Power Lock Switch Explanation

POWER LOCK SWITCH DESCRIPTION
The power lock system can be controlled from within the passenger compartment of the vehicle by a
two-way, momentary, resistor multiplexed, single gang switch (Fig 1) #1 secured within a switch mounting bezel located near the front of each front door inside trim panel. The power lock switch is secured to the back of the mounting bezel by two screws through two mounting tabs (Fig 1) #3 integral to the switch housing so that only the switch rocker (Fig 1) #4 is visible where it protrudes through the bezel.

The power lock switch mounting bezel is secured by two integral engagement tabs at the bottom and two small metal snap clips at the top within an opening near the forward end of each front door inside trim panel so that the switches can be serviced without removing the trim panel. An integral connector receptacle (Fig 1) #2 on the back of the switch housing connects the switch to the vehicle electrical system through a dedicated take out and connector of the front door wire harness.

The power lock switch rocker has a slightly convex knurled pad on the forward LOCK end, and a slightly concave smooth pad on the rearward UNLOCK end to allow tactile identification of the switch functions. There are also white International Control and Display Symbol graphics applied to the switch mounting bezel at each end of the switch rocker, which provide a clear visual identification of the switch functions. A blue-green Light-Emitting Diode (LED) (Fig 1) #5 located within the UNLOCK end of the switch rocker provides improved switch visibility whenever the exterior lighting is turned ON.
The power lock switches cannot be adjusted or repaired and, if faulty or damaged, the entire switch unit must be replaced. The driver side and passenger side switches are interchangeable. The switch mounting bezels are unique for the driver and passenger sides of the vehicle and are available for separate service replacement.

POWER LOCK SWITCH 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 Electro Mechanical 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.


POWER LOCK SWITCH REMOVAL
1. Disconnect and isolate the battery negative cable.
2. Using a trim stick or another suitable wide flat-bladed tool, carefully pry between the front door inside trim panel (Fig 2) #1 and the top edge of the power lock switch mounting bezel (Fig 2) #2 to disengage the two snap clips from the opening in the trim panel.
3. Pull the mounting bezel and power lock switch (Fig 2) #3 unit away from the trim panel far enough to access and disconnect the door wire harness connector from the switch connector receptacle.
4. Remove the two screws (Fig 3) #4 that secure the power lock switch (3) to the back side of the mounting bezel (Fig 3) #1.
5. Remove the switch from the bezel.

POWER LOCK SWITCH INSTALLATION
NOTE: The power lock switch can be installed two ways in the mounting bezel to accommodate use on either the driver side or the passenger side of the vehicle. Be certain that the switch is oriented so that the knurled convex or LOCK end of the switch rocker is nearest the LOCK icon on the forward end of the bezel face.

1. Position the power lock switch (Fig 3) #3 to the back side of the mounting bezel #1.
2. Install and tighten the two screws (Fig 3) #4 that secure the switch to the bezel. Tighten the screws securely.
3. Position the mounting bezel and power lock switch unit close enough to the opening in the inside door trim panel to access and reconnect the door wire harness connector to the switch connector receptacle.
4. Position the two engagement tabs (Fig 3) #5 of the mounting bezel over the lower edge of the opening in the inside door trim panel.
5. Use hand pressure to press the bezel firmly and evenly into the top of the trim panel opening far enough to engage the two snap clips (Fig 3) #2 through the upper edge of the opening.
6. Reconnect the battery negative cable.