System Operation

Handles, Locks, Latches and Entry Systems - with Door Modules (with Window One-touch Up), without Intelligent Access (IA)

System Operation

System Diagram





Network Message Chart

Module Network Input Messages - BCM (Body Control Module)





Module Network Input Messages - DDM (Driver Door Module)





Module Network Input Messages - PDM (Passenger Door Module)






Power Door Locks

The BCM (Body Control Module) monitors the door lock control switch. When the BCM (Body Control Module) receives a lock/unlock command from the door lock control switch, the BCM (Body Control Module) sends a lock/unlock command message to the DDM (Driver Door Module) and the PDM (Passenger Door Module) over the MS-CAN (Medium Speed Controller Area Network). When the DDM (Driver Door Module) and PDM (Passenger Door Module) receive the lock/unlock command, they send the lock/unlock request to the DRDM (Driver Rear Door Module) and PRDM (Passenger Rear Door Module) over the corresponding LIN (Local Interconnect Network). Each door module then supplies power and ground to the corresponding door lock actuator to unlock or lock the door.

Each door module monitors the door lock/unlock status by sending a voltage signal to the lock/unlock feedback switch inside each of the 4 door latches. The switches are closed when the door is unlocked and open when locked. The rear door modules transmit the lock/unlock data to the corresponding front door module. The front door modules in turn transmit the data to the BCM (Body Control Module). The BCM (Body Control Module) uses this input to determine if the indicator should be illuminated or off. The BCM (Body Control Module) controls the voltage to the door lock indicator.

If all 4 doors are locked, the indicator is illuminated. If any door is unlocked, the indicator is off.

If the BCM (Body Control Module) detects any door unlocked when the door lock control button is pressed, the doors lock. If the BCM (Body Control Module) detects all the doors locked when the door lock control button is pressed, the doors unlock.

The doors can also be centrally locked or unlocked using a key in the driver door lock cylinder. When a key is used in the driver door lock cylinder to lock or unlock the driver door, the BCM (Body Control Module) detects the lock/unlock feedback input change state and correspondingly locks or unlocks all the other doors.

In the event of a failure of the power door locks, the doors can be individually locked through the manual door lock. The manual door lock is located on the rear edge of the door just above the door latch opening. For the doors on the driver side of the vehicle, insert a key and turn the key clockwise to lock. For the doors on the passenger side of the vehicle, insert a key and turn the key counterclockwise to lock.

Liftgate or Luggage Compartment Lid Release

The liftgate or luggage compartment lid release system is inhibited when the vehicle speed exceeds 7 km/h (4.3 mph). The liftgate or luggage compartment lid release system is also inhibited from the release switch when the vehicle doors are locked. If the liftgate or luggage compartment lid release switch on a RKE (Remote Keyless Entry) transmitter is pressed one time, the liftgate or luggage compartment lid will release when the release switch located on the liftgate or luggage compartment lid is pressed within 45 seconds. The liftgate or luggage compartment lid latch releases the liftgate or luggage compartment lid when the release switch on the liftgate or luggage compartment lid or on the RKE (Remote Keyless Entry) transmitter is pressed. The button on a RKE (Remote Keyless Entry) transmitter has to be pressed twice within 3 seconds. When the BCM (Body Control Module) receives a signal to release the liftgate or luggage compartment lid, the BCM (Body Control Module) supplies voltage to the latch. The liftgate or luggage compartment lid latch then actuates to release the liftgate or luggage compartment lid.

Autolock

The autolock feature (when enabled) locks all the doors when:
- all the doors are closed.
- the ignition is in the RUN position.
- the vehicle is shifted into any gear.
- the vehicle reaches a speed greater than 7 km/h (4.3 mph).
The autolock feature repeats when:
- any door is opened then closed with the ignition in the RUN position.
- the vehicle reaches a speed greater than 7 km/h (4.3 mph).
The autolock feature can be enabled or disabled. REFER to Autolock Programming Autolock Programming.

Auto-Unlock

NOTE: The doors will not auto-unlock if the vehicle has been electronically locked before the driver door is unlocked.

The auto-unlock feature unlocks all of the doors when the driver door is unlocked.

