DTC B0223, B0233, B023A, or B0418
Diagnostic Instructions
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 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 B0418 01: Main Temperature Control Circuit
Short to Battery |
DTC B0418 06: Main Temperature Control Circuit
Low Voltage/Open |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Stepper Motors 12V Reference
|
B023A 02, B0223 06, B0233 06, B0418 06
|
B0223 06, B0233 06, B0418 06
|
-
|
-
|
Air Recirculation Actuator Control 1
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
Air Recirculation Actuator Control 2
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
Air Recirculation Actuator Control 3
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
Air Recirculation Actuator Control 4
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
Air Temperature Actuator Control 1
|
B0418 06
|
B0418 06
|
B0418 01
|
2
|
Air Temperature Actuator Control 2
|
B0418 06
|
B0418 06
|
B0418 01
|
2
|
Air Temperature Actuator Control 3
|
B0418 06
|
B0418 06
|
B0418 01
|
2
|
Air Temperature Actuator Control 4
|
B0418 06
|
B0418 06
|
B0418 01
|
2
|
Mode Actuator Control 1
|
B0233 06
|
B0233 06
|
B0233 01
|
3
|
Mode Actuator Control 2
|
B0233 06
|
B0233 06
|
B0233 01
|
3
|
Mode Actuator Control 3
|
B0233 06
|
B0233 06
|
B0233 01
|
3
|
Mode Actuator Control 4
|
B0233 06
|
B0233 06
|
B0233 01
|
3
|
1. Air Recirculation Malfunction
2. Air Temperature Malfunction
3. Air Distribution Malfunction
|
|
|
Circuit/System Description
Stepper motors are used for temperature regulation, air
distribution control and air recirculation flap control.
With the appropriate switches at the HVAC control, the desired
air temperature flap position, air distribution flap position and
air 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
• |
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 or B0418 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, B0233 06 or B0418 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. |
• |
All stepper motors are
deactivated. |
B0223, B0233 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
Connector End View Reference
Component Connector End Views
Description and Operation
Manual HVAC Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. |
Verify that DTC B023A 02 is
not set. |
⇒ If DTC B023A is
set
Refer to Actuator Power Supply
Malfunction. ⇓ If
DTC B023A is not set
2. |
Verify that DTC B0223 01 or
B0223 06 is not set. |
⇒ If DTC B0223 is
set
Refer to Air Recirculation Actuator
Malfunction. ⇓ If
DTC B0223 is not set
3. |
Verify that DTC B0233 01 or
B0233 06 is not set. |
⇒ If DTC B0233 is
set
Refer to Mode Actuator Malfunction.
⇓ If DTC B0233 is
not set
4. |
Verify that DTC B0418 01 or
B0418 06 is not set. |
⇒ If DTC B0418 is
set
Refer to Air Temperature Actuator
Malfunction. ⇓ If
DTC B0418 is not set
Circuit/System Testing
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. |
Air 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, ignition ON. |
2. |
Test for less than 0.3 V
between the control circuit terminal at the K33 HVAC Control Module
harness connector listed below and ground: |
⇒ If greater than
0.3 V
Repair the short to voltage on the
circuit. ⇓ If less
than 0.3 V
4. |
Test for infinite resistance
between the control circuit terminal at the K33 HVAC Control Module
harness connector listed below and ground: |
⇒ If less than
infinite resistance
Repair the short to ground on the
circuit. ⇓ If
infinite resistance
5. |
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 5 Ω or
greater
Repair the open/high resistance in
the circuit. ⇓ If
less than 5 Ω
6. |
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
Mode Actuator Malfunction
1. |
Ignition OFF, disconnect the
X3 harness connector at the K33 HVAC Control Module and at the M37
Mode Door Actuator, ignition ON. |
2. |
Test for less than 0.3 V
between the control circuit terminal listed below and
ground: |
⇒ If greater than
0.3 V
Repair the short to voltage on the
circuit. ⇓ If less
than 0.3 V
4. |
Test for infinite resistance
between the control circuit terminal listed below and
ground: |
⇒ If less than
infinite resistance
Repair the short to ground on the
circuit. ⇓ If
infinite resistance
5. |
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 5 Ω or
greater
Repair the open/high resistance in
the circuit. ⇓ If
less than 5 Ω
6. |
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
Air Temperature Actuator Malfunction
1. |
Ignition OFF, disconnect the
X3 harness connector at the K33 HVAC Control Module and at the M6
Air Temperature Door Actuator, ignition ON. |
2. |
Test for less than 0.3 V
between the control circuit terminal listed below and
ground: |
⇒ If greater than
0.3 V
Repair the short to voltage on the
circuit. ⇓ If less
than 0.3 V
4. |
Test for infinite resistance
between the control circuit terminal listed below and
ground: |
⇒ If less than
infinite resistance
Repair the short to ground on the
circuit. ⇓ If
infinite resistance
5. |
Test for less than 5 Ω
between the control circuit terminals listed below: |
|
• |
M6 Air Temperature Door
Actuator terminal 1 and terminal 11 X3 at the K33 HVAC Control
Module harness connector |
|
• |
M6 Air Temperature Door
Actuator terminal 2 and terminal 15 X3 at the K33 HVAC Control
Module harness connector |
|
• |
M6 Air Temperature Door
Actuator terminal 3 and terminal 12 X3 at the K33 HVAC Control
Module harness connector |
|
• |
M6 Air Temperature Door
Actuator terminal 4 and terminal 13 X3 at the K33 HVAC Control
Module harness connector |
|
• |
M6 Air Temperature Door
Actuator terminal 6 and terminal 14 X3 at the K33 HVAC Control
Module harness connector |
⇒ If 5 Ω or
greater
Repair the open/high resistance in
the circuit. ⇓ If
less than 5 Ω
6. |
Replace the M6 Air Temperature
Door Actuator and verify the DTC does not reset. |
⇒ If DTC
resets
Replace the K33 HVAC Control Module.
⇓ If DTC does not
reset
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|