Chevrolet Trax: DTC B0223, B022A, B0233, B023A, B0408, OR B0418:
Recirculate position command/air flow control/temperature control circuit
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
Diagnostic Fault Information
![Diagnostic Fault Information](images/manuals/4484/index418(10).jpg)
![Diagnostic Fault Information](images/manuals/4484/index419(9).jpg)
Circuit/System Description
Stepper motors are used for temperature regulation, air distribution control
and recirculation door control.
With the switches 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 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 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
- The affected output will be switched off for hardware protection.
- All stepper motors are deactivated.
B0223, B022A, B0233, 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 (Encore)
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
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
- Perform the Actuator Recalibration procedure.
- Verify the concern or DTC has been corrected.
If the concern or DTC has not been corrected
- Verify DTC B023A is not set.
Refer to Circuit/System Testing - DTC B023A.
Refer to Circuit/System Testing - DTC B0223, B022A, B0233, B0408 or B0418.
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
- M6L Air Temperature Door Actuator - Left
- M6R Air Temperature Door Actuator - Right
- Disconnect the X3 and X4 harness connectors at the K33 HVAC Control
Module.
- Test for infinite resistance between the K33 HVAC Control Module 12 V
reference circuit terminal 15
X3 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 X3 and
ground.
If 1 V or greater
Repair the short to voltage on the circuit.
If less than 1 V
- Connect the X3 and X4 harness connectors 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
- M6L Air Temperature Door Actuator - Left
- M6R Air Temperature Door Actuator - Right
If the DTC sets
Replace the component that was connected immediately before the DTC set.
If the DTC does not set
- All OK.
DTC B0223, B022A, B0233, B0408 or B0418
- 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 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 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
- 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
NOTE: The following steps must be completed before using the
symptom tables:
Perform the Diagnostic System Check - Vehicle before using the HVAC
System Malfunction procedure
in order to verify t
SEE MORE:
Fig. 437: Starter, Bolt, Stud And Washer
Install the starter (4).
Install the lower starter bolt stud (3) and if equipped the washer.
Install the upper starter bolt (2) and if equipped the washer (1).
CAUTION: Refer to Fastener Caution .
Tighten the starter bolt and starter bolt stud
Rear-Facing Infant Seat
A rear-facing infant seat provides
restraint with the seating surface
against the back of the infant.
The harness system holds the infant
in place and, in a crash, acts to
keep the infant positioned in the
restraint.
Forward-Facing Child Seat
A forward-facing child seat