GM Service Manual Online
For 1990-2009 cars only

Each exterior mirror assembly has two reversible motors: one to tilt the mirror face up and down (vertical position) and one to tilt the mirror face left and right (horizontal position). The exterior rear-view mirrors are adjusted electrically from inside the vehicle using the mirror control switch, which is mounted in the driver door pull-handle. Replacement exterior rear-view mirror assemblies are available in Black or with a Satin-silver contrast. These are made of acrylate styrene acrylonitrile (ASA) plastic. Replacement assemblies requiring a color-coded contrast need to be masked and painted using correct refinishing procedures as outlined by the paint manufacturer.

The exterior-mirror control switch has two controls: a slide-select switch (with left mirror and right mirror positions) and a directional toggle switch to control the direction of adjustment. The directional toggle switch is designed to operate in only one direction at a time and is activated by pressing the edge of the toggle in the required direction. The exterior-mirror control switch is operational when the ignition is on.

Tilt Downwards

When the toggle switch is set to activate the vertical position motor to tilt the mirror downwards, the following circuit is activated: Battery voltage is supplied to the toggle switch contacts via fuse F15. This voltage is applied to one side of the vertical position motor. The circuit is completed on the other side of the vertical position motor, to ground. This activates the vertical position motor until the directional toggle switch is released.

Tilt Upwards

When the toggle switch is pressed to move the mirror UPWARDS, it switches the circuit so that voltage is applied to the same motor, but in the opposite direction. That is, from fuse F15 to the toggle switch then through the select switch contacts and to the motor. The path to ground is now via the toggle switch contacts to ground.

Tilt Outwards

When the directional switch is pressed in the OUTWARD position, the circuit activates as follows: Battery voltage from fuse F15 is supplied through the directional contacts of the toggle switch to one side of the horizontal mirror motor. The mirror horizontal position motor has a path to ground through the side select switch contacts and the directional contacts. This energizes the mirror horizontal motor to tilt the mirror OUTWARDS until the toggle switch is released.

Tilt Inwards

When the directional toggle switch is pressed to tilt the mirror INWARDS, voltage is supplied to the mirror horizontal motor in the opposite direction. Power to the motor is supplied through the directional and side select switch contacts. The motor is grounded via the directional switch contacts.