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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 476 (Antilock Brake System - Hybrid (Hp2)) >> Diagnostic Information and Procedures >> DTC C0201, C120D, or C120E >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Test for less than 1 Ω between the ground circuits listed below and ground.
    • Terminal 13
    • Terminal 38
      • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground.
    • Terminal 1
    • Terminal 25
    • If the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the brake pressure modulator valve assembly.
  4. If all circuits test normal, replace the EBCM and verify DTC does not reset. If the DTC resets, replace the brake pressure modulator valve assembly.
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