Chevrolet Trax: DTC B0223, B0233, B023A, OR B0408 (C67): Recirculate position command 1
circuit/airflow control circuit/actuators supply voltage
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 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
Diagnostic Fault Information
![Diagnostic Fault Information](images/manuals/4484/index439(7).jpg)
![Diagnostic Fault Information](images/manuals/4484/index440(7).jpg)
Circuit/System Description
Stepper motors are used for temperature regulation, air distribution control,
and recirculation door control.
With the switches, buttons, and dials on the HVAC controls, 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
serial data. The HVAC control module supplies a switched 12 V control voltage to
the stepper motors and
energizes the 4 stepper motor coils with a pulsed ground signal. The stepper
motors move the appropriate doors
to the requested 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, B0233 01, B023A 01, or B0408 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, B0233 06, B0233 06, or B0408 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, B0233, B023A, or 0408
- 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 (Encore), HVAC Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Manual 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
- Perform the Actuator Recalibration (C67) procedure.
- Verify the concern or DTC has been corrected.
If the concern or DTC has not been corrected
- Verify DTC B023A is not set.
- If DTC B023A is set, refer to Circuit/System Testing - DTC B023A.
- If DTC B023A is not set, refer to Circuit/System Testing - DTC B0223,
B022A, B0233, or
B0408.
If the concern or DTC has been corrected
- All OK.
Circuit/System Testing
DTC B023A
- Ignition OFF and all vehicle systems OFF, disconnect the harness
connector at the components listed
below. It may take up to 2 min for all vehicle systems to power down.
- M37 Mode Door Actuator
- M46 Air Recirculation Door Actuator
- M6 Air Temperature Door Actuator
- Disconnect the harness connector at the K33 HVAC Control Module.
- Test for infinite resistance between the K33 HVAC Control Module 12 V
reference circuit terminal 15
and ground.
If less than infinite resistance
Repair the short to ground on the circuit.
If infinite resistance
- Ignition ON.
- Test for less than 1 V between the K33 HVAC Control Module 12 V
reference circuit terminal 15 and
ground.
If 1 V or greater
Repair the short to voltage on the circuit.
If less than 1 V
- Connect the harness connector at the K33 HVAC Control Module, ignition
ON.
- Clear all DTCs.
- Verify DTC B023A is not set.
If the DTC is set.
Replace the K33 HVAC Control Module.
If the DTC is not set.
- Verify DTC B023A does not set after connecting each of the components
listed below one at a time and
operating them through their full range.
- M37 Mode Door Actuator
- M46 Air Recirculation Door Actuator
- M6 Air Temperature Door Actuator
- If the DTC sets after connecting one of the components
Replace the component that was connected immediately before the DTC set.
If the DTC does not set
- All OK.
DTC B0223, B022A, B0233, or B0408
- Ignition OFF, disconnect the harness connector at the appropriate door
actuator, ignition ON.
- Verify a test lamp flashes when connected between the 12 V reference
circuit terminal 2 and ground.
If the test lamp does not flash
- Ignition OFF, remove the test lamp and disconnect the harness connector
at the K33 HVAC
Control Module.
- Test for less than 2 ohms in the 12 V reference 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 flashes
- Connect a test lamp between each control circuit listed below and B+.
- Control Circuit - terminal 1
- Control Circuit - terminal 3
- Control Circuit - terminal 4
- Control Circuit - terminal 6
- Command the appropriate door actuator in both directions.
- Verify the test lamp turns ON and then OFF during at least one of the
directional commands
If the test lamp is always ON
- Ignition OFF, remove the test lamp and disconnect the harness connector
at the K33 HVAC
Control Module.
- 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 always OFF
- Ignition OFF, remove the test lamp and disconnect the harness connector
at the K33 HVAC
Control Module, ignition ON.
- 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
- Ignition OFF
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance is the circuit.
- If less than 2 ohms, replace the K33 HVAC Control Module.
If the test lamp turns ON and then OFF
- Replace the door actuator.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- HVAC Component Replacement Reference (C67)
- Control Module References for HVAC control module replacement,
programming and setup
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
Fig. 92: Headliner Trim Panel Retainers
With the aid of an assistant, position the headliner trim panel assembly
(2) into the vehicle through the
liftgate opening.
Connect the electrical connectors to the headliner trim panel assembly
(2).
Tape any unused connectors to the headliner with
AIR/WIND NOISE
Special Tools
CH-39570 Chassis Ear
GE-41416 Ultrasonic Leak Detector
WARNING: An assistant should drive the vehicle while the technician
checks for the
location of the reported condition. Otherwise, personal injury could
result.
To analyze a reported windnoise condition, test dri