Diagnostic Aids

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

A DTC B0846 can be the result of a short to ground in an adjuster motor or control circuit, first diagnose a DTC B2002, B2007, or B2012, if present.
Inspect the battery and charging system for proper operation.
If the fault is not current, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.