Functional Description

POWER DOOR LOCK SYSTEM
When the BCM receive an input for a lock/unlock request (door lock switch, RKE or door key cylinder switch (W/VTSS only), it will ground the appropriate relay for a specified amount of time. For this vehicle all door lock relays are located inside the body control module and are not serviced separately. The door lock switches provide a variable voltage (multiplexed (MUX) circuit) to the BCM and the BCM will respond to that command. If the conditions for door lock inhibit exist (key in ignition and left front door open), the BCM will not respond to a lock command.

Other power door lock features:
Automatic Door Locks - This feature can be enable/disabled by using either the DRB III(R) or customer key cycle method. When enabled, all the doors will lock when the vehicle reaches a speed greater than 15 MPH, all doors are closed and an increase of TPS signal is received by the PCM. If a door is opened and the vehicle slows to below 15 MPH, the door locks will operate again once all doors are closed and the vehicle speed accelerates above 15 MPH.

RKE (Remote Keyless Entry) - The body control module receives and decodes messages from the remote keyless entry transmitter. The remote key- less entry module is built into the BCM (premium) and is not serviced separately. The antenna for the RKE is located in the I/P harness and connects directly to the Body Control Module. When the lock button is pressed all doors will lock, horn will chirp (if programmed), courtesy lamps will turn off and VTSS (if equipped) will arm. If the lock button is pressed a second time, the headlamps will flash once as a visual response. When the unlock button is pressed once, the left front door will unlock, courtesy lamps will light (if equipped) W/illuminated entry) and VTSS (if equipped) will disarm. If the unlock button is pressed a second time (within five seconds of the first), the passenger door will unlock.panic mode is accomplished by pressing the panic button for one second. This flashes the lights and sounds the horn, but does not prevent the engine from running.

The BCM will ignore all commands from the transmitter if the vehicle speed is over 15 MPH. This allows the engine to be running during warm up on cold days and allows the RKE to be used to unlock the doors.

The RKE software can store up to four transmitter codes. Use the DRB III(R) to program transmitters.

Rolling Code - The rolling code feature changes part of the key fob (transmitter) message each time it is used. The key fob message and the receiver message increment together. Under certain conditions with a rolling code system (like pressing a button on the fob over 250 times outside of the receiver range) the receiver and transmitter can fall out of synchronization. To re-synchronize, press and hold the lock and decklid release buttons simultaneously for 5 seconds. Release the buttons and wait until the doors unlock. This may take as long as 6 minutes.