Basic Principles

Take the left window as example to illustrate the working principle of power window circuit,as shown in Fig.3.2.

Fig.3.2 Circuit Diagram of Left Front Power Window Electric

BCM receives the signals from each switch button and after judging and processing,output the signal to control the motor.(https://www.daowen.com)

Pin A10 of BCM is power source of front window and pin 4 is grounded G103.

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 then pin A03 of BCM provides the rising power source of the left front door power window motor for pin 1 of the left front door power window motor.

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 pin A02 of BCM provides the descending power source of the left front door power window motor for pin 2 of the left front door power window motor.