ISSUE:

Some 2010-2011 Mustang vehicles built on or before 7/26/2010 may experience electrical circuit concerns related to systems controlled by the Body Control Module B (BCM-B) following a battery disconnect. The BCM-B memory retains old circuit diagnostic trouble code (DTC) faults even after the prior repair resolved the condition. Any subsequent battery disconnects may result in the return of the original DTCs and cause the BCM-B to shut down the previously repaired circuit(s).

ACTION:

Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

The BCM-B utilizes a field-effect transistor protective circuit strategy for many of its outputs. Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down (turns off the voltage or ground provided by the module) when a fault event is detected.

U1000 sets when the BCM-B has disabled an output circuit due to a repetitive fault that overloads said circuit. A corresponding DTC for the circuit in question is also set.

For the complete Principles Of Operation refer to Workshop Manual (WSM), Section 419-10.

1. Refer to the appropriate pinpoint test in WSM, Section 419-10 and correct any Bxxx DTCs present.
2. Check the BCM-B software level using the IDS scan tool.
   1. If the BCM-B software part number suffix is -AH, -BH, or lower, program the module to the latest calibration using IDS release 71.00 or higher.
   2. If the BCM-B software part number suffix is -AJ, -BJ, or higher, do not reprogram the module since it already contains the latest software.

WARRANTY STATUS:

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

DEALER CODING