Workshop Manuals Factory service & repair Vauxhall
Vauxhall Astra J12 · HVAC
12 · Heating & A/C

Air Delivery Improper

Make
Vauxhall
Model
Astra J
Section
HVAC Systems - Automatic › Other Information › Air Delivery Improper
HVACAir Delivery Improper

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, B022A 06, B0233 06, B0408 06, B0418 06
B0223 06, B022A 06, B0233 06, B0408 06, B0418 06
-
-

Mode Actuator Control 1
B0233 06
B0233 06
B0233 01
1

Mode Actuator Control 2
B0233 06
B0233 06
B0233 01
1

Mode Actuator Control 3
B0233 06
B0233 06
B0233 01
1

Mode 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 wished air distribution flap position can be put in. The selected value is sent to the HVAC control module via 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 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

Automatic HVAC Description and Operation


Electrical Information Reference


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.
    ⇒  If the parameter does not change

Replace the A26 HVAC Controls.     ⇓  If the parameter changes

2. Press and release the switch for air distribution to face. Verify the scan tool Instrument Panel Vents Switch parameter changes between Active and Inactive.
    ⇒  If the parameter does not change

Replace the A26 HVAC Controls.     ⇓  If the parameter changes

3. Press and release the switch for air distribution to floor. Verify the scan tool Floor Mode Switch parameter changes between Active and Inactive.
    ⇒  If the parameter does not change

Replace the A26 HVAC Controls.     ⇓  If the parameter changes

4. Press and release the defrost switch. Verify the scan tool Enhanced Defrost Switch parameter changes between Active and Inactive.
    ⇒  If the parameter does not change

Replace the A26 HVAC Controls.     ⇓  If the parameter changes

5. Replace the M37 Mode Door Actuator and verify the M37 Mode Door Actuator can be put into all positions.
    ⇒  If the M37 Mode Door Actuator cannot be put into all positions

Replace the K33 HVAC Control Module.     ⇓  If the M37 Mode Door Actuator can be put into all positions

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•  Control Module References for HVAC control module replacement, programming and setup

Parts & tools for this job For Vauxhall Astra

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