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Circuit/System Testing

WARNING: This page is about a different car, the 2013 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the K33 HVAC Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 7 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 9 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp..
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, replace the K33 HVAC Control Module.
    • If the test lamp illuminates 
  5. Ignition OFF, connect the harness connector at the K33 HVAC Control Module and disconnect the harness connector at the M4 Air Inlet Door Actuator.
  6. Connect a test lamp between control circuit terminal A and control circuit terminal B, ignition ON.
  7. Verify the test lamp illuminates for approximately 20 s when commanding the RECIRCULATE and FRESH AIR positions using the recirculate switch.
    • If the test lamp does not illuminate during either of the commands 
    1. Ignition OFF, remove the test lamp and disconnect the X1 harness connector at the K33 HVAC Control Module, ignition ON.
    2. 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
    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, replace the K33 HVAC Control Module.
    • If the test lamp illuminates during each of the commands 
  8. Test or replace the M4 Air Inlet Door Actuator.
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