Power Locks: Description and Operation

The front door consists of the following components:
^ front door latch push button rod
^ exterior front door handle
^ front door latch
^ interior door handle
^ door lock actuator
^ door lock cylinder

The tailgate consists of the following components:
^ RH tailgate latch
^ tailgate cable
^ LH tailgate latch
^ tailgate latch remote control
^ tailgate handle
^ tailgate lock cylinder (optional)

Keyless Entry
The keyless entry system consists of the following components:
^ keyless entry remote transmitter
^ central security module
^ driver unlock relay
^ all unlock relay
^ all lock relay
^ keyless entry keypad

The keyless entry remote transmitter initiates the following electronic door lock system functions:
^ unlocks the driver door
^ unlocks all doors
^ locks all doors
^ enables the panic alarm
^ issues the interior lamps on (when unlocking) and off (when locking)
^ sounds the horn once when LOCK on keyless entry remote transmitter is pressed twice, and doors are closed
^ sounds the horn twice when LOCK on the keyless entry remote transmitter is pressed twice, and any door is ajar
^ allows up to four keyless entry remote transmitters to be programmed

NOTE: The remote entry features will not function when the ignition switch is in the RUN or START position.

The keyless entry remote transmitters are reprogrammable and must be set at the same time.

To confirm that the doors have been locked, press the LOCK button again, within three seconds of the first press. The horn will sound once if the doors have locked and all doors are closed.

To activate the panic alarm:
^ Press the red PANIC button on the keyless entry remote transmitter. The horn will sound and the parking lamps will flash for a maximum of 2 minutes and 45 seconds.

To deactivate the panic alarm:
^ Press the red PANIC button again on the keyless entry remote transmitter.
^ Turn the ignition switch to RUN/START.

The keyless entry keypad can be used to unlock the driver door or lock and unlock all the doors. It also lights the keypad lamp, allows one user code to be programmed and issues illuminated entry on/off requests to the GEM when locking and unlocking.

The system (permanent) entry code is located on the owner's wallet card in the glove box; it is also electronically accessible by using a diagnostic tool and is on the receiver assembly housing.

The receiver assembly is programmed at the factory with a five-digit entry code. A new receiver assembly includes a new owner's code card.

To turn on the interior lamps and light all illuminated components, press any button on the keyless entry keypad.

To unlock the driver door, enter the permanent factory code or enter the owner's alternate code. To unlock the passenger door(s), press the 3/4 button within five seconds of unlocking the driver door.

To lock all doors, press the 7/8 and 9/0 buttons at the same time. (It is not necessary to enter the key code first.) This will turn off the courtesy lamps.

If the autolock feature is enabled, the autolock feature will activate when the ignition switch is in the RUN or START position, the shift control selector is passed into or through the reverse (R) position and all doors are closed when the driver releases the brake pedal.

After the initial lock, all doors will automatically relock when any door is opened and then closed followed by the release of the brake pedal. However, the doors will not relock if the ignition switch is in the OFF position.

NOTE: The door ajar state will be monitored continuously for 500 ms after locking has occurred If a door is opened again within 500 ms, the driver door will unlock.

The door may not automatically lock if the vehicle is shifted quickly into gear after starting the engine.

Anti-Scan Feature
To provide added security, the keyless entry pad is disabled for one minute after 35 button presses without a valid code being entered. The keypad will flash during this one-minute mode with all functionality disabled except for 7/8 and 9/0 still being allowed to lock the vehicle.

Anti-Scan will be turned off after any of the following events:
^ one-minute of keypad inactivity
^ the key fob UNLOCK button is pressed
^ the ignition is turned to the ON position

Power Unlock Inhibit
With the ignition off, 20 seconds after electrically locked (key fob, keypad, door lock control switch locked with door ajar) and all doors are closed, the power door unlock switch will be inhibited if this feature is enabled. (The lock function will still operate.)

Deactivating/Activating Power Door Unlock Switch Inhibit
This is customer configurable. Steps one through three must be completed within 30 seconds.
1. Turn the ignition key to ON, then press UNLOCK three times.
2. Turn the ignition key to OFF, then press UNLOCK three times.
3. Turn the ignition key to ON, within five seconds press LOCK two times.

The user should receive two horn chirps to indicate the system has been disabled to two chirps followed by a horn honk to indicate the system has been enabled.

Pressing LOCK two times again will toggle the door lock control switch inhibit feature state.

Turn the ignition OFF to exit programming mode.

This feature can also be enabled/disabled using a diagnostic tool.

Autolock Enable/Disable - Using the Keypad
A manual enable/disable mode allows the autolock feature to be turned off and on.

To enable or disable autolock using the keyless entry keypad:
1. Enter the five-digit permanent entry code into the keyless entry keypad.
2. Within five seconds of entering the code, press and hold the 7/8 button on the keypad.
3. Within five seconds of Step 2, and while holding the 7/8 button, press the 3/4 button on the keypad and release it.
4. Within five seconds of Step 3, release the 7/8 button on the keypad.

If the autolock is disabled, the horn will chirp once. If the autolock feature is enabled, the horn will chirp once shortly and then sound a second time with a longer sound of the horn once the above sequence is completed.

Autolock Enable/Disable - Using the Ignition Switch
Another way to turn the autolock off/on is by following this series of steps:
1. Close all doors.
2. Confirm that the ignition switch is in the OFF position.
3. Turn the ignition switch from OFF to RUN.

NOTE: Steps 4 through 8 must be carried out within 30 seconds.

4. Press the power door lock UNLOCK button three times.
5. Turn the ignition switch from RUN to OFF.
6. Press the power door lock UNLOCK button three times.
7. Turn the ignition switch from OFF to RUN.
8. Verify that the horn chirps. This indicates the enable/disable mode and now is ready to accept program changes.
9. Press the power door lock UNLOCK button one time to command the module to toggle the autolock/relock feature OFF.
10. Press the power door lock LOCK button once to enter the command.
11. Verify that the horn chirps one time. There should only be one chirp indicating that autolock/relock feature has been disabled. If one chirp is heard, followed by a longer sound of the horn, the autolock/relock feature has just been enabled. Return to Step 10.
12. Turn the ignition switch to the OFF position to exit the enable/disable mode.
13. Exit the vehicle and verify that the horn chirps once to indicate that a feature has been changed and that autolock/relock has been disabled.