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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (HVAC - Automatic) >> Diagnostic Information and Procedures >> DTC B0223, B0228, B0233, B0408, B0413, B0418, B0423, B1395, or B374A >> Circuit/System Testing

Circuit/System Testing

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DTC B1395 

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connectors.
    • M37 Mode Door Actuator
    • M46 Air Recirculation Door Actuator
    • M6L Air Temperature Door Actuator - Left
    • M6R Air Temperature Door Actuator - Right
  3. Disconnect the electrical connectors from the module.K33 HVAC Control Module
  4. Test for infinite resistance between the test points:Terminal 10X4 @ K33 HVAC Control Module & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  5. Ignition - On / Vehicle - In Service Mode
  6. Test for less than 1 V between the test points:Terminal 10X4 @ K33 HVAC Control Module & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  7. Clear All Vehicle DTCs - Ignition/Vehicle - Off
  8. Connect the electrical connectors. @ K33 HVAC Control ModuleIgnition - On / Vehicle - In Service Mode
  9. Verify DTC B1395 is not set.
    • If the DTC is set 

      Replace the component:K33 HVAC Control Module

    • Go to next step: If the DTC is not set 
  10. Connect the electrical connectors. - One at a time & Operate the component:
    • M37 Mode Door Actuator
    • M46 Air Recirculation Door Actuator
    • M6L Air Temperature Door Actuator - Left
    • M6R Air Temperature Door Actuator - Right
  11. Verify DTC B1395 is not set. 
    • If the DTC sets - Replace the component:
    • Go to next step: If the DTC does not set 
  12. All OK.

DTC B0223, B0228, B0233, B0408, B0413, B0418, B0423, B374A

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate component:
    • M37 Mode Door Actuator
    • M46 Air Recirculation Door Actuator
    • M6L Air Temperature Door Actuator - Left
    • M6R Air Temperature Door Actuator - Right
  3. Test for less than 10 ohms between the test points:Low Reference circuit terminal 2 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector:X3 @ K33 HVAC Control Module
    2. Test for less than 2 ohms between the test points:Low Reference circuit terminal 2 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K33 HVAC Control Module
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points:5 V Reference circuit terminal 3 & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X4 @ K33 HVAC Control Module
    3. Test for infinite resistance between the test points:5 V Reference circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:5 V Reference circuit terminal 3 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component:K33 HVAC Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X4 @ K33 HVAC Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:5 V Reference circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K33 HVAC Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  6. Test for 4.8 to 5.2 V between the test points:Signal circuit terminal 4 & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connectors. @ K33 HVAC Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 4 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:Signal circuit terminal 4 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K33 HVAC Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connectors. @ K33 HVAC Control Module
    3. Test for less than 1 V between the test points:Signal circuit terminal 4 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K33 HVAC Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector:X3 @ K33 HVAC Control Module
  9. Test for less than 1 V between the test points:
    • Control circuit terminal 1 @ Component harness & Ground
    • Control circuit terminal 6 @ Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  10. Ignition/Vehicle - Off
  11. Test for infinite resistance between the test points:
    • Control circuit terminal 1 @ Component harness & Ground
    • Control circuit terminal 6 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  12. Test for less than 2 ohms between the test points:
    • Control circuit terminal 1 @ Component harness & The other end of the circuit
    • Control circuit terminal 6 @ Component harness & The other end of the circuit
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  13. Replace the appropriate component:
    • M37 Mode Door Actuator
    • M46 Air Recirculation Door Actuator
    • M6L Air Temperature Door Actuator - Left
    • M6R Air Temperature Door Actuator - Right
  14. Operate the component: & Verify the DTC does not set.
    • If the DTC sets 

      Replace the component:K33 HVAC Control Module

    • Go to next step: If the repair corrected the DTC/symptom 
  15. All OK.
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