Power Lock Switch - Operation

OPERATION

The two-way, momentary, resistor multiplexed (MUX) power lock switches on the driver and passenger side front doors are connected in series between the door lock switch return and the right or left door lock switch mux inputs to the Totally Integrated Power Module (TIPM) located in the engine compartment. Each power lock switch rocker position (LOCK and UNLOCK) provides a unique input to the TIPM through the resistor trees within the switches which allows the TIPM to sense the switch position.

Based upon the power lock switch inputs, the TIPM controls the battery and ground outputs to the power lock motors to lock or unlock all of the door and swing gate latches. The Light-Emitting Diode (LED) in the rocker of the power lock switches is connected to battery current through a panel lamps dimmer circuit Pulse Width Modulated (PWM) output from the ElectroMechanical Instrument Cluster (EMIC); therefore, the switch will only be illuminated when the exterior lighting is turned ON and the illumination level will be synchronized with that of the other panel lamps dimmer controlled lamps in the vehicle.

The power lock switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.