GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2002 🢒 Grand Prix 🢒 Body and Accessories 🢒 Retained Accessory Power 🢒 Keyless Entry System Description and Operation

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
    • The panic alarm (instant alarm)

The keyless entry system has the following main components:

    • The transmitters
    • The remote control door lock receiver (RCDLR)
    • The body control module (BCM)

The RCDLR communicates with the BCM through the keyless entry serial data circuit. When you press a button on a transmitter, the transmitter sends a signal to the RCDLR. The RCDLR sends a lock, unlock, or panic alarm request to the BCM depending on which button is pressed on the transmitter. The BCM receives the message from the RCDLR and performs the appropriate function.

Unlock Driver's Door Only

(BCM MODE 2 ONLY) Momentarily press the UNLOCK button in order to perform the following functions:

    • Unlock the driver door only.
    • Illuminate the interior lamps for approximately 40 seconds or until the ignition is turned ON.
    • Flash the exterior lights (if selected ON in personalization).
    • Disarm the content theft deterrent (CTD) system.

Unlock All Doors

(BCM MODE 2 ONLY) Momentarily press the UNLOCK button a second time within 5 seconds of the first press in order to perform the following functions:

    • Unlock the remaining doors.
    • Illuminate the interior lamps for approximately 40 seconds or until the ignition is turned ON.
    • Flash the exterior lights (if selected ON in personalization).

(BCM MODE 1 ONLY) Momentarily press the UNLOCK button in order to perform the following functions:

    • Unlock all of the doors, including the driver door.
    • Illuminate the interior lamps for approximately 40 seconds or until the ignition is turned ON.
    • Flash the exterior lights (if selected ON in personalization).
    • Disarm the CTD system.

Lock All Doors

Press the LOCK button in order to perform the following functions:

    • Lock all of the doors.
    • Immediately turn off the interior lamps.
    • Flash the exterior lights (if selected ON in personalization).
    • Chirp the horn (if selected ON in personalization).
    • Arm the CTD system.

Lock All Doors (Second Operation)

On vehicles equipped with CTD, momentarily press the LOCK button a second time within 5 seconds in order to perform the following functions:

    • Flash the exterior lights (if selected ON in personalization).
    • Chirp the horn (if selected ON in personalization).

Rear Compartment Lid Release

If the vehicle transaxle is in PARK and the ignition is OFF, a single press of the rear release button will open the rear compartment lid.

Alarm

A single press of the panic button performs the following functions:

    • Illuminates the interior lamps.
    • Pulses the horn.
    • Flashes the headlamps.

The panic alarm continues for approximately 2 minutes or until either of the following occur:

    • The panic button is pressed again.
    • The ignition switch is turned to RUN with a valid key.

Rolling Code

The keyless entry system uses 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 RCDLR are synchronized to the appropriate order. If a programmed transmitter sends a signal that is not in the order that the RCDLR expects, then the keyless entry system will not function.