Air conditioner panel detection equipment

Abstract

The utility model relates to the technical field of air conditioner panel detection in automobile manufacturing, and particularly discloses air conditioner panel detection equipment, which comprises a main frame body and a rotating disc, and the rotating disc is horizontally and rotatably mounted in the main frame body; the rotating disc is sequentially provided with six detection stations in the circumferential direction, the first detection station is used for taking and placing an air conditioner panel, the second detection station is used for conducting backlight detection, the third detection station and the fourth detection station are used for detecting the function, the rotating torque and the stroke of a rotary knob, and the fifth detection station is used for detecting the function, the stroke and the shifting force value of a shifting knob. The sixth detection station is used for detecting the function, stroke and pressing force value of the knob; the air conditioner panel is in a power-on state during detection. According to the air conditioner panel detection device, the air conditioner panels are detected differently, the risk of missing detection is effectively reduced, the final quality of the air conditioner panels is guaranteed, the six detection stations can work at the same time, the detection efficiency of the air conditioner panels is improved, and the labor cost is saved.

Description

Technical Field

[0001] This application relates to the technical field of air conditioning panel testing in automobile manufacturing, and in particular to an air conditioning panel testing device. Background Technology

[0002] During the production of air conditioner panels, it is necessary to test the functions of the knobs and toggle switches on the panel. Air conditioner panel testing is generally a dual-station process: an external manual inspection of the knobs and toggle switches, and an internal darkroom inspection of the panel's backlighting.

[0003] However, manual inspection cannot identify whether the pressing force, rotation torque and stroke of the air conditioner panel knobs are qualified, or whether the turning force and stroke of the toggle knobs are qualified. It cannot display the force curve and cannot identify the misinstallation of the air conditioner panel knobs and toggle knobs. In addition, it can only inspect a maximum of two air conditioner panels at the same time, resulting in low inspection efficiency. Utility Model Content

[0004] In order to provide an apparatus for automatically detecting the pressing force, rotational torque and stroke of air conditioner panel knobs, as well as the turning force and stroke of toggle knobs, this application provides an air conditioner panel testing apparatus.

[0005] This application provides an air conditioner panel testing device, which adopts the following technical solution:

[0006] An air conditioner panel testing device includes a main frame and a rotating disk, the rotating disk being horizontally rotatably mounted in the main frame; the rotating disk is provided with a first testing station, a second testing station, a third testing station, a fourth testing station, a fifth testing station, and a sixth testing station in sequence along its circumference; the first testing station is used for picking up and placing air conditioner panels; the second testing station is used for backlight testing of the air conditioner panels; the third and fourth testing stations are used for testing the function, rotation torque, and stroke of the air conditioner panel knobs; the fifth testing station is used for testing the function, stroke, and turning force value of the air conditioner panel knobs; the sixth testing station is used for testing the function, stroke, and pressing force value of the air conditioner panel knobs; all air conditioner panels are powered on during testing.

[0007] By adopting the above technical solution, six testing stations can respectively test the function, rotation torque, pressing force and stroke of the knobs on the air conditioner panel, as well as the function, stroke and turning force of the toggle switch. This can effectively reduce the risk of missing air conditioner panel tests and ensure the final quality of the air conditioner panel. In addition, the simultaneous testing by the six testing stations improves the efficiency of air conditioner panel testing and saves labor costs.

[0008] Optionally, the second testing station includes a cover and a darkroom, the darkroom being slidably connected to the cover, and the darkroom sliding downwards to cover the periphery of the air conditioner panel; a forward CCD lens is fixedly installed in the cover, and the forward CCD lens is used to perform multiple backlight tests on the air conditioner panel.

[0009] By adopting the above technical solution, when the air conditioner panel enters the second testing station, the darkroom descends to cover the perimeter of the air conditioner panel and begins backlight testing; during backlight testing, the forward-facing CCD lens checks multiple times to determine whether the laser engraving pattern, decorative screws, backlight pattern, and working indicator light on the air conditioner panel are qualified.

[0010] Optionally, the second inspection station also includes a side CCD lens, which is fixedly mounted on the rotating disk and is used to check the direction of the air conditioning panel knobs.

