Keyless Entry System Description and Operation: Notes

Solid line - Hard Wire I/O  Dash line - Serial Data
K9	Body Control Module (BCM)
K77	Remote Control Door Lock Receiver
T10	Keyless Entry Antenna
15	Keyless Entry Transmitter
With RPO ATH
A23D	Door Latch - Driver
A23LR	Door Latch - Left Rear
A23P	Door Latch - Passenger
A23RR	Door Latch - Right Rear
K84	Keyless Entry Control Module
T10G	Keyless Entry Antenna - Rear Fascia
T10M	Keyless Entry Antenna - Driver Door Handle
T10N	Keyless Entry Antenna - Passenger Door Handle
With RPO BTM
T10E	Keyless Entry Antenna - Rear Compartment
T10J	Keyless Entry Antenna - Center Console Front
T10K	Keyless Entry Antenna - Center Console Rear

Keyless Entry System Description and Operation - Active 

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
• Liftgate lock/unlock (Hatchback and Wagon)
• Trunk release (Notchback)
• Illuminated entry lamps
• Panic alarm/Vehicle locator

Keyless Entry System Description and Operation - Passive 

Passive keyless entry allows entry to a locked vehicle without pressing any buttons on the keyless entry transmitter. You must have the transmitter with you. The passive entry system uses low frequency antennas in several different areas on the vehicle to determine the location of the transmitter. When passively opening a locked door or the rear compartment, you must have a programmed transmitter with you in your pocket, purse, or briefcase within a one meter range.

When an exterior door handle button is pressed or the rear compartment touch pad is pressed, the keyless entry control module activates the low frequency antenna which sends out a challenge to the keyless entry transmitter. Because of the low frequency, communication range is limited. The antenna will emit the challenge in a one meter range. The transmitter must be within this range to receive the challenge. The transmitter receives this challenge and emits it's response as an RF message, which is received by the remote control door lock receiver. If the response is correct, entry into the vehicle will be allowed.

As a customer convenience feature, the keyless entry system will notify the driver if the transmitter has been left in the vehicle after exiting by chirping the vehicle horn three times. This may be turned off using vehicle personalization. Also, if the transmitter is left in the vehicle after the central door lock switch has been used to lock the vehicle, the driver door will remain unlock after exiting the vehicle. This is intended to prevent locking the transmitter in the vehicle and being unable to access it.

Keyless Entry System Description and Operation - Keyless Start 

The keyless start portion of the keyless entry system allows vehicle starting, having only the transmitter as your key. The keyless start system uses low frequency antennas in three different locations on the vehicle to determine the location of the transmitter. Multiple antenna are used to ensure complete coverage of the vehicle interior and rear compartment. When using the keyless start system, a programmed transmitter must be in the vehicle's interior, in the driver's pocket, purse, or briefcase.

When the ignition mode switch is pressed, the low frequency antennas emit a challenge to the keyless entry transmitter. The transmitter receives this challenge and emits it's response as an RF message, which is received by the remote control door lock receiver. If the response is correct, vehicle starting will be allowed. If RF communication is interrupted, a "No Remote Detected" message will be displayed on the DIC. In these cases, the transmitter can be placed in the transmitter pocket located in the center console. The immobilizer antenna coil is located directly beneath the transmitter pocket. Placing the transmitter in the pocket will create a low powered coupling between the transmitter and immobilizer antenna, allowing communications to occur and enabling vehicle starting.

The keyless entry system has the following components:

• Keyless entry integrated key/transmitter
• Driver and front passenger door antennas (part of the door handle assembly)
• Driver and front passenger door handle switches (part of the door handle assembly)
• Rear fascia antenna
• Front console antenna
• Rear console antenna
• Trunk antenna (rear compartment)
• Body control module (BCM)
• Keyless entry control module
• Immobilizer antenna coil assembly
• Remote control door lock receiver