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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1158 (Power Steering System) >> Diagnostic Information and Procedures >> DTC C0450 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the VES actuator.
  2. Ignition ON, verify that a test lamp illuminates between the high effort control circuit terminal A and ground.
    • If the test lamp does not illuminate, test the high effort control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
  3. Verify that a test lamp illuminates between control the low effort control circuit terminal B and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
  4. If all circuits test normal, test or replace the VES actuator.
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