[0011] By adopting the above technical solution, the side CCD lens can compare with standard parts to determine whether the direction of the knob is qualified, which helps to improve the final production quality of the air conditioner panel.

[0012] Optionally, the third detection station includes a second drive motor, a second cylinder, a first gripper, a first fixing plate, and a first servo rod. The second drive motor is mounted on the upper end of the second cylinder, and the first gripper is fixedly mounted on the lower end of the second cylinder. The second cylinder drives the first gripper to move downward and act on the knob. The second drive motor is used to drive the first gripper to rotate. The first fixing plate is fixedly connected to the second cylinder and the second drive motor respectively. The second cylinder is fixedly mounted on the first servo rod, and the first servo rod is used to drive the first gripper to act on different knobs in sequence.

[0013] By adopting the above technical solution, the second cylinder drives the first gripper to move downward, so that the first gripper acts on the knob, and the second drive motor drives the first gripper to rotate to detect the torque and its stroke; the first servo rod drives the first gripper to act on different knobs in sequence to realize the detection of the function, rotation torque and stroke of the knobs on the air conditioning panel.

[0014] Optionally, the fourth inspection station includes a third drive motor, a third cylinder, a second gripper, and a second fixing plate. The third drive motor is mounted on the upper end of the third cylinder, and the second gripper is fixedly connected to the lower end of the third cylinder. The third cylinder drives the second gripper to move downward and acts on the knob. The third drive motor is used to drive the second gripper to rotate. The second fixing plate is fixedly connected to the third cylinder and the third drive motor respectively.

[0015] By adopting the above technical solution, the third cylinder drives the second gripper to move downward, so that the second gripper acts on the knob, and the third drive motor drives the second gripper to rotate, thereby realizing the detection of the function, rotation torque and stroke of the knob on the air conditioning panel.

[0016] Optionally, the fifth detection station includes a fourth cylinder, a third gripper, a third fixing plate, a second servo rod, and a third servo rod. The third gripper is fixedly connected to the lower end of the fourth cylinder, and the fourth cylinder drives the third gripper to move downward and act on the toggle switch. The fourth cylinder is fixedly connected to the second servo rod, and the second servo rod is used to drive the fourth cylinder to move towards the center of the rotating disk to actuate the toggle switch. The second servo rod is mounted on the third servo rod through the third fixing plate, and the third servo rod is used to drive the third gripper to act on different toggle switches in sequence.

[0017] By adopting the above technical solution, the fourth cylinder drives the third gripper to move downward, so that the third gripper acts on the dial, and the second servo rod drives the third gripper to move to turn the dial, so as to detect the function, stroke and turning force value; the third servo rod drives the third gripper to act on different dials in sequence, so as to detect the function, stroke and turning force value of the dial on the air conditioning panel.

[0018] Optionally, the sixth detection station includes a fifth cylinder, a pressing block, a fourth fixing plate, and a fourth servo rod. The fifth cylinder is fixedly connected to the pressing block, and the fifth cylinder drives the pressing block to move downward and act on the knob. The fifth cylinder is fixedly connected to the fourth servo rod through the fourth fixing plate, and the fourth servo rod is used to drive the pressing block to act on different knobs in sequence.

[0019] By adopting the above technical solution, the fifth cylinder drives the pressing block to move downward, so that the pressing block acts on the knob to detect the function, stroke and pressing force value; the fourth servo rod drives the pressing block to act on different knobs in sequence to detect the function, stroke and pressing force value of the knobs on the air conditioning panel.

[0020] Optionally, the first detection station is used to perform pin short-circuit detection on the air conditioner panel.

[0021] By adopting the above technical solution, pin short circuit detection can be performed at the first detection station, which can detect potential short circuit problems as early as possible, effectively improve the safety of the detection process, and avoid wasting subsequent detection resources.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By setting up six testing stations to test the function, rotation torque, pressing force and stroke of the knobs on the air conditioner panel, as well as the function, stroke and turning force of the toggle switch, the risk of missing tests on the air conditioner panel can be effectively reduced, thus ensuring the final quality of the air conditioner panel.

[0024] 2. The six testing stations can perform testing simultaneously, which improves the efficiency of air conditioner panel testing and saves labor costs.

