Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

Interruptions to either the battery positive voltage circuit or the module ground circuit will cause the DTC to set.
This DTC may be stored as a history DTC with out affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
This DTC will never set as current during testing unless there is a non-recoverable memory failure.
If this DTC is retrieved as a current and history DTC, replace the module.

Fig 1: Diagnostic System Check - DTC B1004
Courtesy of GENERAL MOTORS CORP.