Anti-Theft - Passive: Operation: Notes

WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

At the request of the BCM/GWM the KVM prompts each of the internal LF antennas to output a signal. When the smart key is in the vehicle cabin, it detects the LF signals and responds with a RF data-identification signal back to the KVM via the RF receiver.

If the data received matches that stored in the KVM, it continues the passive start process by communicating a 'smart key valid' signal to the BCM/GWM via the MS CAN body systems bus.

Once the BCM/GWM receives the authorization and confirms the response with an internal calculation, it passes coded data to the IC on the HS (High Speed) CAN powertrain systems bus. Upon confirmation from the IC the ignition is enabled.

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

NOTE: Electric Steering Column Lock is market dependent.

The BCM/GWM will enable the fuel pump relay which, on diesel vehicles operates the fuel pump and on gasoline vehicles sends a battery voltage supply to the FPDM (Fuel Pump Driver Module) to operate the fuel pump in conjunction with the ECM.

If the KVM fails to locate the smart key, a message 'SMART KEY NOT RECOGNISED, REPOSITION OR PLACE AS SHOWN AND PRESS START BUTTON' will appear in the IC message center and the keyless start back-up process will have to be used to mobilize and start the vehicle.

To ensure optimum long term reliability of the smart key the battery must be replaced with a brand new, unused battery. If a used battery is installed the "SMART KEY BATTERY LOW" message may not be cleared. To avoid contamination of the contacts the battery should be removed from its packaging and installed into the smart key while wearing gloves. To confirm that the replacement battery is working correctly press the unlock button twice while holding the smart key outside the vehicle, then enter the vehicle with the smart key, press the start button and confirm that the "SMART KEY BATTERY LOW" message is not displayed.