a first signal acquisition wire harness, and a second signal acquisition wire harness.

[0014] The signal diagnosis and display device comprises a signal acquisition module, a signal processing module connected to the signal acquisition module, a signal selection module connected to the signal processing module, a diagnosis processor connected to the signal selection module, and a signal display screen and a diagnosis display screen connected to the diagnosis processor, respectively.

[0015] One end of the first signal acquisition wire harness is used to connect to the negative pole of the functional wire harness with faults in the automobile lamp system, and the other end of the first signal acquisition wire harness is connected to the negative pole of the signal diagnosis and display device.

[0016] One end of the second signal acquisition wire harness is used to connect to the positive pole of the functional wire harness with faults in the automobile lamp system, and the other end of the second signal acquisition wire harness is connected to the positive pole of the signal diagnosis and display device.

[0017] The signal diagnosis and display device is used to send the voltage signals and current signals collected by the first signal acquisition wire harness and the second signal acquisition wire harness to the signal display screen for display, process the collected voltage signals and current signals, diagnose faults based on the collected voltage signals and current signals, and send the diagnosis results to the diagnosis display screen for display.

[0018] Optionally, the signal diagnosis and display device is configured to compare the collected voltage signal value with a preset normal voltage value range, and if the collected voltage signal value is not within the preset normal voltage value range, output a signal failure instruction, and if the collected voltage signal value is within the preset normal voltage value range, compare the collected current signal value with a preset normal current value range, and if the collected current signal value is not within the preset normal current value range, output a signal failure instruction, and if the collected current signal value is within the preset normal voltage value range, output a signal normal instruction.

[0019] Optionally, the diagnosis processor comprises a high beam diagnosis unit, a low beam diagnosis unit, a turn signal diagnosis unit, and a position lamp diagnosis unit.

[0020] Optionally, the signal selection module comprises a high beam gear, a low beam gear, a turn signal gear, and a position lamp gear.

[0021] Optionally, the first wire harness group comprises a first wire harness A, a second wire harness A, a third wire harness A, a fourth wire harness A, and a fifth wire harness A.

[0022] The second wire harness group comprises a first wire harness B, a second wire harness B, a third wire harness B, a fourth wire harness B, and a fifth wire harness B.

[0023] The first wire harness A, the second wire harness A, the third wire harness A, the fourth wire harness A, and the fifth wire harness A are connected to the first wire harness B, the second wire harness B, the third wire harness B, the fourth wire harness B, and the fifth wire harness B, respectively.

[0024] In a second aspect, the present application provides a method for diagnosing faults of an automobile lamp system, which uses the device for diagnosing faults of an automobile lamp system as described above, and the method comprises the following steps:

[0025] When the lamp system fails, the device for diagnosing faults of an automobile lamp system is connected in series to the automobile lamp system.

[0026] Start and debug the signal diagnosis and display device, then connect the positive pole of the faulty functional wire harness to the positive pole of the signal diagnosis and display device through the second signal collection wire harness, and connect the negative pole of the faulty functional wire harness to the negative pole of the signal diagnosis and display device through the first signal collection wire harness, collect signals, and press the corresponding gear to diagnose.

[0027] Send the collected voltage signal and current signal to the signal display screen for display, and send the diagnosis result to the diagnosis display screen for display.

[0028] Optionally, the method specifically comprises the following steps:

[0029] S1, disconnect the already plugged vehicle wire harness B connector A and the lamp assembly connector, and respectively plug with the first adapter wire harness connector and the second adapter wire harness connector, collect the voltage and current signals on the fault function wire harness, through the diagnosis and display of the signal diagnosis and display device, determine whether the signal meets the input signal requirements of the normal work of the lamp assembly, if it meets, it is determined that the lamp assembly is faulty, and detailed fault analysis of the lamp assembly is required; if it does not meet, the lamp assembly fault is excluded, and S2 is executed;

[0030] S2, restore the plug of the vehicle wire harness B connector A and the lamp assembly connector, disconnect the already plugged vehicle wire harness B connector B and the body controller output connector, and respectively plug with the first adapter wire harness connector and the second adapter wire harness connector, collect the voltage and current signals on the fault function wire harness, through the diagnosis and display of the signal diagnosis and display device, determine whether the signal meets the output signal requirements of the body controller, if it meets, it is determined that the vehicle wire harness B is faulty, and detailed fault analysis of the vehicle wire harness B is required; if it does not meet, the vehicle wire harness B fault is excluded, and S3 is executed;

