Fault Diagnosis

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

The GWM performs passive and active diagnostics on the dual battery system to determine the status of the system components.

Passive diagnostics can detect faults in the DBJB and can check for stuck open or closed contactors and failure of DBM contactor command signals.

Active diagnostics is a routine to test the capability of the contactors to respond to open or close command signals sent from the GWM to the DBM. This routine also checks the FET's (Field Effect Transistors) activate as required. (Refer to DUAL BATTERY JUNCTION BOX below for description of FET operation).

The GWM will also check the dual battery system components for faults in a controlled environment when the generator is providing a charging output. This will ensure that the detection of a fault will not result in sensitive electrical loads being subjected to low voltage which may occur during an ECO stop/start with a fault present.

The GWM will illuminate the charge warning indicator in the instrument cluster if fault is detected in the dual battery system which will result in a degraded power supply.

If a fault is detected the GWM transmits a CAN message to inhibit ECO stop/start operation. In some cases it will record a DTC, display a warning message in instrument cluster and also illuminate charge warning indicator.