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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
  2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 7 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage.
  4. Using a DVOM verify the voltage on the signal circuit is greater than 4.8 volts.
    • If less than the specified range, test the signal circuit terminal 9 for a short to ground.
  5. Install a 3A fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal 10. Using a DVOM verify the voltage on the signal circuit is greater than 0.2 volts.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
  6. Ignition OFF, test for less than 10 ohms between the control circuit terminal 6 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.
  7. Ignition OFF, test for less than 10 ohms between the control circuit terminal 5 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.
  8. Connect a test lamp between control circuit terminal 5 and control circuit terminal 6.
  9. Command the appropriate actuator door in both directions. The test lamp should turn ON and OFF when commanded in both directions.
    • If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the HVAC control module.
  10. If both circuits test normal, test or replace the actuator.
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