Keyless Entry: Description and Operation

INTRODUCTION
The Remote Keyless Entry System (RKE) allows locking and unlocking of vehicle door(s) by remote control using a hand held radio frequency transmitter.

The Body Control Module (BCM) may receive signals from up to four transmitters. Each transmitter has its own code, and the code is programmed and stored into BCM memory If the transmitter is replaced or an additional transmitter is added, the codes of all units may have to be reprogrammed into the BCM memory. If a BCM is replaced, the transmitter codes must be programmed in the new BCM memory.

Transmitter:

Operation
The transmitter has two buttons for operation. They are LOCK and UNLOCK.
Depressing the button:
- 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 five seconds interval, will unlock all doors.
- LOCK button, the horn will sound a short CHIRP to notify that the all door lock signal was received and set. The illuminated entry operation will be cancelled and all interior lamps will fade off.

The BCM is capable of retaining Vehicle Access Code (VAC) even when power is removed.

Each Remote Keyless Entry Module must have at least one and no more than four transmitters.

SYSTEM OPERATION
Illuminated Entry
The Illuminated Entry System is available on vehicles equipped with the Remote Keyless Entry system. The Illuminated Entry System turns ON the courtesy lamps when the remote keyless entry system is activated. The Remote Keyless Entry Module and the Body Controller are used to control the system. Courtesy lamps will turn on for 30 seconds (± 1 second) and fade to OFF over a five second period.

The Illuminated Entry System also turns ON the courtesy lamps (and ignition switch lamp) when door is opened. The courtesy lamps will remain ON while the door is open, then fade to OFF 30 seconds (± 1 second) after the last door is closed.

The courtesy and ignition switch lamps will fade to OFF immediately when the ignition is switched to ON.

The Illuminated Entry System cannot be activated during the 30 second (± 1 second) period after the ignition switch is turned OFF. After a door is opened and closed during this 30 second period, the system will function as previously described.

When the battery voltage has been interrupted to the Illuminated Entry System, the system will not function until the remote keyless entry UNLOCK is actuated.

Keyless Entry System
The system allows locking and unlocking of vehicle door(s) by remote control using a hand held radio transmitter.

Transmitter Battery
The transmitter has a 3 volt battery, which can be removed and replaced without special tools. The battery is available at local retail stores. Recommended battery is CR2025 Toshiba or equivalent. Battery life is about one to two years.

CIRCUIT OPERATION
Illuminated Entry
On vehicles equipped with Remote Keyless Entry (RKE) the Body Control Module (BCM) will turn ON the interior lamps with a valid UNLOCK signal from the RKE transmitter When the signal is received the BCM provides a ground path for circuit M2. This causes the interior lamps to illuminate. The BCM also controls the amount of time ON for the lamps.

Remote Keyless Entry
Operation of the power door lock system with Remote Keyless Entry (RKE) is the same as systems without RKE. The Body Control Module (BCM) still controls the operation of the door motors.

Two RKE antennas are connected to the BCM and is used to provide the input indicating what the operator is requesting.