Locks: Description and Operation

Handles, Locks, Latches and Entry Systems

Component Locations - Sheet 1 Of 2





Component Locations - Sheet 2 Of 2





General

The hinged panels on the vehicle are secured with latches and mating strikers. A safety catch is installed on the hood to prevent it from opening if the hood latches are open while the vehicle is moving.

The hood latches and the door latches are opened by pulling on the release handles. The tailgate latches are opened by pressing the release switches.

A remotely operated CLS controls the locking and unlocking of the door latches and the opening of the tailgate latches. In some markets, the CLS also locks and unlocks the fuel filler door. The CLS software is incorporated into the GEM (generic electronic module).

The driver exterior door handle incorporates a door lock. The door lock enables operation of the CLS with the ignition key if the remote operation fails, and allows the left front door to be mechanically unlocked if there is a vehicle power failure.

The rear door latches incorporate child locks to enable the interior door handles to be disengaged from the latch mechanisms.

Hood Latches
The hood is secured by two latches, installed under the hood locking platform, which engage with strikers on the hood. The hood safety catch is installed to the left of the hood leading edge centerline, and engages with a recess in the hood locking platform.

The hood latches are opened by a release handle on the lower part of the driver side A pillar. Two hood release cables connect the release handle in series with the two hood latches. The two hood release cables are joined together by a connector block located on the inner fender.

Door Latches
The side door latches are sealed units that incorporate separate actuators for locking and superlocking the doors. Each door latch also incorporates a Hall effect sensor that operates as an ajar switch to provide a door status signal for the GEM (generic electronic module). The driver door latch incorporates two additional Hall effect sensors to provide signals of lock and unlock selections made with the ignition key in the door lock. Turning the top of the ignition key rearwards sends a lock signal and turning the top of the ignition key forwards sends an unlock signal. The driver and front passenger door latches communicate with the GEM (generic electronic module) via their respective door modules and the P bus. The rear door latches are connected direct to the GEM (generic electronic module).

Each of the door latches is connected to a locking button in the top of the door trim panel. Pressing the locking button down when the door is closed disengages the exterior handle from the door latch to lock the door. Pulling on the interior handle extends the locking button from the door trim again and re-engages the exterior handle with the door latch, to unlock the door (without opening the door latch). A second pull on the interior door handle opens the door latch. On all except the driver door, the doors can be slam locked after pressing the button down while the door is open. For lockout protection, the driver door locking button cannot be pressed down when the driver door is open.

Door Latch





Tailgate Latches
The upper tailgate latch incorporates a release actuator to open the upper tailgate and a microswitch that operates as an ajar switch to provide a tailgate status signal to the GEM (generic electronic module). A black manual release wire is attached to the upper tailgate latch to allow the latch to be released in the event of actuator failure or loss of power. The end of the manual release wire is stowed in the inside trim at the bottom edge of the upper tailgate and is concealed by the trailing edge of the parcel shelf when the upper tailgate is closed.

Each lower tailgate latch is connected to a release actuator mounted inside the tailgate. A lever at the top of each latch housing allows the latches to be released in the event of actuator failure or loss of power. The levers are only accessible when the upper tailgate is open.

Upper Tailgate Latch





Hood Ajar Switch
The hood ajar switch is a plunger operated switch installed in the engine compartment, on the driver side of the secondary bulkhead. When the hood is closed, the hood presses the plunger into the switch housing and holds the switch open. When the hood opens, the spring loaded plunger extends, which allows the switch to close and connect a ground to the GEM (generic electronic module). The switch can also be held open while the hood is open, by pulling the plunger up.

Fuel Filler Door Actuator
The fuel filler door actuator extends and retracts a wire reinforced plastic pin to lock and unlock the fuel filler door. A green manual release wire is attached to the pin to ensure the fuel filler door can be released in the event of actuator failure or loss of power. The end of the manual release wire is stowed in the soundproofing behind the trim panel covering the AJB (auxiliary junction box).

CLS Switch
The CLS switch is a non latching push switch installed between the center face vents on the instrument panel, below the hazard warning switch. The CLS switch allows occupants to centrally lock the vehicle without arming the alarm. When the CLS switch is pressed, a battery voltage signal is connected to the GEM (generic electronic module).

Upper Tailgate Internal Release Switch
The internal upper tailgate release switch is a non latching push switch installed on the center console. The switch allows the tailgate to be opened from inside the vehicle. When the switch is pressed a ground is connected to the GEM (generic electronic module). The GEM (generic electronic module) only responds to the input when the CLS system is unlocked and the vehicle is stationary.