[0031] S3, restore the plug of the vehicle wire harness B connector B and the body controller output connector, disconnect the already plugged vehicle wire harness A connector A and the body controller input connector, and respectively plug with the first adapter wire harness connector and the second adapter wire harness connector, collect the voltage and current signals on the fault function wire harness, through the diagnosis and display of the signal diagnosis and display device, determine whether the signal meets the input signal requirements of the body controller, if it meets, it is determined that the body controller is faulty, and detailed fault analysis of the body controller is required; if it does not meet, the body controller fault is excluded, and S4 is executed;

[0032] S4, restore the plug of the vehicle wire harness A connector A and the body controller input connector, disconnect the already plugged vehicle wire harness A connector B and the lamp starting switch connector, and respectively plug with the first adapter wire harness connector and the second adapter wire harness connector, collect the voltage and current signals on the fault function wire harness, through the diagnosis and display of the signal diagnosis and display device, determine whether the signal meets the output signal requirements of the lamp starting switch, if it meets, it is determined that the vehicle wire harness A is faulty, and detailed fault analysis of the vehicle wire harness A is required; if it does not meet, it is determined that the lamp starting switch is faulty, and detailed fault analysis of the lamp starting switch is required, and the diagnosis is ended.

[0033] The present application has the following advantages: the present application does not need to damage the whole vehicle wire harness and other parts wire harness, does not need to disassemble the lamps and other parts, realizes quick detection, quickly locks the faulty parts, and provides a large amount of circuit signals for the next detailed analysis, the present application greatly improves the efficiency and operation convenience of the lamp system problem diagnosis, and avoids the quality problems caused by the damage of the original vehicle parts. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some of the embodiments of the present application, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0035] Figure 1 is a schematic diagram of an automobile lamp system;

[0036] Figure 2 is a schematic diagram of the structure of the present application;

[0037] Figure 3 is a working principle diagram of the signal acquisition and diagnosis device in the present application;

[0038] Figure 4 is a diagnosis principle diagram of the program in the signal acquisition and diagnosis device in the present application;

[0039] Figure 5 is an operation schematic diagram of the present application;

[0040] Figure 6 is a flow chart of the method of lamp system fault diagnosis in the present application;

[0041] In the diagram: 1. First adapter harness; 11. First adapter harness connector; 12. First harness A; 13. Second harness A; 14. Third harness A; 15. Fourth harness A; 16. Fifth harness A; 2. Second adapter harness; 21. Second adapter harness connector; 22. First harness B; 23. Second harness B; 24. Third harness B; 25. Fourth harness B; 26. Fifth harness B; 3. Signal acquisition and diagnostic device; 31. Signal diagnostic and display device; 311. Signal display screen; 312. Diagnostic display screen; 313. Signal acquisition module; 314. Signal processing module; 315. Signal selection module; 3151. High beam mode; 3152. Low beam mode; 3153. Turn signal mode; 3154. Position light mode; 316. Diagnostic processor; 32. First signal acquisition harness; 33. Second signal acquisition harness. 4. Lighting assembly; 41. Lighting assembly connector; 5. Vehicle wiring harness B; 51. Vehicle wiring harness B connector A; 52. Vehicle wiring harness B connector B; 6. Body control unit; 61. Body control unit output connector; 62. Body control unit input connector; 7. Vehicle wiring harness A; 71. Vehicle wiring harness A connector A; 72. Vehicle wiring harness A connector B; 8. Lighting start switch; 81. Lighting start switch connector. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the automotive lighting system consists of a lamp start switch 8, a vehicle wiring harness A7, a body controller 6, a vehicle wiring harness B5, and a lamp assembly 4. These components are interconnected via lamp start switch connector 81, vehicle wiring harness A connector B72, vehicle wiring harness A connector A71, body controller input connector 62, body controller output connector 61, vehicle wiring harness B connector B52, vehicle wiring harness B connector A51, and lamp assembly connector 41, forming a complete circuit system. Commands are transmitted via voltage and current signals. When a lamp function is activated on the lamp start switch 8, the command signal is input to the vehicle controller 6 via vehicle wiring harness A7. The vehicle controller 6 processes the signal internally and transmits it to the lamp assembly 4 via vehicle wiring harness B5, illuminating the corresponding lamp.

