PRE-RELEASE
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.
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| • |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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| • |
Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
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
Air Flow Control Rear Circuit Short to Battery
DTC B3531 06
Air Flow Control Rear Circuit Low Voltage/Open
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Stepper Motors 12V Reference
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B023A 02, B0223 06, B022A 06, B0233 06, B0408 06, B0418 06, B0428 06, B3531 06
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B0223 06, B022A 06, B0233 06, B0408 06, B0418 06, B0428 06, B3531 06
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-
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Recirculation Actuator Control 1
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B0223 06
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B0223 06
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B0223 01
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1
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Recirculation Actuator Control 2
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B0223 06
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B0223 06
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B0223 01
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1
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Recirculation Actuator Control 3
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B0223 06
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B0223 06
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B0223 01
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1
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Recirculation Actuator Control 4
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B0223 06
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B0223 06
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B0223 01
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1
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Air Temperature Actuator - Left Control 1
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B0408 06
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B0408 06
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B0408 01
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2
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Air Temperature Actuator - Left Control 2
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B0408 06
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B0408 06
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B0408 01
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2
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Air Temperature Actuator - Left Control 3
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B0408 06
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B0408 06
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B0408 01
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2
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Air Temperature Actuator - Left Control 4
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B0408 06
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B0408 06
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B0408 01
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2
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Air Temperature Actuator - Right Control 1
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B0418 06
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B0418 06
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B0418 01
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2
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Air Temperature Actuator - Right Control 2
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B0418 06
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B0418 06
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B0418 01
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2
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Air Temperature Actuator - Right Control 3
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B0418 06
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B0418 06
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B0418 01
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2
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Air Temperature Actuator - Right Control 4
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B0418 06
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B0418 06
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B0418 01
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2
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Mode Actuator Control 1
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B0233 06
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B0233 06
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B0233 01
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3
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Mode Actuator Control 2
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B0233 06
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B0233 06
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B0233 01
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3
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Mode Actuator Control 3
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B0233 06
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B0233 06
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B0233 01
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3
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Mode Actuator Control 4
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B0233 06
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B0233 06
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B0233 01
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3
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Air Inlet Actuator Control 1
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B022A 06
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B022A 06
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B022A 01
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1
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Air Inlet Actuator Control 2
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B022A 06
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B022A 06
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B022A 01
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1
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Air Inlet Actuator Control 3
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B022A 06
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B022A 06
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B022A 01
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1
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Air Inlet Actuator Control 4
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B022A 06
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B022A 06
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B022A 01
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1
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Rear Air Temperature Actuator Control 1
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B0428 06
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B0428 06
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B0428 01
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4
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Rear Air Temperature Actuator Control 2
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B0428 06
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B0428 06
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B0428 01
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4
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Rear Air Temperature Actuator Control 3
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B0428 06
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B0428 06
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B0428 01
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4
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Rear Air Temperature Actuator Control 4
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B0428 06
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B0428 06
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B0428 01
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4
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Rear Mode Actuator Control 1
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B3531 06
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B3531 06
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B3531 01
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5
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Rear Mode Actuator Control 2
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B3531 06
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B3531 06
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B3531 01
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5
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Rear Mode Actuator Control 3
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B3531 06
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B3531 06
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B3531 01
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5
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Rear Mode Actuator Control 4
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B3531 06
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B3531 06
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B3531 01
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5
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1. Air Recirculation Malfunction
2. Air Temperature Malfunction 3. Air Distribution Malfunction 4. Auxiliary Air Temperature Malfunction 5. Air Delivery Improper - Auxiliary |
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| Circuit/System Description |
Stepper motors are used for temperature regulation, air distribution control and recirculation flap control.
With the appropriate switches at the Radio/HVAC control, 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 energizes 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.
| Conditions for Running the DTC |
| • |
Ignition ON.
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The HVAC control module is ON.
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| 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.
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All stepper motors are deactivated.
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B0223, B022A, B0233, B0408, B0418, B0428 or B3531
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The affected output will be switched off for hardware protection.
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| • |
The affected stepper motor is deactivated.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Verify that DTC B023A 02 is not present.
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| 2. |
If DTC is present, refer to Actuator Power Supply Malfunction.
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| 3. |
Verify that DTC B0223 01 or B0223 06 is not present.