[0025] 3. By setting up a side CCD lens to determine whether the direction of the knob is qualified, it helps to improve the final production quality of the air conditioner panel. Attached Figure Description

[0026] Figure 1 This is a front view of an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application;

[0028] Figure 3 This is a schematic diagram illustrating the distribution of the six testing stations in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the overall structure of the air conditioner panel according to an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the overall structure of the second testing station according to an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the second detection station for removing the cover according to an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the overall structure of the third testing station in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the overall structure of the fourth detection station in an embodiment of this application;

[0034] Figure 9 This is a schematic diagram of the overall structure of the fifth detection station in an embodiment of this application;

[0035] Figure 10 This is a schematic diagram of the overall structure of the sixth detection station in an embodiment of this application.

[0036] Figure label:

[0037] 1. Main frame; 11. Rotary disc; 12. Reducer; 13. Wiring harness connector; 14. Power connector;

[0038] 2. First testing station;

[0039] 3. Second inspection station; 31. Cover; 32. Darkroom; 33. First cylinder; 34. Front-facing CCD lens; 35. Side-facing CCD lens;

[0040] 4. Third inspection station; 41. Second drive motor; 42. Second cylinder; 43. First gripper; 44. First fixing plate; 45. First servo rod;

[0041] 5. Fourth inspection station; 51. Third drive motor; 52. Third cylinder; 53. Second gripper; 54. Second fixing plate;

[0042] 6. Fifth inspection station; 61. Fourth cylinder; 62. Third gripper; 63. Third fixing plate; 64. Second servo rod; 65. Third servo rod;

[0043] 7. Sixth inspection station; 71. Fifth cylinder; 72. Pressing block; 73. Fourth fixing plate; 74. Fourth servo rod;

[0044] 8. Air conditioning panel; 81. Driving mode selection knob; 82. Volume knob; 83. Air conditioning knob; 84. Fan speed knob; 85. Front defrost knob; 86. Rear defrost knob; 87. Hazard warning knob; 88. Recirculation knob; 89. Customizable knob. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0046] This application discloses an air conditioner panel testing device, referring to... Figure 1 and Figure 2 It includes a main frame 1 and a rotating disk 11. The rotating disk 11 is horizontally installed in the main frame 1. A reducer 12 is provided below the rotating disk 11, and a first drive motor is provided below the reducer 12. The first drive motor drives the rotating disk 11 to rotate clockwise through the reducer 12.

[0047] Reference Figure 2 and Figure 3The rotating disk 11 has six inspection stations evenly arranged in a clockwise direction. The first inspection station 2 is used for picking up and placing the air conditioner panel 8; the second inspection station 3 is used for backlight inspection of the air conditioner panel 8; the third and fourth inspection stations 4 and 5 are used for inspecting the function, rotation torque, and stroke of the knobs on the air conditioner panel 8; the fifth inspection station 6 is used for inspecting the function, stroke, and actuation force of the toggle switches on the air conditioner panel 8; and the sixth inspection station 7 is used for inspecting the function, stroke, and pressing force of the knobs on the air conditioner panel 8. These six inspection stations perform different inspections on the air conditioner panel 8, effectively reducing the risk of missed inspections and ensuring the final quality of the air conditioner panel 8. Furthermore, the six inspection stations can work simultaneously, improving the efficiency of the air conditioner panel 8 inspection and saving labor costs.

[0048] Each testing station is equipped with a wire harness connector 13 below it, and each testing station is also equipped with a power plug 14 below it. A cylinder is installed on the power plug 14, and the cylinder drives the power plug 14 to move upward so that the power plug 14 is electrically connected to the wire harness connector 13. The air conditioner panel 8 is always powered on during testing.

[0049] Reference Figure 2 and Figure 4 In this embodiment, the air conditioning panel 8 includes a row of knobs and a row of toggle switches; there are four knobs, which are, in order, a driving mode selection knob 81, a volume knob 82, an air conditioning knob 83, and a fan speed knob 84; there are five toggle switches, which are, in order, a front defrost switch 85, a rear defrost switch 86, a hazard warning switch 87, an internal circulation switch 88, and a custom switch 89.

