Description

Description

Power to the window wind circuits is available when the ignition switch is on and is supplied through a thermal cut-out to the left and right window switches. The switches are double pole plus earth so that the current through a window motor may be switched in either direction to raise or lower the window.

DB7 uses frameless door windows which seal against rubber strips around the body shell door opening. To avoid damaging these seals during door opening, the door glass must be lowered before the door can be opened. This function is controlled by the window control units. The units are mounted on the inside of each door frame and will sense if a door handle is pulled to open the door. Before releasing the door lock, the control unit will drive the window wind motor briefly to lower the door window glass down until it clears the window seals. Similarly, after closing a door, the window motor will be run to raise the door glass to seat the glass against the body seals.

Fault Analysis Procedure

1. If a window fails to operate, check for fuse failure and the connectors for poor or open contacts.
2. Check the thermal cut-out by shorting across it and operating either window. If the windows operate with the short circuit but not without, the cut-out is faulty.
3. With the ignition on, battery voltage should be available between the input terminals of the switches and chassis. Operate each switch and ensure that battery voltage is available between the switch output terminals and chassis.
4. Measure voltage from each switch input terminal to the switch earth return terminal. If no voltage is measured, the earth return line is open circuit.
5. Measure continuity through the wiring from the switches to each motor. If continuity is correct, remove the motor for bench testing.

6.7.04 Door Window Motor

Procedure

1. Remove the door trim panel and the glass inner sealing trim.



2. Position the window to gain access to the slider bracket and glass securing screws.
3. Disconnect the battery earth lead.
4. Remove two screws securing the glass to each of the two slider brackets. Loosen the two screws securing the glass to the elevator rail.
5. Slide the elevator rail forwards until the glass securing screws are opposite the wide opening of the rail keyhole slots and remove the glass from the top of the door.
6. Disconnect the window motor multiplex.