Mirror Motors

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Each mirror has two reversible motors for position adjustment; the vertical motor and the horizontal motor. Each reversible mirror motor is wired to its associated door module through two motor control circuits. The door modules control the reversible motors by applying battery voltage and ground to these two motor control circuits. The door module reverses the polarity of the voltage and ground it applies to these two circuits in order to run the mirror motor in opposite directions. For example, to run the mirror in the Up direction, the door module applies voltage to the mirror motor up control circuit, and ground to the mirror motor down control circuit. To run the mirror in the opposite Down direction, the module reverses the polarity, supplying voltage to the down control circuit, and ground to the up control circuit.

When the mirror is operated in a Left-Up, Left-Down, Right-Up, or Right-Down direction, the associated door module applies voltage and ground to the appropriate control circuits of both the vertical motor, and the horizontal motor to move the mirror in both corresponding directions.

When the mirror is operated in a direct Up, Down, Left, or Right direction, the associated door module applies voltage and ground to only that motor which controls movements in the one corresponding direction. For example, if the switch is operated to a direct Up position, the associated door module applies voltage and ground only to the appropriate control circuits of its vertical motor.