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B022A





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

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions 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

Diagnostic Fault Information






Circuit/System Description

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

With the switches on the Radio/HVAC control, air temperature door position, mode door position and recirculation door position can be selected. The selected values are passed to the HVAC control module via the serial data. 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 move the appropriate doors into the calculated positions, in order to reach the desired positions.

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, B023A 01, B0408 01 or B0418 01

At least one control circuits 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, B0233 06, B0408 06 or B0418 06

At least one control circuits 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, B023A, B0408 or B0418,

* 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 HVAC - Automatic

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Automatic HVAC Description and Operation HVAC - Automatic

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

Note: This diagnosis requires the use of a GM approved test lamp (J-35616-210) or equivalent. Failure to do so may result in misdiagnosis of the module.

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

2. Connect a test lamp between the control circuit terminal 2 and ground.

3. Verify the test lamp is blinking after commanding the appropriate door actuator in both directions with a scan tool.

• If the test lamp is always OFF

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

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K33 HVAC Control Module.

• If the test lamp is always ON

1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K33 HVAC Control Module.

• If the test lamp is blinking

4. Connect a test lamp between each actuator control circuit terminal listed below and B+, one at a time.

* Control circuit - terminal 1

* Control circuit - terminal 3

* Control circuit - terminal 4

* Control circuit - terminal 6

5. Verify the test lamp is blinking after commanding the appropriate door actuator in both directions with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. Ignition OFF

4. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K33 HVAC Control Module.

• If the test lamp is always ON

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

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K33 HVAC Control Module.

• If the test lamp is blinking

6. Replace the door actuator.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* HVAC Component Replacement Reference HVAC Component Replacement Reference

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

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