Orlando

DTC B0223, B0233, B023A, or B0408

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

With the appropriate switches at the HVAC controls, the desired air temperature flap position, air distribution flap position and recirculation flap 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 energises the 4 stepper motor coils with a pulsed ground signal. The stepper motors put the appropriate flap into the calculated position, in order to reach the put in temperature/position.

B023A 02

The stepper motors supply output is shorted to ground.

B0223 01, B0233 01 or B0408 01

At least one control output (of 4 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, B0233 06 or B0408 06

At least one control output (of 4 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.

B023A 02

B0223, B0233 or B0408

The condition for setting the DTC is no longer present.

Schematic Reference

HVAC Schematics : Automatic

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

1. Verify that DTC B023A 02 is not present.

⇒	If DTC B023A is present

Refer to Actuator Power Supply Malfunction.

⇓	If DTC B023A is not present

2. Verify that DTC B0223 01 or B0223 06 is not present.

⇒	If DTC B0223 is present

Refer to Recirculation Actuator Malfunction.

⇓	If DTC B0223 is not present

3. Verify that DTC B0233 01 or B0233 06 is not present.

⇒	If DTC B0233 is present

Refer to Mode Actuator Malfunction.

⇓	If DTC B0233 is not present

4. Verify that DTC B0408 01 or B0408 06 is not present.

⇒	If DTC B0408 is present

Refer to Air Temperature Actuator Malfunction.

⇓	If DTC B0408 is not present

5. All OK.

Actuator Power Supply Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module.
2. Test for infinite resistance between the reference voltage circuit terminal 15 X3 and ground.

⇒	If less than infinite resistance

Repair the short to ground on the circuit.

⇓	If infinite resistance

3. Replace the K33 HVAC Control Module.

Recirculation Actuator Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M46 Air Recirculation Door Actuator.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal at the K33 HVAC Control Module harness connector listed below and ground:

•	Terminal 16 X3

•	Terminal 17 X3

•	Terminal 18 X3

•	Terminal 19 X3

⇒	If greater than 0.3 V

Repair the short to voltage on the circuit.

⇓	If less than 0.3 V

3. Ignition OFF, test for infinite resistance between the control circuit terminal at the K33 HVAC Control Module harness connector listed below and ground:

•	Terminal 16 X3

•	Terminal 17 X3

•	Terminal 18 X3

•	Terminal 19 X3

⇒	If less than infinite resistance

Repair the short to ground on the circuit.

⇓	If infinite resistance

4. Test for less than 5 Ω between the control circuit terminals listed below:

•	M46 Air Recirculation Door Actuator terminal 1 and terminal 16 X3 at the K33 HVAC Control Module harness connector

•	M46 Air Recirculation Door Actuator terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector

•	M46 Air Recirculation Door Actuator terminal 3 and terminal 17 X3 at the K33 HVAC Control Module harness connector

•	M46 Air Recirculation Door Actuator terminal 4 and terminal 18 X3 at the K33 HVAC Control Module harness connector

•	M46 Air Recirculation Door Actuator terminal 6 and terminal 19 X3 at the K33 HVAC Control Module harness connector

⇒	If greater than 5 Ω

Repair the open/high resistance in the circuit.

⇓	If less than 5 Ω

5. Replace the M46 Air Recirculation Door Actuator and verify the DTC does not reset.

⇒	If DTC resets

Replace the K33 HVAC Control Module.

⇓	If DTC does not reset

6. All OK.

Mode Actuator Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M37 Mode Door Actuator.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:

•	Terminal 2 X3

•	Terminal 3 X3

•	Terminal 4 X3

•	Terminal 5 X3

⇒	If greater than 0.3 V

Repair the short to voltage on the circuit.

⇓	If less than 0.3 V

3. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:

•	Terminal 2 X3

•	Terminal 3 X3

•	Terminal 4 X3

•	Terminal 5 X3

⇒	If less than infinite resistance

Repair the short to ground on the circuit.

⇓	If infinite resistance

4. Test for less than 5 Ω between the control circuit terminals listed below:

•	M37 Mode Door Actuator terminal 1 and terminal 2 X3 at the K33 HVAC Control Module harness connector

•	M37 Mode Door Actuator terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector

•	M37 Mode Door Actuator terminal 3 and terminal 3 X3 at the K33 HVAC Control Module harness connector

•	M37 Mode Door Actuator terminal 4 and terminal 4 X3 at the K33 HVAC Control Module harness connector

•	M37 Mode Door Actuator terminal 6 and terminal 5 X3 at the K33 HVAC Control Module harness connector

⇒	If greater than 5 Ω

Repair the open/high resistance in the circuit.

⇓	If less than 5 Ω

5. Replace the M37 Mode Door Actuator and verify the DTC does not reset.

⇒	If DTC resets

Replace the K33 HVAC Control Module.

⇓	If DTC does not reset

6. All OK.

Air Temperature Actuator Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M6L Air Temperature Door Actuator - Left.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:

•	Terminal 11 X3

•	Terminal 12 X3

•	Terminal 13 X3

•	Terminal 14 X3

⇒	If greater than 0.3 V

Repair the short to voltage on the circuit.

⇓	If less than 0.3 V

3. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:

•	Terminal 11 X3

•	Terminal 12 X3

•	Terminal 13 X3

•	Terminal 14 X3

⇒	If less than infinite resistance

Repair the short to ground on the circuit.

⇓	If infinite resistance

4. Test for less than 5 Ω between the control circuit terminals listed below:

•	M6L Air Temperature Door Actuator - Left terminal 1 and terminal 11 X3 at the K33 HVAC Control Module harness connector

•	M6L Air Temperature Door Actuator - Left terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector

•	M6L Air Temperature Door Actuator - Left terminal 3 and terminal 12 X3 at the K33 HVAC Control Module harness connector

•	M6L Air Temperature Door Actuator - Left terminal 4 and terminal 13 X3 at the K33 HVAC Control Module harness connector

•	M6L Air Temperature Door Actuator - Left terminal 6 and terminal 14 X3 at the K33 HVAC Control Module harness connector

⇒	If greater than 5 Ω

Repair the open/high resistance in the circuit.

⇓	If less than 5 Ω

5. Replace the M6L Air Temperature Door Actuator - Left and verify the DTC does not reset.

⇒	If DTC resets

Replace the K33 HVAC Control Module.

⇓	If DTC does not reset

6. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.