Keyless Entry: Description and Operation

Keyless Entry System Description and Operation

The keyless entry system is a supplementary vehicle entry device. 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 body control module (BCM)

When you press a button on a transmitter, the transmitter sends a signal to the BCM. The BCM interprets the signal and activates the requested 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 20 seconds or until the ignition is turned ON.
* Flash the daytime running lamps, if selected ON in personalization.
* Disarm the content theft deterrent (CTD) system, if equipped.
* Chirp the horn, if selected ON in personalization.
* Identify the driver to the radio.

Unlock All Doors - Second Operation

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 20 seconds or until the ignition is turned ON.

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 daytime running lamps, if selected ON in personalization.
* Chirp the horn, if selected ON in personalization.
* Arm the content theft deterrent (CTD) system after all of the doors are closed.

Rear Compartment Lid Release

If the vehicle transaxle is in PARK or NEUTRAL 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 daytime running lamps for 2 minutes or until the following conditions occur:

- The panic button is pressed again.
- The ignition switch is turned to the RUN position 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 body control module (BCM) are synchronized to the appropriate order. If a programmed transmitter sends a signal that is not in the order that the BCM expects, the system will not function. This occurs after 256 presses of any button on the transmitter when it is out of range of the vehicle.

Automatic Synchronization

The keyless entry transmitters do not require a manual synchronization procedure. If needed, the transmitters automatically resynchronize when any button on the transmitter is pressed within range of the vehicle. The transmitter will operate normally after the automatic synchronization.