Window Switch Operation

When any driver's door power window switch is pressed, a Simple Bus Interface (SBI) serial digital message is transmitted from the front power window switch to the driver door module.

If either the passenger or the rear window switches are pressed, an SBI message, relating the switch operation, is transmitted from the driver's door module to either the passenger's door module or the Rear Door Modules (LRDM), (RRDM) as appropriate. All of the window motors are directly controlled by their respective door modules.

If the driver's window switch is pressed, the driver door module will apply battery voltage of the correct polarity directly to the left front window motor, driving the window up or down.

Each window motor is protected by an electronic circuit breaker. If a window switch is held too long with the window obstructed or after the window is fully up or down, the circuit breaker opens the circuit. The circuit breakers have Positive Temperature Coefficients (PTC) and reset automatically when voltage is removed from the motors.