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Home >> Chevrolet >> 2012 >> Tahoe PPV >> Repair and Diagnosis >> External Pages >> Different car >> Section 1327 (Antilock Brake System - Non-Hybrid Less Than 3900 Kg (8600 Lb) GVW) >> Diagnostic Information and Procedures >> DTC C0455 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTC C1100, or C0710 is not set.
  2. Ignition OFF, disconnect the harness connector at the steering angle sensor.
  3. Test for less than 20 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  4. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and the signal circuit terminal 6.
    • If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  6. Ignition OFF, disconnect the harness connector at the EBCM.
  7. Test for infinite resistance between the signal circuit terminal 4 and ground.
    • If less than the specified range, test the signal circuit for a short to ground.
  8. Connect the harness connector at the EBCM.
    9. NOTE: When measuring voltage, the voltage values are based on a battery charge of 12.5 V and the steering wheel is in the center position.
  9. Ignition ON, at the steering angle sensor connector harness, test for 6.8 - 11 V between the signal circuit terminals listed below and ground.
    • Phase A terminal 3
    • Phase B terminal 4
    • Phase C terminal 5
    • If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  10. If the circuits test normal, replace the steering angle sensor.
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