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Air Delivery Improper - Auxiliary

Air Delivery Improper - Auxiliary

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 12 V Reference

B023A 02, B0233 06, B022A 06, B0223 06, B0408 06, B0418 06, B0428 06, B3531 06

B0233 06, B022A 06, B0223 06, B0408 06, B0418 06, B0428 06, B3531 06

-

-

Rear Mode Actuator Control 1

B3531 06

B3531 06

B3531 01

1

Rear Mode Actuator Control 2

B3531 06

B3531 06

B3531 01

1

Rear Mode Actuator Control 3

B3531 06

B3531 06

B3531 01

1

Rear Mode Actuator Control 4

B3531 06

B3531 06

B3531 01

1

1. Air Delivery Improper - Auxiliary



Circuit/System Description

With the MODE switch at the Radio/HVAC control - auxiliary, the wished air distribution flap position can be put in. The selected value is sent 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 air distribution 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

Automatic 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 rear mode switch. Verify the scan tool Auxiliary Mode Switch Position parameter. The reading should correspond to the selected mode.

2. If not the specified value, replace the A21 Radio/HVAC Controls - Auxiliary.

3. If all circuits test normal, replace the M37B Mode Door Actuator - Auxiliary and verify the M37B Mode Door Actuator - Auxiliary can be put into all positions. If the M37B Mode Door Actuator - Auxiliary cannot be put into all positions, replace the K33 HVAC Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Heater and Air Conditioning and Radio Control Module Replacement

• Auxiliary Mode Valve Actuator Replacement for auxiliary mode valve actuator replacement

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