GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Park Avenue 🢒 Body and Accessories 🢒 Keyless Entry 🢒 Keyless Entry System Description

The keyless entry system is a supplementary vehicle entry device. Use the keyless entry system in conjunction with a door lock key. Radio frequencies or discharged batteries may disable the system. Therefore, always carry a door lock key.

Keyless entry allows you to operate the following components:

    • The door locks.
    • The rear compartment lid release
    • The illuminated entry lamps (if equipped)
    • The panic alarm (instant alarm)

The keyless entry system has the following main components:

    • The transmitters
    • The remote function actuator (RFA) module

When you press a button on a transmitter, the transmitter sends a signal to the RFA module. The RFA module interprets the signal and activates the requested function via a Class 2 message over the serial data line. The keyless entry system operates as follows:

    • Pressing the UNLOCK button once causes the following actions occur:
       - Unlock the driver's door.
       - Turn on the interior lamps if the ignition switch is OFF.
    • Pressing the UNLOCK button again within five seconds unlocks all the doors.
    • Pressing the LOCK button locks all the doors.
    • Pressing the TRUNK button releases the rear compartment lid.
    • Pressing the PANIC button perform the following actions:
       - Sound the horn.
       - Flash the park lamps for up to 30 seconds.
    • Use one of the following procedures to deactivate the panic mode:
       - Press the transmitter button.
       - Use the key in order to unlock the vehicle (for vehicles equipped with content theft deterrent).
       - Turn the ignition switch to RUN.

Rolling Code

The keyless entry system uses a rolling code technology. Rolling code technology prevents anyone from recording the message sent from the transmitter and using the message in order to gain entry to the vehicle. The term "rolling code" refers to the way that the keyless entry system sends and receives the signals. The transmitter sends the signal in a different order each time. The transmitter and the receiver are synchronized to the appropriate order. When the transmitter sends a signal that is not in the order that the receiver expects, then only the panic button will function.