Power Door Lock System

Power Door Locks
The power door locks are operated four different ways:

1. Front door lock Switches
2. Auto (rolling) door lock feature (vehicle speed above 15 MPH and all doors closed).
3. Auto unlock on exit (vehicle stopped after auto door locks had locked the doors transmission in neutral or park and the drivers door is opened all doors will unlock).
4. Remote Keyless Entry (RKE)

Door Lock Inhibit
When the key is in the ignition and in the OFF position and either front door is opened the lock switch on that door is disabled. The unlock switch is still functional. This protects against locking the vehicle with the keys still in the ignition. For example if the driver's door is opened and the passenger front door closed the locks are operational from the passenger door switch.

Remote Keyless Entry
When the lock button on the transmitter is pressed all locks will lock illuminated entry will be turned OFF (providing all doors are closed) and the vehicle theft security system (if equipped) will be armed. When the unlock button on the transmitter is pressed one time the driver front door will unlock the illuminated entry will turn ON the courtesy lamps the vehicle theft security system (if equipped) will be disarmed. When the button is pressed a second time the other doors will unlock. This feature is programmable to open all doors on one press using the EVIC or the DRB III.

The passenger door module (PDM) contains the RKE receiver. When the PDM receives a valid signal from the RKE transmitter it will send a signal on the PCI bus to lock or unlock the doors. The RKE transmitter used radio frequency signals to communicate with the RKE receiver. If vehicle is equipped with the memory system the memory message will be received as to which transmitter sent the signal (1 or 2).

Panic Function
When the panic button on the RKE transmitter is pressed it pulsates the headlamp hazard lamps and horn relays and actuates the courtesy lamp relay. By pressing the button again the horn and exterior lamps will stop but the courtesy lamps will remain ON until the BCM times them out or the ignition is turned ON. The panic feature is able to be set if the ignition is ON but only if the panic button is pressed prior to the vehicle being started it will continue for three minutes or until the vehicle has reached a speed of 15 MPH if not canceled by the operator.

Actuating the headlamp horn hazard lamps and courtesy lamp relays with the DRB III will verify that the circuits and the body control module are OK. If the panic feature is still inoperable with both transmitters replacement of the passenger door module will be necessary. If the function is inoperable with just one transmitter then it is obvious that the transmitter must be replaced.

Rolling Code
The rolling code feature changes part of the transmitter message each time that it is used. The transmitter message and the receiver message increment together. Under certain conditions with a rolling code system (pressing a button on the RKE transmitter over 255 times outside the receiver range) the receiver and transmitter can fall out of synchronization. By pressing specific buttons together the system will re-synchronize. This is accomplished by pressing and holding both the lock and unlock buttons simultaneously for 5 seconds. Release the buttons and wait until the doors unlock indicating that the code has been synchronized. This may require waiting for as long as 6 minutes.

Programmable Door Lock Features
- The RKE can be changed to unlock all doors with one press
- The Automatic Door Locks can be enabled/disabled
- Auto Unlock on Exit can be enabled/disabled
- RKE horn chirp on lock can be enabled/disabled
- RKE optical chirp (turn signal lamps) can be enabled/disabled
- Program a new RKE transmitter (DRB III only)
- RKE linked to memory (if equipped with memory system) enabled/disabled (DRB III only). Allows memory to be operable only from the driver door switch.