Diagnostic Aids

If the DTC B2665 is a history DTC, the fault may be intermittent. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
An intermittent short to ground in the following locations may cause an intermittent malfunction to occur:
- The headlamps signal circuit of the headlamp switch
- The headlamp switch
- The BCM
Fig 1: DTC B2665 Diagnosis
Courtesy of GENERAL MOTORS CORP.