Passive Start

At the request of the Body Control Module/Gateway Module (BCM/GWM) the Remote Function Actuator (RFA) prompts each of the internal Low Frequency (LF) antennas to output a signal. When the smart key is in the passenger compartment it detects the LF signals and responds with a data identification signal back to the Remote Function Receiver. The Remote Function Receiver sends the data identification signals to the RFA.

If the data received matches that stored in the RFA it continues the passive start process by communicating a 'smart key valid' signal. This signal is received by the BCM/GWM via the High Speed (HS) Controller Area Network (CAN) body systems bus.

When the BCM/GWM receives the authorization and confirms the response with an internal calculation, it passes coded data to the Instrument Cluster (IC). This data is transmitted to the IC on the HS CAN comfort systems bus. Upon confirmation from the IC the ignition is enabled.

Before BCM/GWM sends a mobilization signal to the Powertrain Control Module (PCM), it will exchange encrypted data with the Electric Steering Column Lock (ESCL) mechanism. The data will authorize the unlocking of the steering column. The IC only provides a ground for the ESCL motor.

NOTE: The Electric Steering Column Lock (ESCL) is market dependent.

The BCM/GWM will enable the fuel pump relay which provides power supply to the following:

The fuel pump on vehicles with diesel engines.
The Fuel Pump Driver Module (FPDM) on vehicles with petrol engines.

If the RFA fails to locate the smart key, a message 'Smart Key Not Recognized - Reposition Or Place As Shown And Press Start Button' will appear in the IC message center. The keyless start backup process must be used to mobilize and start the vehicle.