Inspection Methods
1)Inspection of Light Switch
The terminal and terminal conduction of light switch are shown is Fig.3.11 and 3.12.
Fig.3.11 Light Switch Terminal
Fig.3.12 Light Switch Terminal Conduction
Take turn light for example,and check the conductive condition of terminal according t o the following steps.
（1）Turn the switch to the gear of turn right,and use the universal meter to check whether pin 9 and 11 of switch connector are conducted or not.If yes,it means it’s normal.(https://www.daowen.com)
（2）Turn the switch to the gear of turn left,and use the universal meter to check whether pin 9 and 10 of switch connector are conducted or not.If yes,it means it’s normal.
2.BCM Signal Inspection
Take turn light for example:
（1）When turning to right,pin C07 of BCM will receive the signal from the low beam light switch and use the universal meter to measure the voltage of that pin and the result should be 0 V.The output voltage of BCM pin B12 should be 12 V.Pin positions are shown in Fig.3.13.
Fig.3.13 Positions of Pin B05,B12,C07 and C27
（2）When turning to left,pin C27 of BCM will receive the signal from the high beam light switch and use the universal meter to measure the voltage of that pin and the result should be 0V.The output voltage of BCM pin B05 should be 12 V.