Keyless Entry System Description and Operation (Without ATH)
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Keyless Entry System Description and Operation (Without ATH)
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The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the body control module (BCM) to remotely activate certain vehicle features. Keyless entry will lock/unlock the doors/liftgate, operate the power liftgate (if equipped), or release the liftglass when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the BCM. The BCM interprets the signal and performs the requested function. A low transmitter or vehicle 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 may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following components:
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Power liftgate, if equipped
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Remote vehicle starting, if equipped
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Illuminated entry lamps
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Vehicle locator/Panic alarm
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Comfort Open and Comfort Close, if equipped
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The keyless entry system has the following components:
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Keyless Entry Transmitters
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Keyless Entry Transmitters
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The keyless entry transmitters are used to lock and unlock the vehicle door while away from the immediate are of the vehicle. Vehicles without remote vehicle start will operate at a distance of up to 20 m (65 ft) away, except for Japanese and South Korean vehicles, which are limited to 4 m (16 feet). Vehicles with remote vehicle start will operate at a distance of up to 60 m (195 ft) away. Up to 8 transmitters may be programmed to a single vehicle.
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Body Control Module (BCM)
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The BCM is a multifunction module that operates the keyless entry system. When an radio frequency message is received from a keyless entry transmitter, the BCM interprets this signal and performs the specific function, i.e. door lock, door unlock, or vehicle locate.
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 enabled through personalization.
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Disarm the content theft deterrent (CTD) system, if equipped.
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Deactivate the CTD system when in the alarm mode.
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Unlock All Doors - Second Operation
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Momentarily press the transmitter UNLOCK button a second time, within 5 seconds of the first press, to perform the following functions:
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Unlock the remaining doors.
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Unlock the liftgate, if equipped.
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Press the transmitter LOCK button to perform the following functions:
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Lock all vehicle doors.
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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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Arm the CTD system, if equipped.
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Liftglass Release, if equipped
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Press the transmitter liftglass release button to perform the following function:
Open the liftglass.
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Power Liftgate, if equipped
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Press and hold the power liftgate button to perform the following functions:
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Open or close the liftgate using the power liftgate function.
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Sound the interior power liftgate chime.
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Vehicle locator/Panic alarm
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A single press of the panic button performs the following functions. Some functions may be dependent on personalization settings:
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Pulse the horn 3 times.
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Flash the exterior lamps 3 times.
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A press and hold of the panic button performs the following functions:
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Illuminate the interior lamps.
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Pulse the horn and flash the exterior lamps for 30 seconds or until the following conditions occur:
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The panic button is pressed.
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The ignition switch is turned to the RUN position with a valid key.
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Comfort Open and Comfort Close, if equipped
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Holding down the appropriate button on the transmitter will perform the following functions:
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Open all vehicle windows
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Close all vehicle windows
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Remote vehicle starting, if equipped
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The remote vehicle start function allows engine starting while not in the vehicle. It also allows the vehicle HVAC system and other vehicle systems to enable, providing a comfortable vehicle upon entry. Remote vehicle start functions have an operating range of up to 59 m(195 feet), depending on conditions. The remote vehicle start sequence begins by pressing and releasing the lock button and then within 3 seconds, pressing and holding the remote vehicle start buttons on the keyless entry transmitter. The turn signal lamps will flash to indicate the vehicle has received the remote start request. Each time a remote vehicle start is performed, the vehicle doors are locked, however they may then be unlocked/locked with the transmitter or vehicle key at any time. Once activated, the engine is allowed to run for 10 minutes. The remote vehicle start time may be extended by an additional 10 minute by again pressing and releasing the lock button and then pressing and holding the remote vehicle start buttons on the transmitter. This feature is called a remote vehicle start continue and allows a maximum of 20 minutes of engine running. If the remote vehicle start continue is performed at 7 minutes into the initial 10 minute time-out, a total of 17 minutes of engine running would occur. The remote vehicle start event may be suspended at any time by pressing only the remote vehicle start button on the transmitter or by entering the vehicle and turning ON the hazard lamps.
In between ignition cycles, only 2 remote vehicle start events may occur or be attempted. Once 2 events or attempts have been made, future remote vehicle start events will be suspended until the vehicle is started using the ignition.
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Enable/Disable Remote Vehicle Start
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Using the driver information center, remote vehicle start may be enabled or disabled as a part of vehicle personalization. Refer to the vehicle owners manual for more information.
The hood switch provides status of the hood to the BCM for remote vehicle start purposes. The switch is integrated into the hood latch assembly. The hood ajar switch provides 2 separate inputs to the BCM. These separate inputs allow the BCM to actively monitor for a hood ajar switch fault.
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Remote Vehicle Start Circuit Description
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The BCM receives a signal from the keyless entry transmitter indicating a remote vehicle start request. A message is then sent to the BCM which determines if a crank request message will be sent to the ECM to allow engine starting. To determine if conditions are correct for an remote vehicle start event, the BCM will ensure the following conditions are met:
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The transmitter is not in the vehicle.
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Coolant temperature is not too high.
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Two remote vehicle start periods has not been used.
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No emission control system malfunktion.
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All vehicle doors are closed.
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A valid hood ajar switch closed signal is present.
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The hazard switch is OFF.
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Vehicle power mode is correct.
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No content theft deterrent (CTD) alarm triggers are present.
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The vehicle is not in valet mode, if equipped.
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When the BCM determines all conditions meet those required for an remote vehicle start event, a message is sent via serial data to the ECM. The ECM relies on the remote vehicle start message from BCM to enable remote vehicle start when the crank request signal is received. If the ECM does not receive a valid remote vehicle start message, it will not attempt to start the engine. While the ECM is in remote vehicle start mode it will suspend engine operation if any of the following additional conditions occur:
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Vehicle speed is greater than 0.
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Transmission is not in PARK.
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Excessive engine coolant temperature
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The malfunction indicator lamp (MIL) is commanded ON.
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Engine crank time is greater than 30 seconds.
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Excessive engine speed.
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Accelerator pedal position too high.
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Remote start timer equals 0.
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Immobilizer system indicates tamper
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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 personalization instructions, refer to the vehicle owners manual.
