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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> DTC B0223, B0233, B023A or B0408: Recirculate Position Command/Air Flow Control/HVAC Actuators/Main Temperature Control >> Circuit/System Testing >> B023A

Circuit/System Testing: B023A

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the components listed below. It may take up to 2 min for all vehicle systems to power down.
    • M37 Mode Door Actuator
    • M46 Air Recirculation Door Actuator
    • M6 Air Temperature Door Actuator
  2. Disconnect the harness connector at the K33 HVAC Control Module.
  3. Test for infinite resistance between the K33 HVAC Control Module 12 V reference circuit terminal 15 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  4. Ignition ON.
  5. Test for less than 1 V between the K33 HVAC Control Module 12 V reference circuit terminal 15 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  6. Connect the harness connector at the K33 HVAC Control Module, ignition ON.
  7. Clear all DTCs.
  8. Verify DTC B023A is not set.
    • If the DTC is set. 

      Replace the K33 HVAC Control Module.

    • If the DTC is not set. 
  9. Verify DTC B023A does not set after connecting each of the components listed below one at a time and operating them through their full range.
    • M37 Mode Door Actuator
    • M46 Air Recirculation Door Actuator
    • M6 Air Temperature Door Actuator
    • If the DTC sets after connecting one of the components 

      Replace the component that was connected immediately before the DTC set.

    • If the DTC does not set 
  10. All OK.
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