Keyless Entry System Description and Operation. Buick Century 2001

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2001 🢒 Century 🢒 Body and Accessories 🢒 Doors 🢒 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 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 RCDLR communicates with the body control module (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 request to the BCM and the BCM 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.

•	Flash the exterior lights (if selected ON in Personalization).

•	Chirp the horn (if selected ON in Personalization).

•	Illuminate the interior lamps for approximately 40 seconds or until the ignition is turned ON.

•	Disarm the content theft deterrent (CTD) system (if equipped).

•	Deactivate the CTD system when in the Alarm Mode (if equipped).

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.

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.

•	Arm the content theft deterrent (CTD) system.

Press the Lock button a second time within 5 seconds of the first press in order to:

•	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 in the OFF position, a single press of the rear compartment release button will open the rear compartment lid. The interior lamps will not illuminate.

Alarm

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

•	Illuminates the interior lamps.

•	Pulses the horn.

•	Flashes the head lamps.

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.

Keyless Entry Personalization

The exterior lamps and horn chirp may be personalized as part of remote activation verification. For mode descriptions and programming instructions, refer to Personalization Description and Operation in Personalization.

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.