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DTC B0223, B022A, B0233, B023A, B0408, B0418, B0428, or B3531

DTC B0223, B022A, B0233, B023A, B0408, B0418, B0428, or B3531

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.


DTC Descriptor

DTC B0223 01

Recirculate Position Command 1 Circuit Short to Battery

DTC B0223 06

Recirculate Position Command 1 Circuit Low Voltage/Open

DTC B022A 01

Recirculate Position Command 2 Circuit Short to Battery

DTC B022A 06

Recirculate Position Command 2 Circuit Low Voltage/Open

DTC B0233 01

Air Flow Control Circuit Short to Battery

DTC B0233 06

Air Flow Control Circuit Low Voltage/Open

DTC B023A 02

HVAC Actuators Supply Voltage Short to Ground

DTC B0408 01

Main Temperature Control Circuit Short to Battery

DTC B0408 06

Main Temperature Control Circuit Low Voltage/Open

DTC B0418 01

Right Temperature Control Circuit Short to Battery

DTC B0418 06

Right Temperature Control Circuit Low Voltage/Open

DTC B0428 01

Rear Temperature Control Circuit Short to Battery

DTC B0428 06

Rear Temperature Control Circuit Low Voltage/Open

DTC B3531 01

Rear Air Flow Control Circuit Short to Battery

DTC B3531 06

Rear Air Flow Control Circuit Low Voltage/Open

Circuit/System Description

Stepper motors are used for temperature regulation, air distribution control and recirculation door control.

With the appropriate switches at the Radio/HVAC control, the desired air temperature door position, air distribution door position and recirculation door position can be put in. The selected values are passed to the HVAC control module via the LIN-Bus. The HVAC control module supplies a 12 V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors put the appropriate door into the calculated position, in order to reach the put in temperature/position.

Conditions for Running the DTC


• Ignition ON.

• The HVAC control module is ON.


Conditions for Setting the DTC

B023A 02

The stepper motors supply output is shorted to ground.

B0223 01, B022A 01, B0233 01, B0408 01, B0418 01, B0428 01 or B3531 01

At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to voltage when motor starts moving. Faults are not detected when motor is already running or target position is already reached.

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

At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to ground or open when motor starts moving. Faults are not detected when motor is already running or target position is already reached.

Action Taken When the DTC Sets


B023A 02

• The affected output will be switched off for hardware protection.

• All stepper motors are deactivated.



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

• The affected output will be switched off for hardware protection.

• The affected stepper motor is deactivated.


Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

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 Verification


1. Verify that DTC B023A 02 is not present.

2. If DTC is present, refer to Actuator Power Supply Malfunction.

3. Verify that DTC B0223, B022A, B0233, B0408 or B0418 is not set.

4. If DTC is present, refer to Actuator Malfunction.


Circuit/System Testing


Actuator Power Supply Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate actuator.

2. Ignition ON, verify that a test lamp illuminates between the 12 volt referance circuit terminal 2 and ground.

3. If the test lamp does not illuminate, test the 12 volt referance circuit for a short to ground or an open/high resistance. If the circuit tests normal test or replace the K33 HVAC control module.



Actuator Malfunction

1. Ignition OFF, disconnect the X3 and X4 harness connector at the K33 HVAC Control Module.

2. Ignition ON, test for 80-200 Ω between the 12 V reference voltage circuit terminal 15 X3 and each control circuit terminal of the appropriate actuator.

3. If less than the specified range, test for the 12 V reference voltage circuit and the control circuit for a short circuit. If the circuits test normal, replace the appropriate actuator.

4. If greater than the specified range, test the 12 V reference voltage circuit and the control circuit for an open/high resistance. If the circuits test normal, replace the appropriate actuator.

5. If all circuits test normal, replace the K33 HVAC Control Module


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• HVAC Component Replacement Reference

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