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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 439 (Lighting System) >> Diagnostic Information and Procedures >> Stop Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, observe the scan tool Brake Applied Output Signal parameter while pressing and releasing the brake pedal. The parameter should change between ON and OFF as the brake pedal is applied and released.
    • If the parameter does not change between the selected states, refer to the Brake Pedal Position Sensor Malfunction.
  2. Observe the left and right stop lamps while applying and releasing the brake pedal. The stop lamps should turn ON and OFF as the brake pedal is applied and released.
    • If the left or right stop lamps do not change between the selected states, refer to the Stop Lamp Malfunction.
  3. Observe the center high mount stop lamp while pressing and releasing the brake pedal. The center high mount stop lamp should turn ON and OFF as the brake pedal is applied and released.
    • If the center high mount stop lamp does not change between the selected states, refer to Center High Mount Stop Lamp Malfunction.
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