Keyless Entry: Description and Operation

KEYLESS ENTRY SYSTEM DESCRIPTION AND OPERATION

The remote keyless entry (RKE) system allows operation of the door locks and interior lighting from outside the vehicle. 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 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 twice (if selected ON in personalization).
- Disarm the content theft deterrent (CTD) system (if equipped).
- Deactivate the CTD system when in the Alarm Mode (if equipped).
- Chirp the horn twice (if selected ON in personalization).

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.
- Flash the daytime running lamps twice (if selected ON in personalization).
- Chirp the horn twice (if selected ON in personalization).

Lock All Doors
Press the LOCK button in order to perform the following functions:
- Lock all of the doors.
- Illuminate the interior lamps for 2 seconds after all doors are closed.
- Flash the daytime running lamps(if selected ON in personalization).
- Chirp the horn if the lock button is pressed a second time within 5 seconds (if selected ON in personalization).
- Arm the content theft deterrent (CTD) system.
- Sound the chime 3 times if any door is open when the lock button is pressed (delayed locking).

Alarm
A single press of the panic button performs the following functions:
- Illuminate the interior lamps.
- Pulse the horn.
- Flash the head lamps.
- All will occur for a predetermined period of time or until any of the following conditions occur:
- The panic button is pressed again.
- The ignition switch is turned to the RUN position with a valid key.
- The vehicle is unlocked with the 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, 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.