2007 INFINITI QX56 Factory Service Manual

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Page 441 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-71
< SERVICE INFORMATION >
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INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC ( )
1. Press the mode switch to vent mode( )

TROUBLE DIAGNOSISATC-71
< SERVICE INFORMATION >
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1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC ( )
1. Press the mode switch to vent mode( ).
2. Press REC ( ) switch. The REC ( ) icon should illuminate on display.
3. Press REC ( ) switch again. The REC ( ) icon should go out on the display.
4. Listen for intake door position change (you should hear blower sound changes slightly).
Can a symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to ATC-50, "
Operational Check
(Front)" .
Can a symptom be duplicated?
YES >> Refer to ATC-32, "How to Perform Trouble Diagnosis for Quick and Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK INTAKE DOOR OPERATION
Check and verify intake door me chanism for smooth operation.
OK or NG
OK >> GO TO 5.
NG >> Repair intake door mechanism.
5.PERFORM SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to ATC-48, "
A/C System Self-Diagnosis Function" .
Are any self-diagnosis codes present?
YES >> Refer to ATC-48, "A/C System Self-Diagnosis Function" .
NO >> GO TO 6.
6.RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to ATC-50, "
Operational Check (Front)" .
Does another symptom exist?
YES >> Refer to ATC-32, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" .
NO >> Replace front air control. Refer to ATC-123, "
Removal and Installation".
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:• Front air control
• Intake door motor
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The intake door control determines the intake door posit ion based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.

Page 442 of 3061

INFINITI QX56 2007 Factory Service Manual
ATC-72
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
In the AUTO mode, the front air control determines the intake door position based on the ambient tempera-
ture, the intake air temperature and the in-

Page 443 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-73
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1. Turn ignition switch ON.
2. Check voltage between front air control harness connector M49 terminal 7 and terminal

Page 444 of 3061

INFINITI QX56 2007 Factory Service Manual
ATC-74
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Disconnect the intake door motor harness connector.
2. Check continuity between front air control harness connectorM49 terminal 7, 8 and the intake

Page 445 of 3061

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TROUBLE DIAGNOSISATC-75
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• PBR (Built into defroster door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sens

Page 446 of 3061

INFINITI QX56 2007 Factory Service Manual
ATC-76
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front

Page 447 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-77
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1. Disconnect the defroster door motor harness connector.
2. Check continuity between front air control harness conn

Page 448 of 3061

INFINITI QX56 2007 Factory Service Manual
ATC-78
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Disconnect the defroster door motor harness connector.
2. Check continuity between defroster door motor harness connec-tor M144 (B) terminal 3, 2 a

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