[0050] Place the air conditioner panel 8 into the first testing station 2, and after electrically connecting the power plug 14 to the wiring harness connector 13, perform a pin short circuit test. After the inspection is completed, rotate the rotating disk 11 clockwise, moving the air conditioner panel 8 into the second testing station 3.

[0051] Reference Figure 5 and Figure 6 The second testing station 3 includes a cover 31 and a darkroom 32, with the darkroom 32 slidably connected to the inside of the cover 31. A first cylinder 33 is installed between the cover 31 and the darkroom 32, and the first cylinder 33 drives the darkroom 32 to move downward, so that the darkroom 32 covers the sides of the air conditioner panel 8. (Refer to...) Figure 3 and Figure 6 A forward-facing CCD lens 34 is fixedly installed in the housing 31, facing downwards. The forward-facing CCD lens 34 can perform multiple backlight checks, inspecting the laser-engraved patterns, decorative screws, backlight patterns, and indicator lights on the air conditioning panel 8. A side CCD lens 35 is provided on the rotating disk 11, facing the second inspection station 3, and is used to check the direction of the knobs on the air conditioning panel 8.

[0052] After the air conditioner panel 8 enters the second inspection station 3, the first cylinder 33 drives the dark chamber 32 to descend, starting the backlight inspection. During the backlight inspection, the front CCD lens 34 compares the laser-engraved pattern, decorative screws, backlight pattern, and indicator light on the air conditioner panel 8 multiple times with a standard part to determine if they are qualified. After the backlight inspection is completed, the dark chamber 32 rises, and the side CCD lens 35 compares the direction of the knobs on the air conditioner panel 8 with a standard part to determine if they are qualified. If problems such as character errors, color errors, positional offsets, or inconsistent character sizes are found, the front CCD lens 34 and the side CCD lens 35 can identify them and issue an alarm. If the inspection is qualified, the inspection equipment will record a barcode for later traceability of the air conditioner panel 8. After the inspection is completed, the rotating disk 11 rotates clockwise, driving the air conditioner panel 8 into the third inspection station 4.

[0053] Reference Figure 2 and Figure 7 The third testing station 4 includes a second drive motor 41, a second cylinder 42, a first gripper 43, a first fixing plate 44, and a first servo rod 45. The first fixing plate 44 is fixed to one end of the second cylinder 42 away from the rotation axis of the rotating disk 11. The second drive motor 41 is mounted on the upper end of the second cylinder 42 and fixedly mounted on the first fixing plate 44. The second cylinder 42 drives the second drive motor 41 to move downward together. The first gripper 43 is fixedly mounted on the lower end of the second cylinder 42. During testing, the second cylinder 42 drives the first gripper 43 to move downward, so that the first gripper 43 acts on the sound knob 82, the air conditioning knob 83, or the fan speed knob 84. The second drive motor 41 drives the first gripper 43 to rotate, and the torque and stroke are tested. One end of the second cylinder 42, away from the rotation axis of the rotating disk 11, is fixedly connected to the first servo rod 45. The first servo rod 45 can drive the second cylinder 42 to move laterally, so that the first gripper 43 acts on the fan speed knob 84, the air conditioning knob 83, and the volume knob 82 in sequence. After the test is completed, the rotating disk 11 rotates clockwise, driving the air conditioning panel 8 into the fourth test station 5.

[0054] Reference Figure 2 and Figure 8The fourth inspection station 5 includes a third drive motor 51, a third cylinder 52, a second gripper 53, and a second fixing plate 54. The second fixing plate 54 is fixedly connected to one end of the third cylinder 52 away from the rotation axis of the rotating disk 11. The third drive motor 51 is mounted on the upper end of the third cylinder 52 and is fixedly mounted on the second fixing plate 54. The third cylinder 52 drives the third drive motor 51 to move downwards together. The third cylinder 52 is fixedly connected in the main frame 1. The second gripper 53 is fixedly connected to the lower end of the third cylinder 52. During inspection, the third cylinder 52 drives the second gripper 53 to move downwards, causing the second gripper 53 to act on the driving mode selection knob 81. The third drive motor 51 drives the second gripper 53 to rotate, performing torque and stroke detection. After inspection, the rotating disk 11 rotates clockwise, driving the air conditioning panel 8 into the fifth inspection station 6.

