Power Locks: Description and Operation
POWER DOOR LOCKSThe power lock system allows all doors to be locked or unlocked electrically by operating the switch on either front door trim panel. The power lock system operates on non-switched battery current supplied through a fuse in the junction block so that the system remains functional, regardless of the ignition switch position.
All doors can be locked or unlocked electrically by operating the switch on either front door panel.
The rear doors can be locked or unlocked by actuation of the front door switch, or can be locked or unlocked mechanically and independently with their respective locking knobs.
The front doors can be locked or unlocked mechanically with the locking knob regardless of electrical locking and unlocking actuation with the front door knobs.
The right and left front door on all vehicles can be locked or unlocked mechanically from the outside with the key or electrically as described above. The left and right front doors can also be unlocked by actuation of the inside remote door handle.
AUTOMATIC DOOR LOCKS
The system includes an automatic door locking feature actuated by the Body Control Module (BCM). The vehicle is built with the system enabled. The system can be enabled/disabled by the customer. Refer to the owner's manual for information.
The BCM will automatically lock all doors when all of the conditions below are met:
- All doors are closed
- The vehicle speed exceeds 15 ± 1 M.P.H.
- The throttle position sensor tip-in is greater than 10 ± 2 degrees
When the system is disabled the door locks will work by use of the door lock switches only. When this system is enabled the automatic door locks will work automatically.
Auto unlock on exit is a feature which, when enabled, automatically unlocks all doors upon the ignition switch being turned off and the opening of the driver's door. Auto unlock on exit is only operable when the automatic door locks are enabled.
The BCM controls the power locks when the door lock switch is activated. If the door lock switch is pressed for longer than eight consecutive seconds, the BCM will de-energize the door lock relay.
The automatic door lock system can be enabled/disabled either by the customer or with the DRB III(R) scan tool. Refer to the DRB III(R) or the vehicle owners manual for enabling/disabling procedures.
The BCM will automatically re-lock all doors if the above conditions are met and if any of the doors become ajar and then closes again.
The power latches are also equipped with a thermal protection system which prevents the latches from burning out.
CENTRAL LOCKING
The central locking system is part of the Vehicle Theft Security System. This feature allows the doors to be locked/unlocked all at once with the turn of the key in the drivers door.
Using the key, turn the driver's door cylinder lock to the lock position, all doors will lock. This feature operates differently on each door. Turn key in the driver's door to the unlock position once will unlock driver's door only. Turning the key a second time to the unlock position within five seconds of the first time will unlock all doors.
The lock/unlock operation will arm/disarm the Vehicle Theft Security System and will also activate/ cancel the illuminated entry feature.
CHILD PROTECTION LOCK
The child protection locks are on the rear doors only. When enabled, they render the inside remote door release handles inoperative.
The lock when engaged, will disable the inside door handle from opening the door. The lock is part of the latch/lock assembly. The lock is engaged by moving a lever that is located on the rearward inside edge of the door.
DOOR LOCK INHIBIT
The door lock inhibit feature is designed to prevent the locking of keys in a vehicle. The drivers door cannot be locked unless the keys are removed from the ignition switch.
With the key in the ignition switch in the ON or OFF position and the driver's door open the BCM will ignore the command to lock the power door locks. Once the key is removed, or the driver's door is closed, the body control module will allow the power door locks to lock.
REMOTE KEYLESS ENTRY
Remote Keyless Entry Transmitter:
The system allows locking and unlocking of vehicle door(s), deck lid release, and panic by remote control using a hand held radio frequency transmitter. The vehicle must be in PARK before the trunk lid can be unlatched with the transmitter.
The receiver may receive signals from up to four transmitters. Each transmitter has its own code, and the code is programmed and stored into receiver memory. If a transmitter is replaced or additional transmitters are added, the codes for all units have to be reprogrammed into the receiver memory. If a receiver module is replaced, the transmitter codes must be stored in the new receiver memory.
The transmitter has four buttons for operation. They are LOCK, UNLOCK, DECK LID RELEASE, and PANIC.
- The UNLOCK button will unlock the driver's door and enable illuminated entry. Pushing and releasing the button once will unlock the driver's door. Pushing and releasing the button two times, within a five second interval, will unlock all doors.The unlock sequence can be toggled between driver door first and all door unlock functions.
- Upon pressing the LOCK button, the horn will sound a short CHIRP (if enabled) and flash the park lamps to notify that the all door lock signal was received and set. Illuminated entry is cancelled and the interior lamps are faded to off.
- DECK LID RELEASE - The Deck Lid release button changes from a default "press twice" actuation to a "press and hold" (for approximately one third of a second) default. Note that this is customer programmable to "no delay" if so desired.
- Pushing and holding the PANIC button will cause the panic alarm to sound for three minutes, until the panic button is pressed and held a second time, or the vehicle reaches a speed of 15 mph.
The receiver is capable of retaining a Vehicle Access Code (VAC) even when power is removed.
Each Remote Keyless Entry (RKE) module must have at least one and no more than four transmitters.
HORN CHIRP TOGGLE
Once the transmitters have been programmed, the horn chirp can be enabled/disabled by sending the horn chirp toggle operation code to the Body Control Module (BCM).
This can be done using a DRB III(R) scan tool or by the customer. The horn chirp will enter the opposite state of its current programmed state by receiving this operation code. The BCM is responsible for keeping track of the horn chirp status.