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Home >> Chevrolet >> 2012 >> Tahoe Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1581 (Antilock Brake System - Non-Hybrid Less Than 3900 Kg (8600 Lb) GVW With TCS & VSES) >> Diagnostic Information and Procedures >> DTC C0055 or P0609 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that no DTCs are set in the ECM or TCM.
  2. Ignition OFF, disconnect the harness connector at the EBCM.
  3. Ignition ON, test for greater than 10 V between the signal circuit terminal 31 and ground.
    • If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, disconnect the X 1 harness connector at the ECM.
  5. Ignition ON, verify that a test lamp does not illuminate between the signal circuit terminal 50 and ground.
    • If the test lamp illuminates, test the signal circuit for a short to voltage.
  6. If the circuit tests normal, replace the EBCM.
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