Power Door Locks
The BCM controls the door locks by sending messages over the CAN to the DDM and the PDM. The DDM and the PDM each relay the message over a LIN to the Driver Rear Door Module (DRDM) and the Passenger Rear Door Module (PRDM) respectively. Each door module supplies power and ground to its corresponding door lock actuator (integrated into the door latch). The modules reverse the polarity to switch between the lock and unlock functions.
For vehicles equipped with rear cargo doors, the BCM controls the rear cargo door lock by using a series of 2 integral relays. When the relays are not energized, ground is provided on both circuits to the lock motor within the latch. When the unlock relay energizes, voltage is provided to one side of the lock motor to unlock the rear cargo door. When the lock relay energizes, the polarity is reversed and the motor locks the door.
The BCM sends voltage signals to the door lock control switches. When a door lock control switch is pressed, the voltage signal is routed to ground, indicating a request to lock or unlock the doors.
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 DDM detects the lock/unlock feedback input change state and sends a message to the BCM indicating the lock/unlock status of the driver door. The BCM correspondingly sends a command over the network to the DDM and the PDM to lock or unlock the doors.
In the event of a failure of the power door locks, the doors can be individually locked using 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 left side of the vehicle, insert a key and turn the key clockwise to lock. For the doors on the right side of the vehicle (or the rear cargo door if equipped), insert a key and turn the key counterclockwise to lock.
Based upon input from the door lock control switches, the lock/unlock feedback input and the RKE transmitter, the BCM unlocks the driver door, unlocks all the doors or locks all the doors.
Based upon input from the door lock control switches, the lock/unlock feedback switches and the RKE transmitter, the BCM commands the door to lock or unlock.
Door Lock Indicator
Each door module monitors the door lock/unlock status by sending a voltage signal to its corresponding lock/unlock feedback switch inside each door latch. The switch is closed when the door is unlocked and open when locked. The rear door modules send the information to the corresponding front door modules. The front door modules then transmit the door lock/unlock status to the BCM.
For vehicles equipped with rear cargo doors, the BCM monitors the rear cargo door lock/unlock status by sending a voltage signal to the lock/unlock feedback switch inside door latch. The switch is closed when the door is unlocked and open when locked.
The BCM uses the input from the lock/unlock feedback to determine if the indicator should be illuminated or off. The BCM controls the voltage to the door lock indicator.
If all the doors are locked and the liftgate (if equipped) are closed, the indicator is illuminated. If any door is unlocked or the liftgate is open, the indicator is off. If the ignition is off when all the doors are locked and the liftgate (if equipped) is closed, the indicator turns off after approximately 5 minutes have elapsed.
Reverse Door Lock Cycling
The reverse door lock cycling feature provides audible feedback by unlocking the doors if one of the front doors or the rear cargo door is ajar after receiving a lock request.
The BCM also activates the reverse door lock cycling feature if a short to ground (stuck closed switch) fault is present from any of the unlock feedback circuits.
The rear door reverse lock cycling for the rear door can only be enabled or disabled using a diagnostic scan tool. Vehicles come from the factory with this feature enabled.
Liftgate Release
The liftgate release system is inhibited when the vehicle speed exceeds 7 km/h (4.3 mph). The liftgate release system is also inhibited from the release switch when the vehicle doors are locked.
If the liftgate release button on a RKE transmitter is pressed once, the liftgate releases when the release switch (located on the liftgate) is pressed within 45 seconds.
When the liftgate release system is not inhibited, the liftgate latch can be released from the liftgate release switch.
The BCM sends a voltage signal to the liftgate release switch. When the liftgate release switch is pressed, the signal is routed to ground, pulling the signal low and indicating a request to release the liftgate latch.
When the BCM receives a valid request to release the liftgate latch, the BCM supplies voltage to the latch. The liftgate latch then actuates to release the liftgate.
RKE
The RKE system uses an Integrated Keyhead Transmitter (IKT). The Integrated Keyhead Transmitter (IKT) incorporates both the PATS and the RKE transmitter functions in a single device.
In addition to the Integrated Keyhead Transmitter (IKT), conventional RKE transmitters (key fobs) can be programmed to the vehicle. The RKE transmitters can be used to:
- unlock the doors (configurable).
- lock all the doors.
