System Operation

In order to control outside rear view mirror adjustments, two switches are contained within the Driver Door Switch Assembly (DDSA). The DDSA contains a built in mirror select switch, and a built in mirror position switch. The DDSA is also wired to, and receives direct signal inputs, from the memory function switch. For power mirror operations, the DDSA reports the switch activity to the Driver Door Module (DDM) and the Passenger Front Door Module (PDM).

The mirror select switch is used to select which mirror, left or right, is to be moved.

The mirror position switch is used to move the mirror that has been selected for adjustment to the desired position. There are four contacts located in the switch, one in each corner. The contacts are designated as Left-Up, Left-Down, Right-Up, and Right-Down. When the switch is activated in a direct Up, Down, Left, or Right direction, the switch hits two of the contacts. The DDSA recognizes the two contact signal as a one direction signal in the direction common to the two signals. Depending on which mirror has been selected for adjustment, the DDSA then sends this information, via the class 2 serial data line, to the DDM or the PDM. The DDM or PDM then moves the applicable mirror to the requested position.