[0044] like Figure 2 As shown in this embodiment, a device for diagnosing faults in an automotive lighting system includes a first adapter harness 1, a second adapter harness 2, and a signal acquisition and diagnostic device 3.

[0045] like Figure 2As shown in the embodiment, the first adapter harness 1 comprises a first adapter harness connector 11 and a first harness group connected to the first adapter harness connector 11, the first harness group comprises a plurality of harnesses, and each of the harnesses is provided with a male connector and a female connector.

[0046] As shown in the embodiment, the second adapter harness 2 comprises a second adapter harness connector 21 and a second harness group connected to the second adapter harness connector 21, the second harness group comprises a plurality of harnesses, and each of the harnesses is provided with a male connector and a female connector. Figure 2

[0047] In the fault diagnosis, the device for diagnosing the fault of the automobile lamp system is connected in series to the automobile lamp system, each harness of the first harness group is correspondingly connected to each harness of the second harness group, and the harnesses are used to carry and transmit circuit signals of each function of the lamp assembly 4, such as the low beam positive electrode, the high beam positive electrode, the front turn signal positive electrode, the front position lamp positive electrode, the daytime running light positive electrode, the light adjustment motor positive electrode, the lamp negative electrode, the LED turn signal diagnosis feedback, the time sequence welcome mode 1, the time sequence welcome mode 2, and the like. The lengths of the harnesses of the first harness group and the second harness group can be designed flexibly according to the working conditions.

[0048] In actual use, in order to adapt to different lamp assemblies and part connectors of the lamp system, the device provides a plurality of adapter harnesses that can be connected to different lamp assemblies and part connectors of the lamp system, that is, the first harness group comprises a first harness A12, a second harness A13, a third harness A14, a fourth harness A15, and a fifth harness A16. The second harness group comprises a first harness B22, a second harness B23, a third harness B24, a fourth harness B25, and a fifth harness B26. The first harness A12, the second harness A13, the third harness A14, the fourth harness A15, and the fifth harness A16 are connected to the first harness B22, the second harness B23, the third harness B24, the fourth harness B25, and the fifth harness B26, respectively, and can be connected to different lamp assemblies and part connectors of the lamp system.

[0049] As shown in the embodiment, the second adapter harness 2 comprises a second adapter harness connector 21 and a second harness group connected to the second adapter harness connector 21, the second harness group comprises a plurality of harnesses, and each of the harnesses is provided with a male connector and a female connector. Figure 2 ​As shown, in the embodiment, the first adapter wire harness connector 11 and the second adapter wire harness connector 21 are connected with the diagnostic device 3. The signal acquisition and diagnostic device 3 comprises a signal diagnosis and display device 31, a first signal acquisition wire harness 32 and a second signal acquisition wire harness 33. The signal diagnosis and display device 31 comprises a signal acquisition module 313, a signal processing module 314 connected with the signal acquisition module 313, a signal selection module 315 connected with the signal processing module 314, a diagnostic processor 316 connected with the signal selection module 315, and a signal display screen 311 and a diagnostic display screen 312 respectively connected with the diagnostic processor 316. One end of the first signal acquisition wire harness 32 is used for being connected with the negative pole of the functional wire harness with fault in the automobile lamp system, and the other end of the first signal acquisition wire harness 32 is connected with the negative pole of the signal diagnosis and display device 31. One end of the second signal acquisition wire harness 33 is used for being connected with the positive pole of the functional wire harness with fault in the automobile lamp system, and the other end of the second signal acquisition wire harness 33 is connected with the positive pole of the signal diagnosis and display device 31. The signal diagnosis and display device 31 is used for sending the voltage signal and the current signal collected by the first signal acquisition wire harness 32 and the second signal acquisition wire harness 33 to the signal display screen 311 for display, and the display mode of the signal can be adjusted. Meanwhile, the voltage signal and the current signal collected are processed, and the fault diagnosis is performed based on the collected voltage signal and current signal, and the diagnostic result is sent to the diagnostic display screen 312 for display. In addition, the device can store the voltage, current and other signals, and support external storage for downloading and uploading computer software for analysis.

[0050] In the embodiment, the signal diagnosis and display device 31 is used for comparing the collected voltage signal value with the preset normal voltage value range. If the collected voltage signal value is not within the preset normal voltage value range, a signal fault instruction is output. If the collected voltage signal value is within the preset normal voltage value range, the collected current signal value is compared with the preset normal current value range. If the collected current signal value is not within the preset normal current value range, a signal fault instruction is output. If the collected current signal value is within the preset normal voltage value range, a signal normal instruction is output.

