Test Description

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

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

Fig 1: DTC B2575 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B2575 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.