Keyless Entry: Description and Operation

RF RECEIVER (WHERE FITTED)

The RF receiver converts signals from the RF remote handset into digital messages and transmits them to the GEM (generic electronic module). The RF receiver is installed at the rear of the roof, above the roof liner, to the left of the vehicle centerline.

Operation of the RF receiver is powered by a permanent battery feed from the AJB. RF remote handset signals are received by the rear window antenna and passed to the RF receiver via the antenna amplifier.

INFRARED RECEIVER (WHERE FITTED)

The infrared receiver converts the signals from the infrared remote handset into digital messages and transmits them to the GEM (generic electronic module). The infrared receiver is integrated into the interior rear view mirror, with the receiving diodes installed in the circular knob on the underside of the mirror. Operation of the receiver is powered by a permanent battery feed from the CJB (central junction box).

SYSTEM OPERATION

The locking system allows the doors and fuel filler door to be centrally locked and unlocked using the CLS switch, the driver door lock and the remote handset. The system has two locking states: locked and superlocked. Locking the vehicle from inside using the CLS switch puts the system into the locked state. Locking the vehicle from the outside using the driver door lock or the remote handset puts the vehicle into the superlocked state.

When the vehicle is locked, the GEM (generic electronic module):
^ Energizes the lock actuators in the side door latches to disengage the external door handles from the latches.
^ Energizes the fuel filler door actuator to extend the locking pin to secure the filler door (all except NAS).
^ Ignores inputs from the upper tailgate external release switch.

The GEM (generic electronic module) will lock the vehicle regardless of the position of the ignition switch and whether the key is in the ignition switch or not. The upper tailgate internal release switch remains enabled and individual side doors can be unlocked using the internal door handle. From the locked state, the vehicle can be centrally unlocked using the CLS switch, the remote handset or the driver door lock.

When the vehicle is superlocked, the GEM (generic electronic module):
^ Energizes the lock and the superlock actuators in the side door latches to disengage both the internal and the external door handles from the latches.
^ Energizes the fuel filler door actuator to extend the locking pin to secure the filler door (all except NAS).
^ Ignores inputs from both the external and the internal release switches of the upper tailgate.
^ Ignores inputs from the CLS switch.

The GEM (generic electronic module) will only superlock the vehicle after the ignition key has been removed from the ignition switch and the driver door has opened. From the superlocked state, the vehicle can be centrally unlocked using the remote handset or the driver door lock.

Tailgate Opening

When the vehicle is locked or superlocked, operating the tailgate release button on the remote handset causes the GEM (generic electronic module) to actuate the upper tailgate release actuator while leaving the remainder of the system in the locked/superlocked condition.

Volumetric protection is disabled when the tailgate is opened.

SPE (Single Point Entry)

With the vehicle superlocked and SPE enabled, when the GEM (generic electronic module) receives a request from the remote handset or the driver door lock it unlocks the driver door and changes the rest of the CLS from the superlocked to the locked state. When it receives a second unlock request, from the remote handset, the driver door lock or the CLS switch, the GEM (generic electronic module) unlocks the remainder of the system.

Automatic Locking

The GEM (generic electronic module) can be configured to automatically lock the system when the vehicle exceeds a set speed. The set speed is selectable between 4 and 28 km/h (2.5 and 17.5 mph), in 4 km/h (2.5 mph) increments.

To guard against accidental unlocking, the GEM (generic electronic module) can also be configured to automatically lock (not superlock) the system if no ajar switch or CLS switch is activated within 2 minutes of unlocking the vehicle with the remote handset.

Automatic Unlocking

If a crash that triggers any of the air bags occurs, the RCM (restraints control module) outputs a crash signal to the GEM (generic electronic module). On receipt of the crash signal the GEM (generic electronic module) outputs unlock signals to all of the door latch actuators and, where fitted, the fuel filler door actuator, irrespective of their current locked state. Subsequent attempts to lock the doors are inhibited until the GEM (generic electronic module) has received an unlock request.

Repetition Blocking

To protect the door latch actuators the GEM (generic electronic module) incorporates a repetition blocking feature. The GEM (generic electronic module) increments an internal counter by one each time an actuation occurs and decrements the counter by one every 8 seconds. If the counter exceeds 15, the GEM (generic electronic module) blocks further unlocking commands until the counter returns to 15 or less. The block is ignored if the GEM (generic electronic module) receives a crash signal or the system goes from superlocked to locked. In addition to the counter for the side doors, separate counters are maintained for each of the tailgates.

Lockout Protection

The vehicle cannot be locked when either of the front doors is open. The vehicle cannot be superlocked when the driver door is open.