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| 4. |
If DTC is present, refer to Recirculation Actuator Malfunction.
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| 5. |
Verify that DTC B022A 01 or B022A 06 is not present.
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| 6. |
If DTC is present, refer to Air Inlet Actuator Malfunction.
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| 7. |
Verify that DTC B0233 01 or B0233 06 is not present.
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| 8. |
If DTC is present, refer to Mode Actuator Malfunction.
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| 9. |
Verify that DTC B0408 01 or B0408 06 is not present.
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| 10. |
If DTC is present, refer to Air Temperature Actuator - Left Malfunction.
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| 11. |
Verify that DTC B0418 01 or B0418 06 is not present.
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| 12. |
If DTC is present, refer to Air Temperature Actuator - Right Malfunction.
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| 13. |
Verify that DTC B0428 01 or B0428 06 is not present.
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| 14. |
If DTC is present, refer to Rear Air Temperature Actuator Malfunction.
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| 15. |
Verify that DTC B3531 01 or B3531 06 is not present.
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| 16. |
If DTC is present, refer to Rear Mode Actuator Malfunction.
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| Circuit/System Testing |
Actuator Power Supply Malfunction
| 1. |
Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module.
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| 2. |
Test for infinite resistance between the reference voltage circuit terminal 15 X3 and ground
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| 3. |
If less than the specified value, test the reference voltage circuit for a short to ground.
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| 4. |
Test for infinite resistance between the reference voltage circuit terminal 10 X4 and ground
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| 5. |
If less than the specified value, test the reference voltage circuit for a short to ground.
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| 6. |
If all circuits test normal, test or replace the K33 HVAC Control Module.
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Recirculation Actuator Malfunction
| 1. |
Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M46 Air Recirculation Door Motor.
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| 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:
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Terminal 16 X3
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Terminal 17 X3
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Terminal 18 X3
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Terminal 19 X3
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| 3. |
If greater than the specified value, test the control circuit for a short to voltage.
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| 4. |
Ignition OFF, test for infinite resistance between the control circuit terminal at the K33 HVAC Control Module harness connector listed below and ground:
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Terminal 16 X3
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Terminal 17 X3
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Terminal 18 X3
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Terminal 19 X3
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| 5. |
If less than the specified value, test the control circuit for a short to ground.
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| 6. |
Test for less than 5 Ω between the control circuit terminals listed below:
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M46 Air Recirculation Door Motor terminal 1 and terminal 16 X3 at the K33 HVAC Control Module harness connector
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M46 Air Recirculation Door Motor terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector
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M46 Air Recirculation Door Motor terminal 3 and terminal 17 X3 at the K33 HVAC Control Module harness connector
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M46 Air Recirculation Door Motor terminal 4 and terminal 18 X3 at the K33 HVAC Control Module harness connector
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M46 Air Recirculation Door Motor terminal 6 and terminal 19 X3 at the K33 HVAC Control Module harness connector
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| 7. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 8. |
If all circuits test normal, replace the M46 Air Recirculation Door Motor and verify the DTC does not reset.
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| 9. |
If the DTC resets, replace the K33 HVAC Control Module.
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Air Inlet Actuator Malfunction
| 1. |
Ignition OFF, disconnect the X3 and the X4 harness connector at the K33 HVAC Control Module and at the M4 Air Inlet Actuator.
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| 2. |
Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:
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Terminal 1 X4
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Terminal 2 X4
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Terminal 3 X4
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Terminal 4 X4
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| 3. |
If greater than the specified value, test the control circuit for a short to voltage.
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| 4. |
Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:
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Terminal 1 X4
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Terminal 2 X4
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Terminal 3 X4
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Terminal 4 X4
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| 5. |
If less than the specified value, test the control circuit for a short to ground.
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| 6. |
Test for less than 5 Ω between the control circuit terminals listed below:
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M4 Air Inlet Actuator terminal 1 and terminal 1 X4 at the K33 HVAC Control Module harness connector
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M4 Air Inlet Actuator terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector
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M4 Air Inlet Actuator terminal 3 and terminal 2 X4 at the K33 HVAC Control Module harness connector
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M4 Air Inlet Actuator terminal 4 and terminal 3 X4 at the K33 HVAC Control Module harness connector
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M4 Air Inlet Actuator terminal 6 and terminal 4 X4 at the K33 HVAC Control Module harness connector
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| 7. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 8. |
If all circuits test normal, replace the M4 Air Inlet Actuator and verify the DTC does not reset.
