Power windows – circuit operation

POWER WINDOWS – CIRCUIT OPERATION

CIRCUIT OPERATION

Dred 0 the Window Lit £0U (219) rom ses F1 and F2. The Window Lift ECU is grounded through the B wire at ground E201

Timeout Feature

Fuse F15 applies voltage to the Window Lift ECU terminal 3 when the ignition switch is on. When the ignition switch is turned off, the absence of voltage at terminal 3 signals the Window Lift ECU to start the timeout feature. When the timeout feature is activated, the Window Lift ECU will allow window and sunroof operation for an additional 45 seconds.

The timeout feature will be cancelled if the driver's door is opened and then closed. The Window Lift ECU monitors the door’s position at terminal 9.

Front Window Operation When a Front Window Switch is operated, the switch grounds one of four Window Lift ECU input terminals. This signals the Window Lift ECU to apply voltage and ground to the respective window motor. If the front window switch is held in the down position for more than 1/2 second, the express down feature is activated. The Window Lift ECU will operate the window motor until it is completely lowered.

Rear Window

The Window Lift ECU terminal 4 supplies voltage to the Rear Window Console and door switches for rear window operation.

When a window console switch is in the ‘DOWN’ position, voltage is applied to the window motor through the ‘up’ switch contacts. The window motors operate because they are grounded through the ‘down’ contacts of the window console switch. When a switch is in the ‘UP’ position, the polarity applied to the window motor is reversed, causing the motor to run in the opposite direction and the window to close.

Rear Window Isolation Switch (X187) The Rear Window Isolation Switch (X187) is placed in series with the ground supply to the Rear Window Door Switches (X188, X189). If the isolation switch is opened, the ground supply is interrupted, preventing rear window operation using the rear door switches.

CIRCUIT OPERATION 1