Power Door Latch Description and Operation
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Power Door Latch Description and Operation
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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, operate the power lift gate (if equipped), release the lift glass (if equipped) 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:
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Rear compartment lid release
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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 only have the transmitter with you. This passive system is also part of the vehicle starting system. It allows you to start and run the vehicle having only the transmitter as your key. The passive entry and starting system use 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 lid, you must have a programmed transmitter with you in your pocket, purse, or briefcase. As a customer opens the door handle or presses the rear compartment touch pad, the low frequency antenna sends out a challenge to the keyless entry transmitter. The transmitter should be in a one meter range of the door or rear compartment lid in order to receive the challenge. If the challenge is met, the transmitter will respond, allowing the door to be unlocked and opened. Passive entry allows you to operate the following features:
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Passive door unlock/unlatch and lock
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Passive rear compartment lid release
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Upon transition to the closed position or from one or more doors open to all doors closed, the vehicle horn beeps three times if the key is still inside the vehicle. The next time a door is opened, a message is shown in the driver information center and a chime will sound in the front compartment.
Lock-out deterrent in inactive mode when one or more doors is opened: Press the interior lock button and close all doors: If the key fob is still in the vehicle, the driver door unlocks.
The keyless entry system has the following components:
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Keyless entry integrated key/transmitter
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Driver and front Passenger door antennas (part of the door handle assembly)
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Driver and front Passenger door lock sensors (part of the door handle assembly)
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Keyless Entry Control Module
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Remote Control Door Lock Receiver
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Keyless Entry Transmitters
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The keyless entry transmitters are used to passively:
Lock, unlock, release trunk, and start vehicle.
The keyless entry transmitters are used to actively:
Lock, unlock, locate vehicle via panic/locator, release trunk, and remote start vehicle.
By operating any of the exterior door handles, a nearby programmed transmitter is challenged by a keyless entry antenna. The transmitter will passively send a request to the BCM. The BCM will interpret this communication and either allow entry into the vehicle or deny it.
This is accomplished by the transmitter sending a radio frequency to the antenna that has a direct link to the 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.
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Keyless Entry Control Module (PEPS)
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The Keyless Entry Control Module (PEPS) is a multi-function module which performs the following passive keyless entry functions:
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Transmitting vehicle antennas for passive keyless entry functions
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Backup control for the ECM accessory wakeup and the run/crank relay
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If equipped, acts as the low side driver for the electronic steering column lock
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Receiver of the door handle switch inputs and the lock sensor inputs and door open switch (not the door ajar switch)
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Driver for the unlatch motors - happens when the BCM unlatch enable signal is active and when the appropriate door handle is pulled
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Start/stop button/switch is an input to the PEPS
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The BCM is a multi-function module that performs the following functions:
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Receive active and passive signals from fobs
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Authenticates the active and passive signals from the integrated key/transmitter
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Determines the functionality requested by the fob signal
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Performs the function requested by the fob signal
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Unlock Driver Door Only - Active
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Momentarily press the transmitter UNLOCK button in order to perform the following functions:
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Unlock only the driver door
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Illuminate the interior lamps for a determined length of time, or until the ignition is turned ON
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Flash the exterior lights, if enable through personalization
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Disarm the Content Theft Deterrent (CTD) system
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Deactivate the CTD system when in the alarm mode
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Unlock All Doors - Second Operation - Active
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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
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Unlock Driver Door Only - Passive
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If enabled through personalization, approach the driver door with a valid keyless entry transmitter and pull the door handle to perform the following functions:
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Unlock and open only the driver door when door handle is operated
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Disarm the CTD system, if equipped
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Deactivate the CTD system when in the alarm mode
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Unlock All Doors - Passive
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Approach any non driver door (front or rear) or if enabled through personalization, driver door with a valid keyless entry transmitter to perform the following functions:
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Unlock all vehicle doors when the approached door handle is operated
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Only opens door whose door handle is pulled
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Disarm the CTD system, if equipped
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Deactivate the CTD system when in the alarm mode
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Press the transmitter LOCK button to perform the following functions:
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Immediately turn off the interior lamps
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Flash the exterior lights, if enabled through personalization
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Chirp the horn, if enabled through personalization
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Exit the vehicle (with ignition off) with the keyless entry transmitter to automatically perform the following functions, if equipped.
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Lock all vehicle doors after a delay
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Flash the exterior lights, if enabled through personalization
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Chirp horn, if enabled through personalization
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When all doors are closed, they can also be locked from the exterior by touching the lock sensor on the outside of a front door handle while having a valid transmitter in range. This function is only active for several minutes after all doors are closed to save battery life.
If more than one keyless entry transmitter is within a vehicle and the Keyless Entry System detects that one or more transmitters have been left in the vehicle after vehicle is locked, any transmitter left within the vehicle will be temporarily deactivated until:
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A button on the deactivated key fob is pressed (will only activate the fob whose button is pressed)
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A passive unlock of vehicle occurs
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Change in power mode occurs
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Keyless Entry Personalization
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Vehicle lock/unlock functions and remote vehicle start settings may be personalized for the vehicle. For functional descriptions and programming instructions, refer to the vehicle owners manual.
