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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1012 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> Brake Warning Indicator Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the park brake is released and the brake fluid is at or above the proper level.
  2. Command the IPC display test with a scan tool, the warning indicator should turn ON.
    • If the red brake warning indicator does not illuminate, replace the IPC.
  3. Ignition ON, observe the scan tool BCM Park Brake Switch parameter while applying and releasing the park brake. The parameter should cycle between Applied and Release.
    • If the parameter does not cycle between the specified values, refer to Park Brake Switch Malfunction below.
  4. Observe the scan tool IPC Brake Fluid parameter. The reading should be OK.
    • If not the specified value, refer to Brake Fluid Level Switch Malfunction below.
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