Passive Start System

At the request of the Body Control Module/Gateway Module (BCM/GWM) sends a signal to the Remote Function Actuator (RFA). The 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. The smart key 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 through the High Speed (HS) Controller Area Network (CAN) body systems bus.

The BCM/GWM receives the authorization and confirms the response with an internal calculation. The BCM/GWM passes coded data to the Instrument Cluster (IC) on the HS CAN comfort systems bus. Upon confirmation from the IC, Power Mode 6 (ignition ON) is enabled.

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

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

The BCM/GWM enables the fuel pump relay which provides a startup battery voltage supply to the following:

The fuel pump module 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 is displayed in the IC message center. The message is 'Smart Key Not Recognized - Reposition Or Place As Shown And Press Start Button.

The keyless start backup process must be used to mobilize and start the vehicle.