The auto-unlock feature can be enabled/disabled. REFER to Auto-Unlock Programming Auto-Unlock Programming.

Smart Unlock

The smart unlock feature prevents the doors from electronically locking with the key in the ignition lock cylinder. When the BCM (Body Control Module) receives a lock command from the door lock control switch, and the key is in the ignition lock cylinder with one of the front doors open, the BCM (Body Control Module) commands the doors to unlock. To override the smart unlock feature and intentionally lock the doors with the key in the ignition, close all doors and lock the vehicle by pressing the lock button on another RKE (Remote Keyless Entry) transmitter or with another key in the driver door lock cylinder.

Remote Keyless Entry (RKE)

The RKE (Remote Keyless Entry) system uses an IKT (Integrated Keyhead Transmitter). The IKT (Integrated Keyhead Transmitter) incorporates both the PATS (Passive Anti-Theft System) and the RKE (Remote Keyless Entry) transmitter functions in a single device. REFER to Integrated Keyhead Transmitter (IKT) .

The RKE (Remote Keyless Entry) transmitters initiate the electronic system functions:
- Unlocks the driver door
- Unlocks all doors
- Locks all doors
- Releases the liftgate or luggage compartment lid latch
- Arms/disarms the perimeter alarm (if equipped)
- Activates/deactivates the panic alarm
- Commands the interior lamps on (when unlocking) and off (when locking)
- Provides a long flash of the turn signals when UNLOCK is pressed
- Flashes the turn signals once when LOCK is pressed and all the doors are closed. If LOCK is pressed again within 3 seconds, the horn sounds once and the turn signals flash
- Sounds the horn twice when LOCK is pressed twice within 3 seconds, and any door is ajar or a door does not lock
The RKE (Remote Keyless Entry) transmitters have a normal operating range of 20 m (65.62 ft).

RKE (Remote Keyless Entry) Unlock Control

The RKE (Remote Keyless Entry) feature provides a stepped (if enabled) process for unlocking the doors. Upon receipt of the first request for unlocking the doors, the RKE (Remote Keyless Entry) control feature unlocks the driver door only and provides a long flash of the turn signals. If another unlock request is received within 3 seconds of the first, the RKE (Remote Keyless Entry) feature unlocks all the doors. This feature can be disabled so that all the doors unlock on the first press of the unlock button. REFER to Stepped Unlock Programming Stepped Unlock Programming.

RKE (Remote Keyless Entry) Lock Control

The RKE (Remote Keyless Entry) feature requests that all of the doors be locked when the lock button is pressed. On any press of the lock button with all doors closed, the doors lock and the turn signals flash one time. If any door or liftgate/luggage compartment lid is ajar, no flash occurs. As soon as the last door or liftgate/luggage compartment lid is closed, the turn signals flash. If 2 presses of the lock button are received within 3 seconds, the horn chirps once and the turn signals flash to indicate that all of the doors and liftgate are closed and locked. If any door is ajar or does not lock when the second lock request is received within 3 seconds of the first, the RKE (Remote Keyless Entry) transmitter feature chirps the horn twice without flashing the turn signals to indicate it locked all of the doors but one or more doors or the liftgate/luggage compartment lid is ajar or did not lock. When the ignition is in the RUN or START position, the turn signal flashes and horn chirp confirmations do not occur.

Panic Alarm

The panic alarm feature provides audible and visual alarms, which are evident from the exterior of the vehicle. The panic alarm feature requests that the turn signals flash and the horn sounds until deactivation. The flashing of the outputs occurs simultaneously. Activation of the panic alarm is accomplished by pressing the panic button twice or by pressing and holding for 3 seconds on a RKE (Remote Keyless Entry) transmitter whenever the key is in the OFF position. At all other times this feature is disabled. Deactivation of an active panic alarm is accomplished by:

- a second press of the RKE (Remote Keyless Entry) transmitter panic button.

- the ignition is switched out of the OFF position.

- a period of 2 minutes and 45 seconds has elapsed since the initial activation.

The panic alarm cannot be deactivated during the first 5 seconds of activation to avoid unintentional deactivation.