The Remote Function Actuator (RFA) module is part of the remote keyless entry system. The RFA module sends a serial data message to the Body Control Module (BCM) through the Class 2 serial data line. The RFA Transmitter (Key Fob) sends the following commands to the RFA Module:

The RFA module then sends a serial data message to the BCM in order to perform the appropriate function. For programming of the RFA System refer to Keyless Entry.

Wake-up signals turn ON the BCM and cause the BCM to begin active control and/or monitoring of certain devices. The BCM wake-ups are:

The BCM is asleep when the BCM has stopped controlling or monitoring devices and has become idle again. After the ignition switch is turned to the LOCK position and 20 minutes (1216 seconds) elapse without any wake-up signals, the BCM enters into an asleep state and goes into the low power mode. If the BCM is in low power mode and detects a wake up, the BCM enters into the wake-up state and enters the high power mode. If the vehicle has been left inactive (the ignition is in the LOCK position with no BCM wake-ups) for 20 minutes, the BCM returns to the low power mode.

The front fog lamps are a controlled option of the BCM. If the park lamps are ON, the high beams are OFF when you press the fog lamp switch, the BCM commands the fog lamp relay to turn the front fog lamps ON. Toggle the high/low beam switch and the front fog lamps toggle OFF.

The panic alarm (flashing head lamps and chirping horn) activates after you press the horn button on the RFA transmitter. Press the horn button again in order to de-activate the head lamps and the horn. Pressing the horn button only once on the RFA transmitter activates the head lamps and the horn for 30 seconds or until the ignition switch is turned to the RUN position.

The Passlock® theft deterrent system is designed to prevent vehicle operation if the correct Ignition key is not used to start the vehicle. The ignition key allows the lock cylinder to turn, which allows the Passlock® sensor (located inside of the ignition switch assembly) to send a code to the BCM. If the BCM receives the correct code from the Passlock® sensor, the BCM sends a password to the Powertrain Control Module (PCM) which allows the vehicle to start. For more information on the Passlock® system, refer to Theft Deterrent.

The battery run down protection system provides protection against parasitic loads, excessive battery drain, and high current loads related to the courtesy lamp circuit. The battery run down protection system also protects the battery against run-down from the courtesy lamp circuit to the level which prevents the vehicle from starting. The BCM turns OFF the courtesy lamp circuit after the ignition switch is turned from the RUN position to the OFF position and 20 minutes (1216 seconds) have elapsed without a lamp request Input. You must perform one of the following actions in order to return the BCM to normal operation once the battery run down protection has shut the interior lamps OFF.

The BCM turns OFF inadvertent power relay after 20 minutes (1216 seconds) in order to preserve battery power. The 20-minute timer starts after any one of the following conditions:

If any one of the following inputs reoccur during the 20-minute timer period, the timer is reset to 20 minutes (1216 seconds).

Interior lights illuminate for 20 seconds when the ignition key is removed from the ignition cylinder.

Interior lights illuminate for 40 seconds when the UNLOCK button is pressed on the RFA transmitter. Interior lights illuminate for 2 seconds when the LOCK button is pressed on the RFA Transmitter.

The Body Control Module (BCM) is responsible for energizing the driver's door unlock relay. The drivers door unlock relay is energized whenever the BCM receives a command from the door lock/unlock switches or from an input from the RFA module on the class2 serial data line.

The Body Control Module (BCM) commands the driver's door unlock relay to unlock the driver's door according to the state of the driver's door lock/unlock switch or the passenger door lock/unlock switch.

When the Body Control Module (BCM) determines a that a driver warning sound is needed, the BCM sounds the chime when applicable.

The key-in reminder chime sounds when all of the following conditions are true:

Refer to Audible Warnings.

The head lamp reminder chime sounds when all of the following conditions are true:

The head lamp reminder chime does not sound when the following conditions are true:

Refer to Audible Warnings.

The seat belt reminder chime sounds for 6 seconds when the ignition switch is turned from the OFF position to the RUN position and the seat belt is unfastened. The seat belt telltale on the IPC also turns ON. Refer to Audible Warnings.

The turn signal reminder chime sounds when the right or the left turn signal remains ON for more than 0.75 miles. The chime is synchronous with the turn signal flasher. Refer to Audible Warnings.

The BCM sends requests to turn the Instrument Panel Cluster (IPC) telltales ON or OFF. These requests are sent on the Class 2 serial data line. If the IPC can not communicate with the BCM via Class 2, the IPC turns the security telltale ON steady. The list of messages sent by the BCM to the IPC are as follows:

The BCM can turn ON the following lighting components independently of the interior lighting system: