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Air Recirculation Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Stepper Motors 12V Reference

B023A 02, B0223 06, B0233 06, B0408 06

B0223 06, B0233 06, B0408 06

--

--

Recirculation Actuator Control 1

B0223 06

B0223 06

B0223 01

1

Recirculation Actuator Control 2

B0223 06

B0223 06

B0223 01

1

Recirculation Actuator Control 3

B0223 06

B0223 06

B0223 01

1

Recirculation Actuator Control 4

B0223 06

B0223 06

B0223 01

1

1. Air Recirculation Malfunction

Circuit/System Description

The desired position of the recirculation flap can be set with the recirculation switch at the HVAC controls. The selected value is passed to the HVAC control module via the LIN-Bus. The HVAC control module supplies a 12 V reference voltage to the stepper motor and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motor puts the recirculation flap into the selected position.

Diagnostic Aids

Check the following mechanical fault sources:

    • Air distribution box
    • Air distribution hoses/air distribution ducts

Reference Information

Schematic Reference

HVAC Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Manual HVAC Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

  1. Ignition ON, activate and deactivate the defrost switch. Verify the scan tool Enhanced Defrost Switch parameter changes between Active and Inactive.
    2. [ARW-LISTFAIL]

  2. If the parameter does not change

    Replace the A26 HVAC Controls.

    3. [/ARW-LISTFAIL][ARW-LISTPASS]

  3. If the parameter changes

    4. [/ARW-LISTPASS]
  4. Activate and deactivate the recirculation switch. Verify the scan tool Air Recirculation Mode Switch parameter changes between Active and Inactive.
    5. [ARW-LISTFAIL]

  5. If the parameter does not change

    Replace the A26 HVAC Controls.

    6. [/ARW-LISTFAIL][ARW-LISTPASS]

  6. If the parameter changes

    7. [/ARW-LISTPASS]
  7. Replace the M46 Air Recirculation Door Actuator and verify the M46 Air Recirculation Door Actuator can be put into all positions.
    8. [ARW-LISTFAIL]

  8. If the M46 Air Recirculation Door Actuator cannot be put into all positions

    Replace the K33 HVAC Control Module.

    9. [/ARW-LISTFAIL][ARW-LISTPASS]

  9. If the M46 Air Recirculation Door Actuator can be put into all positions

    10. [/ARW-LISTPASS]
  10. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Heater and Air Conditioning Control Replacement
    •  Air Inlet Valve Actuator Replacement
    • Control Module References for HVAC control module replacement, setup, and programming
   


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