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| 9. |
If the DTC resets, replace the K33 HVAC Control Module.
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Mode Actuator Malfunction
| 1. |
Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M37 Mode Door Actuator.
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| 2. |
Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:
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Terminal 2 X3
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Terminal 3 X3
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Terminal 4 X3
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Terminal 5 X3
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| 3. |
If greater than the specified value, test the control circuit for a short to voltage.
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| 4. |
Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:
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Terminal 2 X3
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Terminal 3 X3
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Terminal 4 X3
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Terminal 5 X3
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| 5. |
If less than the specified value, test the control circuit for a short to ground.
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| 6. |
Test for less than 5 Ω between the control circuit terminals listed below:
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M37 Mode Door Actuator terminal 1 and terminal 2 X3 at the K33 HVAC Control Module harness connector
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M37 Mode Door Actuator terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector
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M37 Mode Door Actuator terminal 3 and terminal 3 X3 at the K33 HVAC Control Module harness connector
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M37 Mode Door Actuator terminal 4 and terminal 4 X3 at the K33 HVAC Control Module harness connector
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M37 Mode Door Actuator terminal 6 and terminal 5 X3 at the K33 HVAC Control Module harness connector
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| 7. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 8. |
If all circuits test normal, replace the M37 Mode Door Actuator and verify the DTC does not reset.
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| 9. |
If the DTC resets, replace the K33 HVAC Control Module.
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Air Temperature Actuator - Left Malfunction
| 1. |
Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M6L Air Temperature Door Actuator - Left.
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| 2. |
Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:
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Terminal 11 X3
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Terminal 12 X3
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Terminal 13 X3
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Terminal 14 X3
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| 3. |
If greater than the specified value, test the control circuit for a short to voltage.
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| 4. |
Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:
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Terminal 11 X3
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Terminal 12 X3
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Terminal 13 X3
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Terminal 14 X3
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| 5. |
If less than the specified value, test the control circuit for a short to ground.
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| 6. |
Test for less than 5 Ω between the control circuit terminals listed below:
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M6L Air Temperature Door Actuator - Left terminal 1 and terminal 11 X3 at the K33 HVAC Control Module harness connector
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M6L Air Temperature Door Actuator - Left terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector
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M6L Air Temperature Door Actuator - Left terminal 3 and terminal 12 X3 at the K33 HVAC Control Module harness connector
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M6L Air Temperature Door Actuator - Left terminal 4 and terminal 13 X3 at the K33 HVAC Control Module harness connector
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M6L Air Temperature Door Actuator - Left terminal 6 and terminal 14 X3 at the K33 HVAC Control Module harness connector
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| 7. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 8. |
If all circuits test normal, replace the M6L Air Temperature Door Actuator - Left and verify the DTC does not reset.
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| 9. |
If the DTC resets, replace the K33 HVAC Control Module.
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Air Temperature Actuator - Right Malfunction
| 1. |
Ignition OFF, disconnect the X3 and the X4 harness connector at the K33 HVAC Control Module and at the M6R Air Temperature Door Actuator - Right.
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| 2. |
Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:
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Terminal 5 X4
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Terminal 6 X4
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Terminal 7 X4
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Terminal 8 X4
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| 3. |
If greater than the specified value, test the control circuit for a short to voltage.
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| 4. |
Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:
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Terminal 5 X4
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Terminal 6 X4
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Terminal 7 X4
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Terminal 8 X4
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| 5. |
If less than the specified value, test the control circuit for a short to ground.
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| 6. |
Test for less than 5 Ω between the control circuit terminals listed below:
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M6R Air Temperature Door Actuator - Right terminal 1 and terminal 5 X4 at the K33 HVAC Control Module harness connector
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M6R Air Temperature Door Actuator - Right terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector
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M6R Air Temperature Door Actuator - Right terminal 3 and terminal 6 X4 at the K33 HVAC Control Module harness connector
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M6R Air Temperature Door Actuator - Right terminal 4 and terminal 7 X4 at the K33 HVAC Control Module harness connector
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M6R Air Temperature Door Actuator - Right terminal 6 and terminal 8 X4 at the K33 HVAC Control Module harness connector
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| 7. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 8. |
If all circuits test normal, replace the M6R Air Temperature Door Actuator - Right and verify the DTC does not reset.
