Technical Case by Rob Miller
The battery charge warning lamp may be displayed in the Instrument Cluster with Diagnostic Trouble Code (DTC) B11DB-87 stored in the Body Control Module (BCM).
This may be caused by a blown Battery Monitoring System (BMS) fused harness.
A pin-point test is available to help diagnose DTC B11DB-87. For additional information, refer to:
Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).
C1DC05A: Module-Battery monitoring system
C1DC05A-1 Green-White LIN circuit to the Central Junction Box
C1DC05A-2 Blue-Orange inline fuse fed from the positive terminal of the battery, this gives the BMS a true battery voltage direct from the battery and can monitor it sending out a signal on the LIN wire
to the GWM gateway module this then transmits a signal to the generator via a private LIN between the GWM and the Generator.
The BMS is ground through its fixings to the negative post of the battery then off to a chassis earth point.
Ensure that the power supply from the battery is present on the Blue-Orange wire.
(Contact dealer or supplier for VIN specific part number image above)
Ground Supply is present and good, if not clean BMS mating face and body/chassis earth point.
This is on the Green-White wire usually 1-volt below battery voltage.
This goes from the BMS to the Central Junction Box CJB as previously described.
Measure the voltage at the BMS connector C1DC05A-1 Green-White and then compare this reading to the one at the GWM.
The GWM connector is known as C1Y122: Module-Gateway Location Behind passenger side of Instrument panel on the Left hand inner lower A post red connector with 20 cavities.
Remove out locking cover taking note of insert position relative to the GWM and refit it.
Locate the Green -White wire at C1Y122-3 Measure the voltage here does it match that of the BMS connector?
No voltage present, check continuity and load test the wire if open circuit suspect a break in the wire examples of such break as below in the attached images.
In this instance they had to remove scuttle panel and the abs module bracket, lift abs module up out the way!
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