[0055] Reference Figure 2 and Figure 9 The fifth testing station 6 includes a fourth cylinder 61, a third gripper 62, a third fixing plate 63, a second servo rod 64, and a third servo rod 65. The fourth cylinder 61 is fixed to the second servo rod 64, which can drive the fourth cylinder 61 to move towards the center of the rotating disk 11. The third gripper 62 is fixedly connected to the lower end of the fourth cylinder 61, and the fourth cylinder 61 can drive the third gripper 62 to move downward. During testing, the fourth cylinder 61 drives the third gripper 62 to move downward, so that the third gripper 62 acts on the front defogger 85, the rear defogger 86, the hazard warning 87, the internal circulation 88, or the custom servo rod 89. The second servo rod 64 drives the third gripper 62 to move and actuate the front defogger 85, the rear defogger 86, the hazard warning 87, the internal circulation 88, or the custom servo rod 89 to test the function, stroke, and actuation force. The second servo rod 64 is mounted below the third servo rod 65 via the third fixing plate 63. The third servo rod 65 can drive the second servo rod 64 to move laterally, so that the third gripper 62 sequentially acts on the front defrost knob 85, the rear defrost knob 86, the hazard warning knob 87, the recirculation knob 88, and the custom knob 89. After the test is completed, the rotating disk 11 rotates clockwise, driving the air conditioning panel 8 into the sixth test station 7.

[0056] Reference Figure 10The sixth testing station 7 includes a fifth cylinder 71, a pressing block 72, a fourth fixing plate 73, and a fourth servo rod 74. The pressing block 72 is fixedly installed at the end of the fifth cylinder 71 near the air conditioning panel 8. The fifth cylinder 71 drives the pressing block 72 to move downward, so that the pressing block 72 acts on the volume knob 82, the air conditioning knob 83, or the fan speed knob 84 to test the function, stroke, and pressing force value. The end of the fifth cylinder 71 away from the pressing block 72 is fixedly connected to the fourth fixing plate 73. The end of the fourth fixing plate 73 away from the fifth cylinder 71 is fixedly connected to the fourth servo rod 74. The fourth servo rod 74 can drive the fourth fixing plate 73 to move laterally, so that the pressing block 72 acts on the volume knob 82, the air conditioning knob 83, and the fan speed knob 84 in sequence to test the function, stroke, and pressing force value.

[0057] After the inspection is completed and the test is passed, the rotating disk 11 rotates clockwise, causing the air conditioner panel 8 to return to the first inspection station 2; the air conditioner panel 8 is then removed and the label printed by the linkage is affixed. If the test result is unqualified, the equipment will automatically identify and print a red label to identify the unqualified test item and provide a prompt.

[0058] The implementation principle of the air conditioner panel testing device disclosed in this application is as follows: Six testing stations are evenly arranged clockwise on the rotating disk 11. The first testing station 2 is used for picking up and placing the air conditioner panel 8; the second testing station 3 is used for backlight testing of the air conditioner panel 8; the third testing station 4 is used for testing the rotational torque and stroke of the volume knob 82, the air conditioning knob 83, and the fan speed knob 84; the fourth testing station 5 is used for testing the rotational torque and stroke of the driving mode selection knob 81; and the fifth testing station 6 is used for testing the front defroster. The functions, travel, and actuation force of the toggle knob 85, rear defogger knob 86, hazard warning knob 87, recirculation knob 88, and custom knob 89 are tested. The sixth testing station 7 is used to test the functions, travel, and actuation force of the sound knob 82, air conditioning knob 83, and fan speed knob 84. The six testing stations perform different tests on the air conditioning panel 8, effectively reducing the risk of missed tests and ensuring the final quality of the air conditioning panel 8. Furthermore, the six testing stations can work simultaneously, improving the efficiency of the air conditioning panel 8 testing and saving labor costs.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An air conditioner panel testing device, characterized in that, The system includes a main frame (1) and a rotating disk (11). The rotating disk (11) is horizontally mounted in the main frame (1). The rotating disk (11) is provided with a first detection station (2), a second detection station (3), a third detection station (4), a fourth detection station (5), a fifth detection station (6), and a sixth detection station (7) in sequence along the circumference. The first detection station (2) is used for picking up and placing the air conditioner panel (8). The second detection station (3) is used for backlight detection of the air conditioner panel (8). The third detection station (4) and the fourth detection station (5) are used to detect the function, rotation torque, and stroke of the knob of the air conditioner panel (8). The fifth detection station (6) is used to detect the function, stroke, and turning force value of the knob of the air conditioner panel (8). The sixth detection station (7) is used to detect the function, stroke, and pressing force value of the knob of the air conditioner panel (8). The air conditioner panel (8) is powered on during the detection.

