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Circuit/System Testing

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  1. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
  2. Disconnect the harness connector at the M46 Air Recirculation Door Actuator.
  3. Test for less than 10 Ω between the low reference circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module.
    2. Test for less than 2 Ω in the low reference 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 less than 10 Ω 
  4. Ignition ON.
  5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 2 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module.
    2. Test for infinite resistance between the 5 V reference 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 5 V reference 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 greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K33 HVAC Control Module.
    • If between 4.8 - 5.2 V 
  6. Test for 4.8 - 5.2 V between the signal circuit terminal 6 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module.
    2. Test for infinite resistance between the signal 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 signal 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 greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K33 HVAC Control Module.
    • If between 4.8 - 5.2 V 
  7. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module, ignition ON.
  8. Test for less than 1 V between each control circuit listed below and ground:
    • M46 Air Recirculation Door Actuator terminal 1
    • M46 Air Recirculation Door Actuator terminal 5
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  9. Ignition OFF.
  10. Test for infinite resistance between each control circuit listed below and ground:
    • M46 Air Recirculation Door Actuator terminal 1
    • M46 Air Recirculation Door Actuator terminal 5
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  11. 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 
  12. Test or replace the M46 Air Recirculation Door Actuator.
    NOTE: Before replacing an actuator, verify that there are no mechanical issues with the air control door and any associated components.
  13. Verify the M46 Air Recirculation Door Actuator moves between the RECIRCULATE and FRESH AIR position within 20 s when pressing the recirculation switch.
    • If the M46 Air Recirculation Door Actuator does not move between the RECIRCULATE and FRESH AIR position 

      Replace the K33 HVAC Control Module.

    • If the M46 Air Recirculation Door Actuator moves between the RECIRCULATE and FRESH AIR position 
  14. All OK.
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