Keyless Entry: Description and Operation

REMOTE KEYLESS ENTRY SYSTEM
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.

NOTE: The module must be in the "CUSTOMER USAGE" mode of operation for the remote keyless entry system to function.

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.
- 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.
- Pushing and releasing the DECK LID RELEASE button (one or two times depending on customer preference) within a two second interval, will slightly ajar the deck lid.
- 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.
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.

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 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.

The toggling of the horn chirp (between enabled and disabled) can be performed with the use of the DRB III scan tool or by the customer.

DRB III(R) PROGRAMMING When using the DRB III- scan tool, select:
1. "Theft Alarm"
2. "VTSS"
3. "Miscellaneous"and then the desired function.

Customer Programming
Using a transmitter programmed to the RKE Module, the status of the horn chirp may be toggled by the customer.

NOTE: The RKE Module is responsible for keeping track of the horn chirp status; thus this procedure does not need to be repeated for each transmitter programmed to the system.

Fig.2 Remote Keyless Entry Transmitter:

1.With the ignition switch in RUN position, press and hold the transmitter Unlock button for a minimum of 4 seconds to a maximum of 10 seconds.
2.Within the 4-10 second range, depress the transmitter Lock button. A chime will be heard to indicate a successful toggle, at which time the buttons may be released.