Power Locks: Description and Operation
HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS5 Door Shown, 3 Door, 4 Door And Wagon Similar, Part 1:
5 Door Shown, 3 Door, 4 Door And Wagon Similar, Part 2:
The passenger compartment doors are of a conventional latch-to-striker plate design with the striker located on the B and C pillars with a built-in door ajar switch.
The hood and liftgate striker plates locate into latches positioned in the vehicle body.
The hood can only be opened by operating the hood release cable handle situated in the instrument panel lower panel.
The liftgate or luggage compartment lid can be opened by a release switch located in the instrument panel. It can also be opened with the ignition key in the lock cylinder, by pressing the liftgate/luggage compartment lid release switch on the remote transmitter or on wagon only, pressing the exterior liftgate release switch on the liftgate.
The door latch mechanisms are operated by a conventional actuating rod and cable system connected to the inner and outer latch handles.
The power lock system consists of the components used in the manual door lock system and includes power door lock switches, power door lock actuator, circuit wiring and circuit protection.
The door handle and latch are removed from the inside of the door panel. The handle and latch cannot be removed separately. The actuating rods and latches are covered inside the door by a security shield.
The remote transmitter operates the following functions:
- Unlocking and locking the driver door.
- Unlocking and locking all doors.
- Unlocking and locking the liftgate.
- Arms and disarms the anti-theft alarm system.
- Deactivates a triggered alarm.
- Activate and deactivates the panic alarm.
The remote transmitter has a minimum operating range of 10 m (33 feet).
Inputs and Outputs
The keyless entry lock system receives inputs from the following:
- Ignition switch (positions I and II).
- Door ajar switches.
- Hood ajar switch.
- Interior liftgate/luggage compartment lid release switch.
- Exterior liftgate release switch (Wagon only).
- Remote transmitter.
- Anti-theft liftgate alarm inhibit switch.
The keyless entry lock system distributes outputs to the following:
- GEM.
- Door lock actuators.
- Indicator LED.
- Direction indicators.
- Vehicle horn.
Remote transmitter
The keyless entry lock system is completely independent in function but fully integrated within the GEM. The remote control system consists of a remote transmitter and an antenna (radio frequency system).
The remote transmitter for the radio frequency system will operate without the remote transmitter being directed at the vehicle. The normal range between the remote transmitter and the antenna will be 10 meters.
Before the remote control system can be used, each remote transmitter must be initialized to the vehicle. A maximum number of four remote transmitters can be initialized to any vehicle. All remote transmitters must be initialized at the same time.
The keyless entry locks will not operate with the ignition switch in the RUN position.
Locking and Unlocking
The remote transmitter contains four buttons to operate the system.
Press the LOCK button once to activate the central locking system and the alarm system (if equipped).
Press the LOCK button twice within three seconds and a horn tone will be heard along with a flash of the direction indicators indicating that the doors are locked. If any of the doors are ajar, the horn will sound twice.
Press the UNLOCK button once to unlock the driver door and disarm the alarm system (if equipped).
Press the UNLOCK button twice within three seconds to unlock the remaining doors.
Press the LIFTGATE RELEASE button once to release the liftgate/decklid. This function will only work if the ignition is in the OFF or ACC position or the vehicle speed is less than 4 mph (7 km/h).
Press the PANIC ALARM button to turn on the personal alarm.
Press the PANIC ALARM button a second time to turn off the personal alarm. The personal alarm will also turn off if the ignition switch is turned to the ON or RUN position, or after 2 minutes of operation.
With the key in the OFF/ACC positions, pressing the remote transmitter LOCK and UNLOCK buttons simultaneously for a minimum of 4 seconds toggles the unlocking mode from single door unlocking to central unlocking. Pressing both buttons again for 4 seconds toggles back to single door unlocking mode. Mode change is indicated by 2 flashes of the park lamps.
GEM
Refer to Body Control Systems (Multifunction Electronic Control Module).
PRINCIPLES OF OPERATIONS
The Door Switch Lock Function
When a door lock switch is moved into the lock position or a door lock cylinder is rotated to the lock position, the door lock switch grounds the lock circuit input to the generic electronic module (GEM). The GEM then provides 12 volts to one side of the door lock actuators contained in the door latch unit and simultaneously grounds the other side of the door lock actuators. This completes the door lock actuator circuit, causing the door lock actuators to rotate a cam assembly, which then locks the doors.
The Door Switch Unlock Function
When a door lock switch is moved into the unlock position, the door lock switch grounds the unlock circuit input to the GEM. The GEM then provides 12 volts to the opposite side (relative to locking the door) of the door lock actuator(s) contained in the door latch unit and simultaneously grounds the other side of the door lock actuator(s). This completes the door lock actuator circuit, causing the door lock actuator(s) to rotate a cam assembly in the opposite direction, which then unlocks the door(s). The 12 volts which the GEM provides to the door lock actuator(s) are provided to each door lock actuator from the individual pins on the GEM connector.
The Liftgate/Luggage Compartment Lid Release
All vehicles are equipped with an interior liftgate/luggage compartment lid release switch. The wagon has a liftgate/luggage compartment lid release switch and a liftgate release switch, exterior. When either switch is pressed, it grounds an input circuit to the GEM. When the GEM senses the ground, it sends 12 volts to cycle the liftgate/luggage compartment lid latch. The switches will only work when the alarm is disarmed.
Door Lock Cylinder Functions
Both the driver and passenger doors can be locked from either door lock cylinder. When the ignition key is inserted into either door lock and is rotated into the lock position, the linkage moves to rotate a cam in the door latch unit. When the cam in the door latch rotates, it mechanically moves the door latch (in the door in which the key is being used) into the locked position. The other doors are locked electronically.
Computer Operated Locks
Each front door lock actuator contains a bipolar motor that controls the lock and unlock linkage. The lock/unlock lever of both front door interior handles use linkage to actuate the lever lock switch located inside each front door lock actuator. The GEM uses only one electrical input for both lever lock switches. The GEM cannot determine whether the driver or passenger door lever lock switch was actuated. Therefore, actuating the lock feature from either front door lock button will have the same effect of locking all doors.
The door lock control switches for both front doors also use only one input to the GEM.
Both rear passenger doors contain a rear door lock actuator that controls only electric lock or unlock of the door. Actuating the lock/unlock lever at either rear passenger door will have no effect on other doors.