Battery Monitoring System

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The battery monitoring system module measures battery current and voltage, which it communicates to the CJB (central junction box) over a LIN (local interconnect network) bus connection. The CJB transmits the battery information to the instrument cluster over the medium speed CAN (controller area network) bus. The instrument cluster acts as a gateway between the medium and high speed CAN bus networks, and transmits the battery condition information to the ECM (engine control module) over the high speed CAN bus. Based on the information received from the battery monitoring system module, the ECM will control the output from the generator and request the switching off of electrical loads if necessary.

For additional information, refer to: Generator (Description and Operation).

CAUTION: Due to the self-calibration routine, it is recommended that all power supply diagnostic testing is carried out using the Jaguar approved diagnostic system rather than a digital multimeter.

The battery monitoring system module is able to generate DTC (diagnostic trouble code)'s to help diagnose battery or generator power supply issues. These DTC's can be read using the Jaguar approved diagnostic system. The Jaguar approved diagnostic system can also be used to implement a battery and generator self test routine.

For additional information, refer to: Battery (DIAGNOSIS AND TESTING).

If a fault is detected, the ECM will override the battery monitoring system module.

The battery monitoring system module DTC's can be used to help diagnose battery or generator power supply faults. The DTC's are stored in both the CJB and the ECM. The Jaguar approved diagnostic system has a process for an automated power supply diagnostic procedure. The procedure provides a menu driven process to locate a fault in a logical sequence. The procedure uses the capability of the battery monitoring system and generator LIN bus controlled functions to provide current flow information and will detect if the battery monitoring system or generator are functioning correctly.