GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Express 🢒 Accessories 🢒 Keyless Entry 🢒 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.

Keyless entry allows you to operate the following components:

    • The door locks
    • The illuminated entry lamps

The keyless entry system has the following main components:

    • The transmitters
    • The remote control door lock receiver (RCDLR)

When you press any button on a programmed keyless entry transmitter, the transmitter sends a signal to the RCDLR. The RCDLR performs the appropriate function.

Unlock Driver's Door 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.

Unlock All Doors (Second Operation)

Momentarily press the UNLOCK button a second time, within 2 seconds of the first press, in order to unlock the remaining doors.

Unlock Rear Door

Press the REAR button 2 times in order to unlock the rear door only.

Lock All Doors

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

    • Lock all of the doors.
    • Flash the parking lamps.
    • Turn the interior lamps on briefly.

Press the LOCK button again within 5 seconds of the first press in order to perform the following functions:

    • Chirp the horn.
    • Flash the parking lamps.
    • Immediately turn off the interior lamps.

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 transmitter is out of synchronization. This occurs after 256 presses of any transmitter button when it is out of range of the vehicle.