Air Conditioning System
HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1442/42: Air Inlet Damper Control Servo Motor Circuit
B1442/42 - Air Inlet Damper Control Servo Motor Circuit
DESCRIPTION
The recirculation damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air inlet damper to any position, which controls the intake air settings (fresh, fresh/recirculation and recirculation).
HINT
Confirm that no mechanical problem is present because this trouble code may be stored when either a damper link or damper is mechanically locked.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (RECIRCULATION DAMPER SERVO)
(a) Use the Data List to check if the recirculation damper servo sub-assembly is functioning properly Scan Tool Testing and Procedures.
Air Conditioner
OK:
The display is as specified in the normal condition column.
Result
C -- PERFORM ACTIVE TEST USING TECHSTREAM (RECIRCULATION DAMPER SERVO)
B -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
2. PERFORM ACTIVE TEST USING TECHSTREAM (RECIRCULATION DAMPER SERVO)
(a) Select the Active Test, use the Techstream to generate a control command, and then check that the recirculation damper servo sub-assembly operates Scan Tool Testing and Procedures.
Air Conditioner
OK:
Recirculation damper servo sub-assembly operates normally.
NG -- REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
3. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY
(a) Replace the recirculation damper servo sub-assembly Disassembly.
HINT
Since the recirculation damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the recirculation damper servo sub-assembly with a new or normally functioning one.
NEXT -- Continue to next step.
4. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1442 is not output.
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
OK -- END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY IS FAULTY)
5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one Removal.
NEXT -- Continue to next step.
6. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1442 is not output.
NG -- REPLACE AIR CONDITIONING HARNESS ASSEMBLY Disassembly
OK -- END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)