Power Door Lock Switch: Description and Operation

FRONT PASSENGER DOOR POWER LOCK SWITCH
For battery voltage and ground, the front passenger door power lock switch is wired to the front passenger door module. There are two circuits for battery voltage, one for a lock signal, and one for an unlock signal. The module supplies ground to the switch via a third circuit. When the switch is operated for a lock or unlock function, the normally open switch contacts for that function are closed to ground and voltage flows through the switch, providing the module with the appropriate signal input.

DRIVER DOOR POWER LOCK SWITCH
The driver door lock switch is similar to the front passenger door lock switch, however, for voltage it is wired to the driver door switch assembly (DDSA). The ground circuit is supplied by the driver door module (DDM). It also works the same way as the front passenger door lock switch, but the switch signal input information is detected and processed by the DDSA and less operating voltage is required. The DDSA has two circuits that supply 5 volts to the switch, one for a lock signal, and one for an unlock signal. When the switch is operated for a lock or unlock function, the normally open switch contacts for that function are closed to ground, the voltage flows through the switch and is detected by the DDSA. The DDSA then relays the switch information to the DDM via the class 2 serial data circuit.

REAR PASSENGER DOOR POWER LOCK SWITCHES
The rear door lock switches are similar to the front door lock switches. However, unless the vehicle is equipped with the V4U Limousine option, no circuits are provided for unlocking the doors from the rear door lock switches. For battery voltage and ground, the rear passenger door lock switches are wired to the rear passenger door modules. Only one circuit is provided to each switch for battery voltage, the lock signal circuit. There are no circuits provided to these switches for the unlock function. The rear door modules each supply ground to their respective switch via a ground circuit. When either switch is activated for a lock function, the normally open switch contacts for that function are closed to ground and voltage flows through the switch, providing the module with the appropriate lock signal input.