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.

3. Tests for voltage at the voltage supply side of the low beam headlamp driver module.
4. Verifies that the body control module (BCM) is providing PWM ground to the low beam headlamp driver module.
5. Tests if ground is constantly being applied to the low beam headlamp driver module.
6. Tests if there is opposing voltage present or an open low beam headlamp driver module control circuit.
12. After replacement of the BCM you must calibrate the new module for proper operation.

Fig 1: DTC B2575 - Diagnostic Chart (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B2575 - Diagnostic Chart (2 Of 2)

Courtesy of GENERAL MOTORS CORP.