Keyless Entry: Description and Operation
INTRODUCTIONRemote Keyless Entry (Key Fob) 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 module must be in the customer usage mode of operation for the remote keyless entry system to function.
The receiver may receive signals from up to four transmitters. Each transmitter has its own code, and the code is programmed and stored into RKE module memory. If a transmitter is replaced or additional transmitters are added, the codes for all units have to be reprogrammed into the RKE module memory. If a receiver module is replaced, the transmitter codes must be stored in the new receiver memory (by performing the steps for programming transmitters).
The RKE module is capable of retaining all transmitter codes when power is removed from the module.
Operation of the Remote Keyless Entry system works in a similar manner to the central locking/unlocking feature. With the double activation unlock feature enabled, the first press of the transmitter UNLOCK button will electrically unlock the driver door, and a second press of the UNLOCK button (within five seconds of the first) will unlock all vehicle doors. With the double activation feature disabled, all vehicle doors will unlock upon the first press of the transmitter UNLOCK button. The vehicle is locked electrically by pressing the transmitter LOCK button once, regardless of the state of the double activation unlock feature. The vehicle is shipped with the double activation unlock feature enabled.
The deck lid can be unlatched manually via the key cylinder from outside the vehicle, or by depressing the deck lid release button on the RKE transmitter twice (within five seconds).
The RKE module has three modes of operation including customer usage mode, dealer lot storage mode, and shipping mode. The customer usage mode provides full functionality of the module and is the mode in which the RKE module should be operating when used by the customer. Dealer lot storage mode and shipping modes are reduced power modes meant to extend vehicle battery life during shipping and storage in the dealer lot. Dealer lot storage mode provides limited VTSS and power door lock functions, but disables the Remote Keyless Entry (RKE) functions. This mode is intended to be used when the vehicle is on the dealer lot to provide VTSS coverage of the vehicle while minimizing battery drain. Shipping mode disables all normal functions (i.e. power door locks, RKE, and VTSS) of the module, and is intended to be used when the vehicle is shipped from the assembly plant.
NOTE: The dealer must remove the module from "Ship Mode" and place the RKE Module into either the "Dealer Lot" storage or "Customer Usage" modes of operation after receiving the vehicle from the assembly plant.
REMOTE KEYLESS ENTRY SYSTEM
The system allows locking and unlock of vehicle door(s) and deck lid by remote control using a hand held radio frequency (RF) transmitter. The vehicle speed must be less than five miles per hour before the deck lid can be unlatched with the transmitter. The receiver may receive signals from four transmitters. Each transmitter has its own code and the code has been stored in memory. If the transmitter is replaced or other transmitters are added, the code for each unit must be learned.
REMOTE KEYLESS ENTRY TRANSMITTER
The transmitter has four buttons for operation. They are LOCK, UNLOCK, DECK LID RELEASE, and PANIC.
- The UNLOCK button will unlock the driver door and enable illuminated entry. Pushing and releasing the button once will unlock the driver door. Pushing and releasing the button two times within a five second period will unlock all doors (double unlock activation enabled).
- 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 acted upon. Illuminated entry is cancelled and the interior lamps are faded to off.
- Pushing and releasing the DECK LID RELEASE button twice within a five second period will actuate the decklid release solenoid, causing the deck lid to be slightly ajar. If so desired, the decklid may be set to release after one button push by the dealer. For procedures on programming with the DRB III(R) scan tool, refer to the proper Body Diagnostic Procedures.
- Pushing the PANIC button will cause the panic alarm to sound for three minutes, until the panic button is pressed a second time, or until the vehicle reaches a speed of 15 mph.
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 RKE Module. 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 RKE module is responsible for keeping track of the horn chirp status.