Diagnosing The Battery Monitoring System Before Replacement (SSM67197)

WARNING: This page is about the LR4 Base, which is a different variant/trim than selected.

Publication date: 2013-07-22
Reference number: SSM67197

DIAGNOSING THE BATTERY MONITORING SYSTEM BEFORE REPLACEMENT

TECHNICAL SERVICE BULLETIN

Reference Number(s): SSM67197, Date of Issue: July 22, 2013

LAND ROVER:	Range Rover Sport/L320; LR2/L359; Range Rover Evoque/L538; Range Rover (All New)/L405; LR4/L319; Range Rover/L322; Range Rover Sport/L494
CATEGORY:	Electrical

SERVICE INFORMATION

Symptom (203000 Basic Electrical)

ISSUE

Battery Monitoring System (BMS) are being replaced under warranty. BMS units are being tested by the supplier with the outcome being "No Fault Found".

CAUSE

BMS are being incorrectly diagnosed as faulty.

ACTION

Do not reset the BMS under any circumstances unless a new battery is fitted. Carrying out this action without replacing the battery can temporarily fix the customer's issue as the BMS learn process restarts. When the learn process is complete, the vehicle will revert back to the original state, which the customer will see as a repeat incidence of the same issue. Additionally, resetting the BMS resets the battery age counter to 0 days. This introduces inaccuracy in the BMS ageing algorithms which may cause future customer complaints.

NOTE: The BMS calculates the battery state/health by measuring battery current, battery voltage and environment temperature.

NOTE: BMS should not be replaced under warranty unless one of the following 2 DTC's are logged.

B11DB-49 Battery monitoring module internal electrical failure.

Action

Replace BMS

B11DB-87 Battery monitoring module missing message.

Action

First carry out wiring diagnostics on the BMS battery positive connections, battery negative connections and the LIN wire as per the wiring diagram in Topix. Check for continuity, short to ground and positive, also a pin drag test. Clear the DTC and retest the vehicle. If fault persists, replace BMS.