Air Recirculation Malfunction
Diagnostic Instructions
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
|
-
|
-
|
Recirculation Actuator Control 1
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
Recirculation Actuator Control 2
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
Recirculation Actuator Control 3
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
Recirculation Actuator Control 4
|
B0223 06
|
B0223 06
|
B0223 01
|
1
|
1. Air Recirculation Malfunction
|
|
| |
Circuit/System Description
The desired position of the recirculation flap can be set with
the recirculation switch at the HVAC control. The selected value is
sent to the HVAC control module via the LIN-Bus. The HVAC control
module supplies a 12 V reference voltage to the stepper motor and
energizes the 4 stepper motor coils with a pulsed ground signal.
The stepper motor moves the recirculation flap into the selected
position.
Diagnostic Aids
Check the following mechanical fault sources:
| • |
Air distribution hoses/air
distribution ducts |
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 Testing
| 1. |
Ignition ON, press and release
the defrost switch. Verify the scan tool Enhanced Defrost Switch
parameter changes between Active and Inactive. |
⇒ If the parameter
does not change
Replace the A26 HVAC Controls.
⇓ If the parameter
changes
| 2. |
Press and release the
recirculation switch. Verify the scan tool Air Recirculation Mode
Switch parameter changes between Active and Inactive. |
⇒ If the parameter
does not change
Replace the A26 HVAC Controls.
⇓ If the parameter
changes
| 3. |
Replace the M46 Air
Recirculation Door Actuator and verify the M46 Air Recirculation
Door Actuator can be put into all positions. |
⇒ If the M46 Air
Recirculation Door Actuator cannot be put into all
positions
Replace the K33 HVAC Control Module.
⇓ If the M46 Air
Recirculation Door Actuator can be put into all
positions
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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