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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the VES actuator harness connector.
  2. Measure for 0 volts between the variable effort steering actuator supply voltage circuit and ground.
    • If over 0 volts, test the variable effort steering actuator supply voltage circuit for short to voltage. If the circuit tests normal, replace the EBCM.
  3. Ignition ON, measure for 12 volts between the variable effort steering actuator supply voltage circuit and ground.
    • If under 12 volts, test the variable effort steering actuator supply voltage circuit for short to ground or open/high resistance. If the circuit tests normal, replace the EBCM.
  4. Connect a test lamp between the variable effort steering actuator supply voltage circuit and the variable effort steering actuator control circuit at the VES actuator harness connector.
  5. Using a scan tool, command the VES actuator ON. Verify the test lamp illuminates.
    • If the test lamp does not illuminate, test the variable effort steering actuator control circuit for open/high resistance. If the circuit tests normal, replace the EBCM.
  6. If all circuits test normal, test or replace the VES actuator.
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