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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> Brake Warning Indicator Inoperative >> Circuit/System Testing

Circuit/System Testing

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  1. With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel lamps ON. Verify brake lamp turns ON.
    • If the brake lamp does not turn ON, replace the IPC.
  2. Release the park brake. Disconnect the brake fluid level switch. Connect a 3-amp jumper wire between the signal circuit of the brake fluid level switch and the ground circuit of the brake fluid level switch. Ignition ON, verify the brake lamp is ON.
    • If the brake lamp does not turn ON, test the signal circuit and ground circuit for a high resistance/open or replace the brake fluid level switch.
  3. Disconnect the park brake switch. Connect a 3-amp jumper wire between signal circuit of the park brake switch and ground. Ignition ON, verify the Red Brake Warning indicator is ON.
    • If the Red Brake Warning indicator dose not turn ON, test the signal circuit high resistance/open or replace the BCM.
  4. Replace the park brake switch.
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