Manual:LAND ROVER Range Rover Supercharged 2015Page:43365 / 73010



Battery Monitoring System — 2015 Land Rover Range Rover Supercharged Service Manual

Battery Monitoring System

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The Battery Monitoring System (BMS) control module is located on the battery negative terminal, and connected to the BCM/GWM assembly via a LIN bus connection. The BMS module contains software maps that provide a mathematical model of battery conditions, and constantly receives information from the BCM/GWM assembly regarding the vehicle state and electrical loading.

The BMS control module monitors various battery parameters, which are directly measured and predictive values:

  • Battery current and voltage are the result of direct measurement;
  • While state of charge, state of function and electrolyte temperature are predicted values.

These signals are used by both the charging system and the Auto stop/start system to ensure the vehicle functions are optimized. The measurement is autonomous and happens in all states to enable an accurate condition of the battery to be assessed at all times. Software based values are calculated and used as a backup in the event of a system fault condition. If any of the measured/predicted values do not meet the necessary thresholds, the Auto stop/start feature will be suspended until the thresholds are met. In the case of a fault condition, the Auto stop/start system will be disabled for the duration of the particular drive cycle. Diagnostic Trouble Codes (DTC)'s relating to faults will be stored in the BCM/GWM assembly.

The BMS control module also has a hardwired connection to the battery positive terminal. This connection is used to avoid any potential voltage drop in the circuit which results incorrect information received by the BMS control module. If this connection becomes open, the BCM/GWM assembly detects a communication loss with the BMS control module. Then the BCM/GWM assembly default to a fail-safe fixed charging voltage of 14 Volts, stores a related DTC, and sends a message to the Instrument Cluster (IC) via the High Speed (HS) Controller Area Network (CAN) comfort systems bus to illuminate the charge warning indicator. For additional information, refer to: INSTRUMENT CLUSTER .