Diagnostic Aids

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

If the DTC B2613 is a history DTC, the fault may be intermittent. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
An intermittent condition in the following locations may cause an intermittent malfunction to occur:
- The 12-volt reference circuit of the IP dimmer switch, the signal circuit of the IP dimmer switch, or the low reference circuit of the IP dimmer switch
- The IP dimmer switch
- The BCM
Fig 1: DTC B2613 Diagnosis (Steps 1-4)
Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B2613 Diagnosis (Steps 5-12)
Courtesy of GENERAL MOTORS CORP.