Keyless Entry System Description and Operation (Without ATS)

Keyless Entry System Description and Operation (Without ATS)

Keyless Entry System Description and Operation

The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the door locks to unlock the vehicle. Keyless entry will lock/unlock a door or open the rear compartment lid when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the remote control door lock receiver antenna that has a direct link to the body control module (BCM). The BCM interprets the signal and activates the requested function or request the appropriate ECU to activate the function via a serial data message. A low transmitter battery or radio frequency interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High radio frequency traffic areas, such as gas stations that use pay-at-the-pump radio frequency transponders, may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following features:

* Door lock/unlock

* Rear compartment lid release

* Illuminated entry lamps

* Panic alarm/Vehicle locator

* Remote vehicle start

* Automatic window express down, if equipped. Automatic window express up, if equipped

Keyless Entry Transmitters

By operating any of the exterior door handles, a nearby transmitter is challenged by a keyless entry antenna. The transmitter will send an RF response to the remote control door lock receive, which communicates with the BCM. The BCM will interpret this communication and either allow entry into the vehicle or deny it.

Body Control Module (BCM)

The BCM is a multi-function module that performs the following functions:

* Receive and authenticate active transmitter and keyless start signals from the remote control door lock receiver

* Determines the functionality requested by the transmitter signal

* Performs the function requested by the transmitter signal

Unlock Driver Door Only

Momentarily press the transmitter UNLOCK button in order to perform the following functions:

* Unlock only the driver door

* Illuminate the interior lamps for a determined length of time, or until the ignition is turned ON

* Flash the exterior lights, if enable through personalization

* Disarm the Content Theft Deterrent (CTD) system

* Deactivate the CTD system when in the alarm mode

Unlock All Doors - Second Operation

Momentarily press the transmitter UNLOCK button a second time, within 5 seconds of the first press, to perform the following function:

Unlock the remaining doors

Lock All Doors

Press the transmitter LOCK button to perform the following functions:

* Lock all vehicle doors

* Immediately turn off the interior lamps

* Flash the exterior lights, if enabled through personalization

* Chirp the horn, if enabled through personalization

* Arm the CTD system

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 transmitter rear compartment release button will open the rear compartment lid.

Vehicle Locator/Panic Alarm

A single press of the panic button performs the following functions. Some functions may be dependent on personalization settings:

* Pulses the horn three times

* Flashes the exterior lamps three times

A press and hold of the panic button performs the following functions:

* A press and hold of the panic button performs the following functions:

* Pulses the horn and flashes the parking lamps for 30 second or until the following conditions occur:

- The panic button is pressed

- The ignition switch is turned to the RUN position with a valid key