Test Methods
1)Switch Inspection
The circuit principles of main window switch and the pin terminal are shown in Fig.3.3.
Fig.3.3 The Main Switch Joint-plug-part and Pin No.
Rising of front left window:Resistance between pin 10 and 4 of driver side main window switch joint-plug-part is 1.2 kΩ.
Descending of front left window:Resistance between pin 10 and 4 of driver side main window switch joint-plug-part is 0 kΩ.
One Press to Descend:The resistance between pin 9 and 4 of main power window switch connector is 0 Ω.(https://www.daowen.com)
Only when pin No.2 is electrified,lock switch works.At this moment,press the lock switch,pin 1 and 4 are connected,and the voltage is 0V.Releasing the lock switch makes pin 1 and 4 unconnected.
2)BCM Signal Inspection
When pressing the left front window button to rise,pin C02 of BCM receives the rising signal from the left front door power window switch and at this moment,use the universal meter to measure the voltage of the pin,which is 2.24V,and the voltage of BCM pin A03 is 12 V.Pin positions are shown in Fig.3.4.
Fig.3.4 Positions of Pin C02,A2 and A3
When pressing the left front window button to descend,pin C02 of BCM receives the descending signal from the left front door power window switch and then use the universal meter to measure the voltage of the pin,which is 0V,and the voltage of BCM pin A02 is 12 V.