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Air Delivery Improper

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

--

--

Mode Door Actuator Control 1

B0233 06

B0233 06

B0233 01

1

Mode Door Actuator Control 2

B0233 06

B0233 06

B0233 01

1

Mode Door Actuator Control 3

B0233 06

B0233 06

B0233 01

1

Mode Door Actuator Control 4

B0233 06

B0233 06

B0233 01

1

1. Air Distribution Malfunction

Circuit/System Description

With the defrost switch, air to foot well switch, air to windscreen switch and the air to head area switch at the HVAC controls, the desired air distribution flap position can be put in. The selected value is passed over the LIN-Bus to the HVAC control module. The HVAC control module supplies a 12 V reference voltage to the stepper motor and energises the 4 stepper motor coils with a pulsed ground signal. The stepper motor puts the air distribution flap into the selected position.

Diagnostic Aids

Check the following mechanical fault sources:

    • Air distribution box
    • Air distribution hoses/air distributing 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, press and release the switch for air distribution to head. Verify the scan tool Front 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. Press and release the switch for air distribution to face. Verify the scan tool Instrument Panel Vents 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. Press and release the switch for air distribution to floor. Verify the scan tool Floor Mode Switch parameter changes between Active and Inactive.
    8. [ARW-LISTFAIL]

  8. If the parameter does not change

    Replace the A26 HVAC Controls.

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

  9. If the parameter changes

    10. [/ARW-LISTPASS]
  10. Press and release the defrost switch. Verify the scan tool Enhanced Defrost Switch parameter changes between Active and Inactive.
    11. [ARW-LISTFAIL]

  11. If the parameter does not change

    Replace the A26 HVAC Controls.

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

  12. If the parameter changes

    13. [/ARW-LISTPASS]
  13. Replace the M37 Mode Door Actuator and verify the M37 Mode Door Actuator can be put into all positions.
    14. [ARW-LISTFAIL]

  14. If the M37 Mode Door Actuator cannot be put into all positions

    Replace the K33 HVAC Control Module.

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

  15. If the M37 Mode Door Actuator can be put into all positions

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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


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