[0051] As shown in the figure, Figure 3 In the embodiment, the diagnostic processor comprises a high beam diagnosis unit, a low beam diagnosis unit, a turn signal diagnosis unit and a position lamp diagnosis unit.

[0052] As shown in the figure, Figure 2 In the embodiment, the signal selection module comprises a high beam gear 3151, a low beam gear 3152, a turn signal gear 3153 and a position lamp gear 3154.

[0053] In combination withFigure 2 、 Figure 3 and Figure 4 The working principle of the signal diagnosis and display device 31 is described as follows:

[0054] 1. The voltage and current signals are transmitted to the signal diagnosis and display device 31 through the connection of the positive and negative pole heads with the first signal collection wire harness 32 and the second signal collection wire harness 33, and the signal collection is completed.

[0055] 2. The collected voltage and current signals are processed and converted into values recognizable by the internal program.

[0056] 3. According to the malfunctioning function, the corresponding gear is pressed, such as the high beam gear 3151, the low beam gear 3152, the turn signal gear 3153, and the position light gear 3154, etc., to determine the diagnosis channel.

[0057] 4. The input values are diagnosed by the internal diagnosis unit, and the diagnosis results are output.

[0058] 5. The diagnosis results are displayed through the diagnosis display screen 312.

[0059] In combination with Figure 4 The diagnosis logic of the signal diagnosis and display device is described:

[0060] A1. The collected voltage signal value is compared with the preset normal voltage value range. If it is not within the normal voltage value range, the "signal fault" instruction is output. If it is within the normal voltage value range, A2 is executed.

[0061] A2. The collected current signal value is compared with the internal normal current value range. If it is not within the normal current value range, the "signal fault" instruction is output. If it is within the normal voltage value range, the "signal normal" instruction is output.

[0062] In this embodiment, a method for diagnosing faults of an automobile lamp system is adopted, which uses the device for diagnosing faults of the automobile lamp system as described in this embodiment. The method includes the following steps:

[0063] When the lamp system fails, the device for diagnosing faults of the automobile lamp system is connected in series to the automobile lamp system.

[0064] Start and debug the signal diagnosis and display device 31, then connect the positive pole of the faulty function wire harness to the positive pole head of the signal diagnosis and display device 31 through the second signal collection wire harness 33, and connect the negative pole of the faulty function wire harness to the negative pole head of the signal diagnosis and display device 31 through the first signal collection wire harness 32, perform signal collection, and press the corresponding gear to diagnose.

[0065] The collected voltage signal and current signal are sent to the signal display screen 311 for display, and the diagnosis result is sent to the diagnosis display screen 312 for display.

[0066] In combination Figure 3 , Figure 4 , Figure 5 , Figure 6 The fault diagnosis method and steps of the lamp system are described as follows:

[0067] S1, disconnect the already plugged vehicle wire harness B connector A51 and the lamp assembly connector 41, and plug them with the first adapter wire harness connector 11 and the second adapter wire harness connector 21 respectively, collect the voltage and current signals on the fault function wire harness, and determine whether the signals meet the normal working input signal requirements of the lamp assembly 4 through the diagnosis and display of the signal diagnosis and display device 31. If yes, it is determined that the lamp assembly 4 is faulty, and detailed fault analysis of the lamp assembly 4 is required. If not, the lamp assembly 4 is excluded from the fault, and S2 is executed.

[0068] S2, restore the plugging of the vehicle wire harness B connector A51 and the lamp assembly connector 41, disconnect the already plugged vehicle wire harness B connector B52 and the body controller output connector 61, and plug them with the first adapter wire harness connector 11 and the second adapter wire harness connector 21 respectively, collect the voltage and current signals on the fault function wire harness, and determine whether the signals meet the body controller output signal requirements through the diagnosis and display of the signal diagnosis and display device 31. If yes, it is determined that the vehicle wire harness B 5 is faulty, and detailed fault analysis of the vehicle wire harness B 5 is required. If not, the vehicle wire harness B 5 is excluded from the fault, and S3 is executed.

[0069] S3, restore the plugging of the vehicle wire harness B connector B52 and the body controller output connector 61, disconnect the already plugged vehicle wire harness A connector A71 and the body controller input connector 62, and plug them with the first adapter wire harness connector 11 and the second adapter wire harness connector 21 respectively, collect the voltage and current signals on the fault function wire harness, and determine whether the signals meet the body controller input signal requirements through the diagnosis and display of the signal diagnosis and display device 31. If yes, it is determined that the body controller 6 is faulty, and detailed fault analysis of the body controller 6 is required. If not, the body controller 6 is excluded from the fault, and S4 is executed.

