Description

Windows- Front Description
The front windows are electrically operated from two rocker switches located in the center console. The front windows are controlled by the Body Control Unit (BCU) which limits the operation of the windows to when the ignition is in position II and for a period of 44 seconds after the ignition is switched off or after the driver's door is opened. The front window operation is suspended when the ignition switch is in the crank position III.

The front windows are powered by electric motors located in each front door. The window up/down functions are controlled by reversing the polarity to the motors. The BCU logic circuits have a stall detect function that monitors the current drawn by the window motor When the window contacts the top of the door frame or an obstruction the current drawn by the electric motor rises. If the BCU detects a sudden current rise the internal logic will remove the power supply to the front window motor.

The front windows have a one shot down function which operates if the switch is pressed for less than 0.4 seconds. Operation of the switch for more than 0.4 seconds operates the windows in inch down mode. The windows stop when the switch is released.

The front windows only operate in the inch up mode for as long as the switch is pressed The windows stop when the switch is released

Fault conditions related to the front windows can be retrieved from the BCU via the diagnostic socket using TestBook/T4

Windows - Front Supply

Circuit supply
A feed from the battery positive terminal is connected on an R wire to the engine compartment fusebox where it passes through fusible links 1, 5 and 8 and fuse 13. Fusible links 1 and 5 are connected in series.

A feed from fusible links 1 and 5 is connected from the fusebox on an NW wire to the passenger compartment fusebox, where it passes through fuse 34. From fuse 34, the feed is connected to pin C0664-7 of the BCU on an NG wire. This feed provides the power for the window lift motors.

A feed from fuse 13 is connected from the fusebox on a PN wire to pin C0660-13 of the BCU. This feed is the permanent battery supply to the BCU.

A feed from fusible link 8 is connected on an NW wire to the passenger compartment fusebox and from the fusebox to the ignition switch on an N wire.

Ignition switch supply
With the ignition switch in position II, the feed from fusible link 8 passes through the ignition switch to fuse 29 in the passenger compartment fusebox on a Y wire. From fuse 29 the feed is connected to pin C0660-1 of the BCU on a GU wire.