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Home >> Cadillac >> 2014 >> ELR >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> DTC B0223, B0233, B023A, or B0408: Recirculate Position Command 1/Air Flow Control/Main Temperature Control >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle OFF, disconnect the harness connector at the appropriate door actuator, vehicle in Service Mode.
  2. Connect a test lamp between the B+ circuit terminal 2 and ground.
  3. Verify the test lamp turns ON then OFF when commanding the appropriate actuator listed below ON but not OFF with a scan tool.
    • Mode Door Position
    • Air Recirculation Door Actuator Direction
    • Left Temperature Door Actuator Direction
    • If the test lamp is always OFF 
    1. Vehicle OFF, disconnect the X3 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 test lamp is always ON 
    1. Vehicle OFF, disconnect the harness connector at the K33 HVAC control module, vehicle in Service Mode.
    2. Test for less than 1 V between the control 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 the test lamp turns ON then OFF 
  4. Vehicle OFF, disconnect the X3 harness connector at the K33 HVAC control module, vehicle in Service Mode.
  5. Test for less than 1 V between each control circuit terminal listed below and ground.
    • Control Circuit - terminal 1
    • Control Circuit - terminal 3
    • Control Circuit - terminal 4
    • Control Circuit - terminal 6
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  6. Vehicle OFF.
  7. Test for infinite resistance between each control circuit terminal listed below and ground.
    • Control Circuit - terminal 1
    • Control Circuit - terminal 3
    • Control Circuit - terminal 4
    • Control Circuit - terminal 6
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If Infinite resistance 
  8. Test for less than 2 Ω in each control circuit listed below end to end.
    NOTE:

    See schematic for the K33 HVAC control module terminal numbers.

    • Control circuit terminal 1
    • Control circuit terminal 3
    • Control circuit terminal 4
    • Control circuit terminal 6
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  9. Test or replace the actuator.
  10. Verify the DTC does not set and the correct door position is achieved while operating the HVAC system under the Conditions for Running the DTC.
    • If the DTC sets or door position is incorrect 

      Replace the K33 HVAC control module.

    • If the DTC does not set and door position is correct 
  11. All OK.
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