The mirror select switch, which is a part of the drivers door switch assembly is placed in L or R to indicate the mirror to be moved. The drivers door switch assembly module (DDSA) receives the active high input from the mirror select switch and also receives an active high input from the mirror switch when the switch is actuated. The four mirror switch contacts are in the corners of the switch. The contacts are left-up, left-down, right-up, and right-down. When the mirror switch is actuated in a direct up, down, left, or right direction, the switch hits two of the contacts. The drivers door switch assembly (DDSA) recognizes the two contact input as a one direction input in the direction common to the two inputs. The DDSA then sends a message on the Serial Data Class 2 line to the driver door module (DDM) or passenger front door module (PFDM) depending on the position of the mirror select switch, indicating that the mirror needs to be moved. Each mirror has two reversible motors that the door modules control by supplying Battery Positive Voltage (B+) and ground to these motors.

The passenger front door module (PFDM) communicates with the powertrain control module (PCM) over the Serial Data Class 2 data line. When the gear selector is shifted to reverse the PCM will transmit the class 2 message to the PFDM. The PFDM will tilt the RH outside power mirror down 7 degrees. This allows the driver to see the curb while parallel parking.