Test Description

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

The numbers below refer to the step numbers on the diagnostic table.

2) - Command both the ON and OFF states. Repeat the commands as necessary.
3) - This step determines if the condition is located on the coil side or the switch side of the circuit.
5) - This step determines if the body control module (BCM) is providing ground for the park lamp relay.
6) - This step determines if a ground is constantly being applied to the park lamp relay.
23) - After you replace the BCM, you must calibrate the new module for proper operation.

Fig 1: DTC B2585 Diagnosis (Steps 1-13)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B2585 Diagnosis (Steps 14-24)

Courtesy of GENERAL MOTORS CORP.