2. The air conditioner panel testing device according to claim 1, characterized in that, The second detection station (3) includes a cover (31) and a darkroom (32). The darkroom (32) is slidably connected to the cover (31). The darkroom (32) slides down to cover the air conditioner panel (8) around its perimeter. A forward CCD lens (34) is fixedly installed in the cover (31). The forward CCD lens (34) is used to perform multiple backlight tests on the air conditioner panel (8).

3. The air conditioner panel testing device according to claim 2, characterized in that, The second inspection station (3) also includes a side CCD lens (35), which is fixedly mounted on the rotating disk (11) and is used to check the direction of the knobs on the air conditioning panel (8).

4. The air conditioner panel testing device according to claim 1, characterized in that, The third detection station (4) includes a second drive motor (41), a second cylinder (42), a first gripper (43), a first fixing plate (44), and a first servo rod (45). The second drive motor (41) is installed on the upper end of the second cylinder (42), and the first gripper (43) is fixedly installed on the lower end of the second cylinder (42). The second cylinder (42) drives the first gripper (43) to move downward and act on the knob. The second drive motor (41) is used to drive the first gripper (43) to rotate. The first fixing plate (44) is fixedly connected to the second cylinder (42) and the second drive motor (41) respectively. The second cylinder (42) is fixedly installed on the first servo rod (45), and the first servo rod (45) is used to drive the first gripper (43) to act on different knobs in sequence.

5. The air conditioner panel testing device according to claim 1, characterized in that, The fourth inspection station (5) includes a third drive motor (51), a third cylinder (52), a second gripper (53), and a second fixing plate (54). The third drive motor (51) is installed on the upper end of the third cylinder (52), and the second gripper (53) is fixedly connected to the lower end of the third cylinder (52). The third cylinder (52) drives the second gripper (53) to move downward and acts on the knob. The third drive motor (51) is used to drive the second gripper (53) to rotate. The second fixing plate (54) is fixedly connected to the third cylinder (52) and the third drive motor (51) respectively.

6. The air conditioner panel testing device according to claim 1, characterized in that, The fifth detection station (6) includes a fourth cylinder (61), a third gripper (62), a third fixing plate (63), a second servo rod (64), and a third servo rod (65). The third gripper (62) is fixedly connected to the lower end of the fourth cylinder (61). The fourth cylinder (61) drives the third gripper (62) to move downward and act on the dial. The fourth cylinder (61) is fixedly connected to the second servo rod (64). The second servo rod (64) is used to drive the fourth cylinder (61) to move towards the center of the rotating disk (11) to turn the dial. The second servo rod (64) is installed on the third servo rod (65) through the third fixing plate (63). The third servo rod (65) is used to drive the third gripper (62) to act on different dials in sequence.

7. The air conditioner panel testing device according to claim 1, characterized in that, The sixth detection station (7) includes a fifth cylinder (71), a pressing block (72), a fourth fixing plate (73), and a fourth servo rod (74). The fifth cylinder (71) is fixedly connected to the pressing block (72). The fifth cylinder (71) drives the pressing block (72) to move downward and act on the knob. The fifth cylinder (71) is fixedly connected to the fourth servo rod (74) through the fourth fixing plate (73). The fourth servo rod (74) is used to drive the pressing block (72) to act on different knobs in sequence.

8. The air conditioner panel testing device according to claim 1, characterized in that, The first detection station (2) is used to perform pin short circuit detection on the air conditioner panel (8).

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