[0070] S4, the recovery of the whole vehicle wire harness A connector A71 and the vehicle body controller input connector 62, disconnect the whole vehicle wire harness A connector B72 and the lamp starting switch connector 81, and respectively connect with the first adapter wire harness connector 11 and the second adapter wire harness connector 21, collect the voltage and current signals on the fault function wire harness, through the diagnosis and display of the signal diagnosis and display device 31, determine whether the signal meets the output signal requirements of the lamp starting switch 8, if it meets, it is determined that the whole vehicle wire harness A7 is faulty, and the whole vehicle wire harness A7 needs to be analyzed in detail; if it does not meet, it is determined that the lamp starting switch 8 is faulty, and the lamp starting switch 8 needs to be analyzed in detail, and the diagnosis is ended.

[0071] The device described in the embodiment is convenient to operate, and the diagnosis method and steps are simple and easy to understand. Without damaging the whole vehicle wire harness and other parts wire harness, without disassembling the lamp and other parts, the device realizes rapid detection and rapid locking of the faulty parts, and provides a large amount of circuit signal materials for the next detailed analysis. The present application greatly improves the efficiency and operation convenience of the lamp system problem diagnosis, and guarantees the integrity of the original vehicle parts, avoiding the quality problems caused by damaging the parts.

[0072] The above embodiment is the preferred embodiment of the present application, but the embodiment of the present application is not limited to the above embodiment, and any change, modification, substitution, combination, simplification made without departing from the spirit and principles of the present application should be an equivalent replacement method, which is included in the protection scope of the present application.

Claims

1. A device for diagnosing faults in automotive lighting systems, characterized in that: The first adapter harness (1), the second adapter harness (2) and the signal acquisition and diagnosis device (3) are included. The first adapter harness (1) includes a first adapter harness connector (11) and a first harness group connected with the first adapter harness connector (11), the first harness group includes a plurality of harnesses, and each harness is provided with a male connector and a female connector. The second adapter harness (2) includes a second adapter harness connector (21) and a second harness group connected with the second adapter harness connector (21), the second harness group includes a plurality of harnesses, and each harness is provided with a male connector and a female connector. The first adapter harness connector (11) and the second adapter harness connector (21) are connected with the diagnosis device (3). The signal acquisition and diagnosis device (3) includes a signal diagnosis and display device (31), a first signal acquisition harness (32) and a second signal acquisition harness (33). The signal diagnosis and display device (31) includes a signal acquisition module (313), a signal processing module (314) connected with the signal acquisition module (313), a signal selection module (315) connected with the signal processing module (314), a diagnosis processor (316) connected with the signal selection module (315), and a signal display screen (311) and a diagnosis display screen (312) connected with the diagnosis processor (316) respectively. One end of the first signal acquisition harness (32) is used for butt joint with the negative pole of the functional harness with fault in the automobile lamp system, and the other end of the first signal acquisition harness (32) is butt joint with the negative pole of the signal diagnosis and display device (31). One end of the second signal acquisition harness (33) is used for butt joint with the positive pole of the functional harness with fault in the automobile lamp system, and the other end of the second signal acquisition harness (33) is butt joint with the positive pole of the signal diagnosis and display device (31). The signal diagnosis and display device (31) is used for sending the voltage signal and the current signal collected by the first signal acquisition harness (32) and the second signal acquisition harness (33) to the signal display screen (311) for display, processing the collected voltage signal and current signal, diagnosing the fault based on the collected voltage signal and current signal, and sending the diagnosis result to the diagnosis display screen (312) for display. The diagnosis processor includes a high beam diagnosis unit, a low beam diagnosis unit, a turn signal diagnosis unit and a position lamp diagnosis unit. The signal selection module includes a high beam gear (3151), a low beam gear (3152), a turn signal gear (3153) and a position lamp gear (3154).

2. The apparatus of claim 1, wherein: The signal diagnosis and display device (31) is used for comparing the collected voltage signal value with the preset normal voltage value range, if the collected voltage signal value is not in the preset normal voltage value range, a signal fault instruction is output, if the collected voltage signal value is in the preset normal voltage value range, the collected current signal value is compared with the preset normal current value range, if the collected current signal value is not in the preset normal current value range, a signal fault instruction is output, if the collected current signal value is in the preset normal voltage value range, a signal normal instruction is output.

