Description And Operation: Operation

At the request of the Central Junction Box (CJB) the Keyless Vehicle Module (KVM) prompts each of the internal low frequency antennas to output a signal. When the smart key is in the vehicle cabin, it detects the low frequency signals and responds with a Radio Frequency (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 CJB via the Medium Speed (MS) Controller Area Network (CAN) body bus.

Once the CJB receives the authorization and confirms the response with an internal calculation, it passes coded data to the Instrument Cluster (IC) on the High Speed (HS) Controller Area Network (CAN) powertrain bus. Upon confirmation from the IC the ignition is enabled.

Before CJB sends a mobilization signal to the Engine Control Module (ECM), it will exchange encrypted data with the electric steering lock mechanism to authorize unlocking of the steering column. The IC only provides a ground for the steering lock motor.

NOTE: Electric Steering Column Lock is market dependent.

The CJB 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 Fuel Pump Driver Module (FPDM) to operate the fuel pump in conjunction with the ECM.

If the KVM fails to locate the smart key, a message 'SMART KEY NOT FOUND REFER TO HANDBOOK' 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.