Power Mirror Motor: Description and Operation

MIRROR MOTORS

Each mirror has two reversible mirror motors for position adjustment. These are the vertical motor and the horizontal motor. Each 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 the appropriate motor control circuits. The door module reverses the polarity of the voltage and ground it applies to the motor control circuits in order to move the motor in an opposite direction.

When the mirror is being operated in a direction that closes only one set of the mirror position switch contacts, i.e. Left-Up, Left-Down, Right-Up, or Right-Down, the associated door module applies voltage and ground to the appropriate circuits of both the vertical motor, and the horizontal motor to move the mirror in the two corresponding directions.

When the mirror is being operated in a direction that closes two sets of the mirror position switch contacts, i.e. Up, Down, Left, or Right, the door module applies voltage and ground to only that motor which controls movements in the direction common to both contacts. For example, if the mirror is being operated to a direct Up position, both the Left-Up and the Right-Up switch contacts are closed. The direction common to the contacts is the Up direction. Since the DDSA interprets that as a one direction command, the associated door module applies battery voltage and ground only to the vertical mirror motor to move the mirror UP.