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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 X1 harness connector at the K33 HVAC Control Module.
  2. Install a 3 A jumper wire between the signal circuit terminal 5 and ground, A/C switch depressed.
  3. Verify the scan tool ECM A/C Request Signal parameter changes between YES and NO.
    • If the parameter does not change 
    1. Ignition OFF, remove the jumper wire and disconnect the X2 harness connector at the K33 HVAC Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 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 parameter changes 
  4. Replace the K33 HVAC Control Module.
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