Windows: Description and Operation

Circuit Description
A permanent magnet motor operates each of the power windows. Each motor raises or lowers the glass when voltage is supplied to it. The direction the motor turns depends on the polarity of the supply voltage.

The power window main switch in the driver module controls the operation of all the power window motors. Each power window switch controls it's own power window motor and has two opposite relays controlled by ETACM or door modules. If the power window lock switch is depressed(LOCK), the passenger power windows(assister door window, rear left/right door window) can not be controlled by their own window switches. However, they can still be controlled by the power window main switch.

Power Window Main Switch Operation
Battery voltage is applied at all times to both the coil and contact of the power window relay.

The coil of the power window relay is energized when the ETACM supply ground to the coil.

Battery voltage is then supplied to power window main switch through the closed power window relay contacts. When any of the switches in the power window main switch are operated, the ETACM or driver/assister door module controls the appropriate up/down relay coils. Each of the power window motor is grounded through the opposite relay contacts in the passenger power window switches. The power window motor runs to drive the window.

Passenger Power Window Switch Operation
With the power window relay coil energized, battery voltage is also supplied to the passenger window switches as long as the lock switch in the power window main switch is OFF (UNLOCK). When each of the passenger window switches is operated, battery voltage is applied to one terminal of the power window motor. The other terminal is grounded through the opposite relay contact in the window switch. The power window motor runs to drive the window.