3. The apparatus of claim 1, wherein: The first wire harness group comprises a first wire harness A (12), a second wire harness A (13), a third wire harness A (14), a fourth wire harness A (15) and a fifth wire harness A (16); The second wire harness group comprises a first wire harness B (22), a second wire harness B (23), a third wire harness B (24), a fourth wire harness B (25) and a fifth wire harness B (26); The first wire harness A (12), the second wire harness A (13), the third wire harness A (14), the fourth wire harness A (15) and the fifth wire harness A (16) are connected with the first wire harness B (22), the second wire harness B (23), the third wire harness B (24), the fourth wire harness B (25) and the fifth wire harness B (26) one by one.

4. A method of diagnosing a fault in an automotive lamp system, characterized by: The method of the device for diagnosing system failure of automobile lamps comprises the following steps: When the lamp system fails, the device for diagnosing system failure of automobile lamps is connected in series to the automobile lamp system; The signal diagnosis and display device (31) is started and debugged, then the positive pole of the functional wire harness with failure is connected to the positive pole lug of the signal diagnosis and display device (31) through the second signal collection wire harness (33), the negative pole of the functional wire harness with failure is connected to the negative pole lug of the signal diagnosis and display device (31) through the first signal collection wire harness (32), signal collection is carried out, and diagnosis is carried out by pressing the corresponding gear. The collected voltage signal and current signal are sent to the signal display screen (311) for display, and the diagnosis result is sent to the diagnosis display screen (312) for display.

5. The method of diagnosing a fault in an automotive lighting system of claim 4, wherein: The method specifically comprises the following steps: S1, disconnect the whole vehicle wire harness B connector A (51) and the lamp assembly connector (41) which have been connected, and connect them with the first adapter wire harness connector (11) and the second adapter wire harness connector (21) respectively, collect the voltage and current signals on the fault functional wire harness, determine whether the signals meet the normal working input signal requirements of the lamp assembly (4) through diagnosis and display of the signal diagnosis and display device (31), if yes, it is determined that the lamp assembly (4) is faulty, and detailed fault analysis of the lamp assembly (4) is required; if not, the lamp assembly (4) is excluded from failure, and S2 is executed. S2, restore the plug of the whole vehicle wire harness B connector A (51) and the lamp assembly connector (41), disconnect the whole vehicle wire harness B connector B (52) which has been plugged and the body controller output connector (61), and plug with the first adapter wire harness connector (11) and the second adapter wire harness connector (21) respectively, collect the voltage and current signals on the fault function wire harness, determine whether the signals meet the body controller output signal requirements through the diagnosis and display of the signal diagnosis and display device (31), if yes, it is determined that the whole vehicle wire harness B (5) is faulty, and the whole vehicle wire harness B (5) needs to be analyzed in detail; if not, the whole vehicle wire harness B (5) is excluded, and S3 is executed; S3, restore the plug of the whole vehicle wire harness B connector B (52) and the body controller output connector (61), disconnect the whole vehicle wire harness A connector A (71) which has been plugged and the body controller input connector (62), and plug with the first adapter wire harness connector (11) and the second adapter wire harness connector (21) respectively, collect the voltage and current signals on the fault function wire harness, determine whether the signals meet the body controller input signal requirements through the diagnosis and display of the signal diagnosis and display device (31), if yes, it is determined that the body controller (6) is faulty, and the body controller (6) needs to be analyzed in detail; if not, the body controller (6) is excluded, and S4 is executed; S4, restore the plug of the whole vehicle wire harness A connector A (71) and the body controller input connector (62), disconnect the whole vehicle wire harness A connector B (72) which has been plugged and the lamp starting switch connector (81), and plug with the first adapter wire harness connector (11) and the second adapter wire harness connector (21) respectively, collect the voltage and current signals on the fault function wire harness, determine whether the signals meet the lamp starting switch (8) output signal requirements through the diagnosis and display of the signal diagnosis and display device (31), if yes, it is determined that the whole vehicle wire harness A (7) is faulty, and the whole vehicle wire harness A (7) needs to be analyzed in detail; if not, it is determined that the lamp starting switch (8) is faulty, and the lamp starting switch (8) needs to be analyzed in detail, and the diagnosis is ended.

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