Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

2) - OFF is the normal state of the switch before activation.
4) - OFF is the normal state of the switch before activation.
5) - This step tests for a short to ground on the front fog lamp switch signal circuit.
6) - After replacement of the BCM you must calibrate the new module for proper operation.

Fig 1: DTC B2527 Diagnosis

Courtesy of GENERAL MOTORS CORP.