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| 9. |
If the DTC resets, replace the K33 HVAC Control Module.
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Rear Air Temperature Actuator Malfunction
| 1. |
Ignition OFF, disconnect the X4 harness connector at the K33 HVAC Control Module and at the M37B Mode Door Actuator - Auxiliary.
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| 2. |
Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:
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Terminal 17 X4
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Terminal 18 X4
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Terminal 19 X4
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Terminal 20 X4
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| 3. |
If greater than the specified value, test the control circuit for a short to voltage.
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| 4. |
Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:
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Terminal 17 X4
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Terminal 18 X4
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Terminal 19 X4
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Terminal 20 X4
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| 5. |
If less than the specified value, test the control circuit for a short to ground.
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| 6. |
Test for less than 5 Ω between the control circuit terminals listed below:
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M37B Mode Door Actuator - Auxiliary terminal 1 and terminal 17 X4 at the K33 HVAC Control Module harness connector
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M37B Mode Door Actuator - Auxiliary terminal 2 and terminal 10 X4 at the K33 HVAC Control Module harness connector
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M37B Mode Door Actuator - Auxiliary terminal 3 and terminal 18 X4 at the K33 HVAC Control Module harness connector
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M37B Mode Door Actuator - Auxiliary terminal 4 and terminal 19 X4 at the K33 HVAC Control Module harness connector
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M37B Mode Door Actuator - Auxiliary terminal 6 and terminal 20 X4 at the K33 HVAC Control Module harness connector
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| 7. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 8. |
If all circuits test normal, replace the M37B Mode Door Actuator - Auxiliary and verify the DTC does not reset.
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| 9. |
If the DTC resets, replace the K33 HVAC Control Module.
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Rear Mode Actuator Malfunction
| 1. |
Ignition OFF, disconnect the X4 harness connector at the K33 HVAC Control Module and at the M6B Air Temperature Door Actuator - Auxiliary.
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| 2. |
Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground:
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Terminal 13 X4
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Terminal 14 X4
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Terminal 15 X4
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Terminal 16 X4
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| 3. |
If greater than the specified value, test the control circuit for a short to voltage.
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| 4. |
Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground:
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Terminal 13 X4
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Terminal 14 X4
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Terminal 15 X4
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Terminal 16 X4
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| 5. |
If less than the specified value, test the control circuit for a short to ground.
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| 6. |
Test for less than 5 Ω between the control circuit terminals listed below:
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| • |
M6B Air Temperature Door Actuator - Auxiliary terminal 1 and terminal 13 X4 at the K33 HVAC Control Module harness connector
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M6B Air Temperature Door Actuator - Auxiliary terminal 2 and terminal 10 X4 at the K33 HVAC Control Module harness connector
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M6B Air Temperature Door Actuator - Auxiliary terminal 3 and terminal 14 X4 at the K33 HVAC Control Module harness connector
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M6B Air Temperature Door Actuator - Auxiliary terminal 4 and terminal 15 X4 at the K33 HVAC Control Module harness connector
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M6B Air Temperature Door Actuator - Auxiliary terminal 6 and terminal 16 X4 at the K33 HVAC Control Module harness connector
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| 7. |
If greater than the specified value, test the control circuit for an open/high resistance.
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| 8. |
If all circuits test normal, replace the M6B Air Temperature Door Actuator - Auxiliary and verify the DTC does not reset.
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| 9. |
If the DTC resets, replace the K33 HVAC Control Module.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • |
Temperature Valve Actuator Replacement - Left Side (Right Hand Drive)
Temperature Valve Actuator Replacement - Left Side (Left Hand Drive)
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Temperature Valve Actuator Replacement - Right Side (Left Hand Drive)
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Mode Control Cam Actuator Replacement (Right Hand Drive)
Mode Control Cam Actuator Replacement (Left Hand Drive)
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Air Inlet Valve Actuator Replacement (Right Hand Drive)
Air Inlet Valve Actuator Replacement (Left Hand Drive)
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Inside Air Valve Actuator Replacement (Right Hand Drive)
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Auxiliary Temperature Valve Actuator Replacement
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Auxiliary Mode Valve Actuator Replacement
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Control Module References
for HVAC control module replacement, setup, and programming
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