Door Switch: Description and Operation

DRIVER DOOR SWITCH ASSEMBLY (DDSA)

The driver door switch assembly (DDSA) contains the power window switch for the driver door window and a power window switch for each one of the passenger door windows. These switches differ from the individual power window switches mounted locally to the passenger doors in that, there are no external circuits. The DDSA is wired to the driver door module (DDM) for battery voltage, ground, and class 2 serial data. The DDSA supplies battery voltage to one side of the contacts of each of the integral window switches, and ground to the other side of the contacts. When a DDSA power window switch is operated, the contacts for that switch are closed to ground and the DDSA interprets the switch signal. The DDSA then sends the appropriate request message, via the class 2 serial data link, to the appropriate door module to operate the associated window.