Keyless Entry: Description and Operation

DESCRIPTION

The Keyless Entry system allows locking and unlocking of vehicle door(s) and trunk lid by remote control using a hand held radio frequency transmitter. The ignition switch must be OFF before the trunk lid can be unlatched with the transmitter.

The receiver may receive signals from two transmitters. Each transmitter has its own code, and the code is programmed and stored into receiver memory. If the transmitter is replaced or a second transmitter is added, the codes of both 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.

OPERATION

RKE Transmitter:

The transmitter has three buttons for operation. They are LOCK, UNLOCK and TRUNK release.

^ 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 seconds interval, will unlock all doors.

^ Upon pressing the LOCK button, the horn will sound a short CHIRP to notify that the all door lock signal was received and set.

^ Pushing and releasing the TRUNK UNLOCK button two times, within a two second interval, will slightly ajar the trunk lid.

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

Each remote keyless entry module (RKE) must have at least one and no more than two transmitters.

TRANSMITTER BATTERY

The transmitter has two 3 volt batteries, which can be removed and replaced without special tools. The batteries are available at local retail stores. Recommended battery is Panasonic CR 2016 or equivalent. Battery life is about two years.

TRANSMITTER CONTROL RANGE

Operation range is within 7 meters (23 ft.) of the receiver.

CIRCUIT OPERATION

On vehicles equipped with Remote Keyless Entry (RKE) the doors can be locked or unlocked, and the trunk can be opened, using the transmitter.

Power for the RKE module is supplied from two circuits.

One circuit is G5. This circuit is protected by a 5 Amp fuse located in cavity 14 of the junction block. Power for the fuse is supplied on circuit A21 from the ignition switch. This circuit is HOT in the START and RUN positions only

Circuit A1 from the Power Distribution Center (PDC) supplies power to the ignition switch. This circuit is protected by a 20 Amp fuse located in cavity A of the PDC.

The second power source is on circuit M1. This is the Ignition-Off Draw (IOD) circuit and is protected by a 10 Amp fuse located in cavity 13 of the junction block. Power for the fuse is supplied by circuit A7 from the PDC. Circuit A7 is protected by a 20 Amp fuse located in cavity G of the PDC.

Ground for the RKE module is provided on circuit Z1. This circuit terminates at the Airbag Control Module (ACM) bracket.

Circuit D9 is used for programming the RKE module. This circuit connects from the module to the universal data link connector.

Illuminated entry can also be activated through the RKE module. This is accomplished on circuit M22. This circuit connects from the module to the Body Control Module (BCM).

Circuit X3 connects from the RKE module to the ground side of the horn relay coil. This circuit is spliced in with the BCM and the horn switches.