Upper Tailgate External Release Switch
The external upper tailgate release switch is a microswitch installed in the license plate lamp housing in the bottom edge of the upper tailgate. The switch is operated by a lever connected to a rubber covered plate set into the outside surface of the license plate lamp housing. When the switch is activated it connects a ground to the GEM (generic electronic module). The GEM (generic electronic module) only responds to the input when the CLS system is unlocked and the vehicle is stationary.

Lower Tailgate Release Switch
The lower tailgate release switch is a non latching push switch installed under a rubber cover in the top edge of the lower tailgate. When the switch is pressed, a battery voltage signal is connected to the GEM (generic electronic module). The GEM (generic electronic module) only responds to the input when the upper tailgate is unlatched and the vehicle is stationary.

Lower Tailgate Release Relay
The lower tailgate release relay is installed on the AJB. When the GEM (generic electronic module) receives a valid input from the lower tailgate release switch, it momentarily energizes the relay to simultaneously activate the two lower tailgate release actuators.

Ignition Key/remote Handset





The remote handset is incorporated into the head of the ignition key. At any one time, up to four different remote handsets can be initialized for use on the same vehicle.

The type of transmitter is market dependent and is either a RF transmitter, operating at 315 or 433 MHz, or an infrared transmitter. RF transmitters communicate with the vehicle through the radio antenna integrated into the rear window heater, and have an operating range of 10 m (32.8 ft) minimum and up 30 m (98.4 ft) under optimum conditions. Infrared transmitters communicate with the vehicle through an infrared receiver integrated into the interior rear view mirror and have an operating range of 3 m (9.8 ft) minimum and up to 5 m (16.4 ft) under optimum conditions.

Each remote handset incorporates a signal processor, transmitter and power supply in a dustproof and waterproof housing. Buttons on the housing operate the remote functions. A LED (light emitting diode) on the housing flashes when a button is pressed to confirm operation to the user. If the LED (light emitting diode) does not flash when a button is pressed the battery needs recharging/replacing.

RF remote handsets have three operating buttons:

^ The lock button, for locking and superlocking of the vehicle and convenience closing of the windows and sunroof.
^ The unlock button, for unlocking the vehicle and convenience opening of the windows and sunroof.
^ The tailgate open button, for opening the tailgate while the rest of the vehicle remains locked and for panic alarm activation.

Infrared remote handsets only have two operating buttons, a lock button and an unlock button.

The remote handset functions as follows:
^ One press of the lock button for superlocking.
^ Two presses of the lock button for no volumetric protection.
^ Press and hold the tailgate switch for panic mode.

The power supply in the remote handset is provided by a single button cell battery on RF systems and two button cell batteries on infrared systems. When the batteries need replacing the message 'KEY BATTERY LOW' will be displayed in the message center. When the batteries are replaced, the old ones should be removed and the new ones installed within 1 minute or stored data will be lost and the remote handset will need to be re-initialized.

Battery Replacement on Remote Handset





Every signal from the remote handset contains the transmitter identification code and a rolling code. The GEM (generic electronic module) checks the codes and only responds if the signal is from a valid transmitter. During vehicle production, the remote handsets supplied with the vehicle are initialized to set their individual transmitter identification codes and synchronize their respective rolling codes with the GEM (generic electronic module). If a replacement or additional remote handset is to be used with the vehicle, the initialization procedure must be repeated. During the procedure, all remote handsets for use with the vehicle must be initialized.

Initialization Procedure
^ Ensure the vehicle is unlocked and the driver and front passenger doors are closed.
^ Install a key/remote handset in the ignition switch, then turn the ignition switch to position I and back to position 0 in less than 5 seconds to put the GEM (generic electronic module) into the initialization mode. Continue the procedure within 30 seconds of turning the ignition switch to position 0.
^ Remove the key/remote handset from the ignition switch.
^ Press and hold the unlock button for a maximum of 15 seconds. During this time, momentarily press the lock button three times within 10 seconds.
^ Release both buttons.
^ Successful initialization is indicated by the GEM (generic electronic module) locking then unlocking the vehicle. If this does not occur, repeat step D.
^ Repeat steps D. and E. with all other remote handsets belonging to the vehicle (4 maximum). Begin the initialization of each remote handset within 30 seconds of completing the previous initialization, or the GEM (generic electronic module) will drop out of the initialization mode and the complete procedure will have to be started again.

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 4and 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.

Control Diagram