- release the liftgate latch.
- arm/disarm the perimeter alarm (if equipped).
- activate/deactivate the panic alarm.
- provide a visual confirmation when the unlock button is pressed (a long flash of the turn signals).
- provide an audible confirmation when the lock button is pressed twice within 3 seconds with all the doors closed (sounds the horn once).
- provide an audible confirmation when the lock button is pressed twice within 3 seconds and any door is ajar or a door is not locked (sounds the horn twice).
The RKE transmitters have a normal operating range of 20 m (65.62 ft).
The RKE feature is controlled by the BCM. When a button is pressed on a RKE transmitter, the Transmitter Identification Code (TIC) and the RKE command are received by the internal BCM antenna. If the BCM detects a valid programmed RKE transmitter, the BCM carries out the command by activating the power door locks, releasing the liftgate latch or activating the horn or turn signals as required.
RKE Transmitter Lock
The RKE feature requests all of the doors 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 once. If the hood, the liftgate or any door is ajar, no flash occurs. As soon as all the openings are 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 the hood, the liftgate and all of the doors are closed and locked. If the hood, the liftgate or any door is ajar or does not lock when the second lock request is received within 3 seconds of the first, the RKE transmitter feature chirps the horn twice without flashing the turn signals to indicate it locked all of the doors but the hood, the liftgate or a door is ajar or did not lock. When the ignition is on, the turn signal flashes and horn chirp confirmations do not occur.
RKE Transmitter Unlock (without cargo protect)
The RKE feature provides a staged (if enabled) process for unlocking the doors. Upon receipt of the first request for unlocking the doors, the RKE control feature unlocks only the front driver and passenger doors and provides a long flash of the turn signals. If another unlock request is received within 3 seconds of the first, all the doors are unlocked. This feature can be disabled so all the doors unlock on the first press of the unlock button.
RKE Transmitter Unlock (with cargo protect)
The RKE feature provides a staged (if enabled) process for unlocking the doors. Upon receipt for unlocking the doors, the RKE control feature provides a long flash of the turn signals and unlocks specific doors based on configuration. The configuration can only be changed using a diagnostic scan tool (Module Programming > Programmable Parameter > Power Door Locks).
The RKE transmitter unlock configuration are as follows:
| RKE Transmitter Button | Configuration Setting | First Press | Second Press Within 3 Seconds |
|---|---|---|---|
| General Unlock Setting | |||
| Unlock button | Default | Unlock the front driver, front passenger and the sliding door(s) | Unlock all the doors |
| Unlock button | Unlock Cabin | Unlock the front driver and front passenger doors | Unlock all the doors |
| Unlock button | Unlock Cabin and Sliding Doors | Unlock the front driver, front passenger and the sliding door(s) | Unlock all the doors |
| Unlock button | Unlock Cabin and Rear Door | Unlock the front driver, front passenger and rear cargo doors | Unlock all the doors |
| Cargo Unlock Setting (vehicles with rear cargo doors) | |||
| Luggage compartment button | Default | Unlock the rear cargo doors | Unlock all the doors |
| Luggage compartment button | Unlock Sliding Door and Rear Door | Unlock the sliding door(s) | Unlock all the doors |
| Luggage compartment button | Unlock Sliding Door | Unlock the rear cargo doors | Unlock all the doors |
| Luggage compartment button | Unlock Rear Door | Unlock the sliding and rear cargo doors | Unlock all the doors |
| Cargo Unlock Setting (vehicles with a liftgate) | |||
| Luggage compartment button | Default | Allow the liftgate latch to release if the liftgate release button on the liftgate is pressed within 45 seconds | Release the liftgate latch and unlock all the doors |
| Luggage compartment button | Unlock Sliding Door and Rear Door | Unlock the sliding door(s) and allow the liftgate latch to releases if the liftgate release button on the liftgate is pressed within 45 seconds | Release the liftgate latch and unlock all the doors |
| Luggage compartment button | Unlock Sliding Door | Unlock the sliding door(s) | Release the liftgate latch and unlock all the doors |
| Luggage compartment button | Unlock Rear Door | No action (liftgate latch releases if the liftgate release button on the liftgate is pressed within 45 seconds) | Release the liftgate latch and unlock all the doors |
RKE Transmitter