Diagnosing The BMS When DTC B11DB-87 Is Logged (SSM71978)

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

Publication date: 2014-09-11
Reference number: SSM71978

DIAGNOSING THE BMS WHEN DTC B11DB-87 IS LOGGED

TECHNICAL SERVICE BULLETIN

Reference Number(s): SSM71978, Date of Issue: September 11, 2014

LAND ROVER:	Discovery 4/L319, Freelander 2/L359, Range Rover/L405, Range Rover Sport/L494, Range Rover Evoque/L538
CATEGORY:	Electrical

SERVICE INFORMATION

Symptom 203000 Basic Electrical

ISSUE

Content

A significant number of BMS (Battery Monitoring System) modules have been replaced when DTC B11DB-87 is logged, when returned to the supplier for analysis many are deemed as "No Fault Found"

CAUSE

Incorrect diagnosis

ACTION

If a vehicle is presented with DTC B11DB-87 logged follow the diagnostic routine below before replacing the BMS module:-

NOTE: If DTC B11DB-87 is flagged but a "charge system fault" warning/light is not present on the cluster, then the BMS is not the causal part.

a. If only DTC B11DB-87 is present then go to Step 4
b. If DTC B1412-87 (Quiescent Current Control Module - missing message) is also present, check the continuity of GWM LIN_1 circuit and rectify as required. Go to Step 2.
Clear DTCs and re-test vehicle (vehicle must have the ignition on or engine running for a minimum of 20secs before the re-test). Go to Step 3.
a. If only B11DB-87 is still present go to Step 4.
b. If only B1412-87 is still present, investigate the QCCM.

c. If both DTCs are still present, investigate the GWM (Gate Way Module).
a. Check BMS is seated correctly on battery post (it should slightly protrude from ring)
b. Check BMS power (thin wire from positive terminal) is securely connected to positive terminal with no wiring damage.

c. Check BMS for plug/harness disconnect and security of wires into the back of the plug.

d. Disconnect the BMS and LIN plug and visually check pins in both ends for damage and rectify as required.
Clear DTCs and re-test the vehicle as per Step 2.
If DTC B11DB-87 is still present, replace the BMS.