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Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the M4 Air Inlet Door Actuator.
  2. Connect a test lamp between control circuit terminal A and control circuit terminal B, ignition ON.
  3. Verify the test lamp turns ON for approximately 10 s when commanding the Air Recirculation Mode Switch On and Off with a scan tool.
    • If the test lamp does not turn ON and OFF during either of the commands 
    1. Ignition OFF, remove the test lamp and disconnect the X3 harness connector at the K33 HVAC Control Module, ignition ON.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for infinite resistance between the control circuits.
      • If less than infinite resistance, repair the short on the circuit.
      • If infinite resistance
    5. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K33 HVAC Control Module.
    • If the test lamp turns ON and OFF during each of the commands 
  4. Test or replace the M4 Air Inlet Door Actuator.
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