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Test Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. 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.

  1. 2. Listen for an audible click when the park lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Tests for voltage at the coil side of the park lamp relay.
  3. 4. Verifies that the body control module (BCM) is providing ground to the park lamp relay.
  4. 5. Tests if ground is constantly being applied to the park lamp relay.
  5. 6. Tests if there is opposing voltage present or an open park lamp relay control circuit.
  6. 12. After replacement of the BCM you must calibrate the new module for proper operation.
Fig 1: DTC B2585 - Diagnostic Chart (1 Of 2)
G01640391Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC B2585 - Diagnostic Chart (2 Of 2)
G01640392Courtesy of GENERAL MOTORS CORP.
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