2007 INFINITI QX56 rear door

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Page 417 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-47
< SERVICE INFORMATION >
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Front Air Control Termina l and Reference ValueINFOID:0000000003533247
Measure voltage between each terminal and grou

Page 418 of 3061

INFINITI QX56 2007 Factory Service Manual
ATC-48
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
A/C System Self-Diagnosis Function
INFOID:0000000003533248
DESCRIPTION
22 Y/R Power supply for BAT - - Battery voltage
23 R/L Illumination + ON Park l

Page 419 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-49
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The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. Refer to applicable sections
(items) fo

Page 421 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-51
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1. Rotate temperature control dial (driver si de or passenger side) counterclockwise until 16 °C (60 °F) is dis-
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TROUBLE DIAGNOSISATC-51
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1. Rotate temperature control dial (driver si de or passenger side) counterclockwise until 16 °C (60 °F) is dis-
played.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operat ion. If OK, go to trouble diagnosis procedure for ATC-100,
"Insufficient Cooling" . If air mix door motor appears to be malfunctioning, go to ATC-59, "Air Mix Door Motor
Circuit" or ATC-59, "Air Mix Door Motor Circuit".
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Rotate temperature control dial clockw ise (driver side or passenger side) until 32°C (90 °F) is displayed.
2. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operat ion. If OK, go to trouble diagnosis procedure for ATC-108,
"Insufficient Heating" . If air mix door motor appears to be malfunctioning, go to ATC-59, "Air Mix Door Motor
Circuit" or ATC-59, "Air Mix Door Motor Circuit".
If OK, continue with next check.
CHECK A/C SWITCH
1. Press A/C switch when AUTO switch is ON, or in manual mode.
2. A/C switch indicator will turn ON.
• Confirm that the compressor clutch engages (sound or visual inspection).
NOTE:
If current mode setting is DEF or D/F, compressor clutch may already be engaged.
If NG, go to trouble diagnosis procedure for ATC-96, "
Magnet Clutch Circuit" .
If OK, continue with next check.
CHECKING AUTO MODE
1. Press AUTO switch.
2. Display should indicate AUTO.
• If ambient temperature is warm, and selected temperat ure is cool, confirm that the compressor clutch
engages (sound or visual inspection). (Discharge air and blower speed will depend on ambient, in-vehi-
cle, and set temperatures.)
If NG, go to trouble diagnosis procedure for ATC-52, "
Power Supply and Ground Circuit for Front Air Control" ,
then if necessary, trouble diagnosis procedure for ATC-96, "
Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go to malfunction Simulation Tests in AT C -
32, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" and perform tests as outlined to simu-
late driving conditions environment . If symptom appears. Refer to ATC-32, "
How to Perform Trouble Diagnosis
for Quick and Accurate Repair", ATC-32, "How to Perform Trouble Diagnosis for Quick and Accurate Repair"
and perform applicable trouble diagnosis procedures.
Operational Check (Rear)INFOID:0000000003533250
The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1. Turn the rear blower control dial to swit ch position "1". Blower should operate on low speed.
2. Turn the rear blower control dial counterclockwis e to switch position "2", "3", and "4" until all speeds are
checked.
3. Leave blower on MAX speed.
If NG, go to trouble diagnosis procedure for ATC-85, "
Rear Blower Motor Circuit" .
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Rotate temperature and mode dial fully counterclockwise.
2. Check for cold air at appropriate discharge air outlets. Conditions : Engine running and at normal operating temperature

Page 430 of 3061

INFINITI QX56 2007 Factory Service Manual
ATC-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
5.CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation from 16 °C (60 °F) to 32 °C (90 °F) in each
mode.
OK o

ATC-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
5.CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation from 16 °C (60 °F) to 32 °C (90 °F) in each
mode.
OK or NG
OK >> GO TO 6.
NG >> Repair as necessary.
6.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 7.
7.CHECK THE AIR MIX DOOR MOTOR PBR CIRCUIT
Perform diagnostic procedure for the air mix door motors. Refer to "Air Mix Door Motor Circuit" .
OK or NG
OK >> GO TO 8.
NG >> Repair PBR circuit or replace air mix door motor. Refer to ATC-141
.
8.RECHECK FOR CODES
Perform self-diagnosis. Refer to ATC-48, "
A/C System Self-Diagnosis Function" .
Are any self-diagnostic codes present?
YES >> Refer to ATC-48, "A/C System Self-Diagnosis Function" .
NO >> GO TO 9.
9.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
Air mix door control system components are:
• Front air control.
• Air mix door motors (Driver, Passenger, and rear)
• PBR (built-into air mix door motors)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The front air control receives data from the temperatur e selected by the driver side, passenger side, and rear.
The front air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is
applied to the other circuit, causing the appropriate air mix door motor to rotate. The direction of rotation is
determined by which circuit has voltage applied to it, and which one has ground applied to it. The front air con-
trol monitors the air mix door positions by measur ing the voltage signal on the PBR circuits of each door.
In AUTO mode the air mix, intake, mode door, and defrost door positions are set by the front air control which
determines the proper position based on inputs from the in-vehicle sensor, ambient sensor, optical sensor,
intake sensor, and the temperature selected by the driver and front and rear passengers.

Page 431 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-61
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Subsequently, HOT/COLD or DEFROST/VENT or FR ESH/RECIRCULATION operation is selected. The new
door position data is r

Page 437 of 3061

INFINITI QX56 2007 Factory Service Manual
TROUBLE DIAGNOSISATC-67
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1. Disconnect the air mix door mo tor (passenger) harness connec-
tor.
2. Check continuity between air mix door motor

Page 438 of 3061

INFINITI QX56 2007 Factory Service Manual
ATC-68
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Turn ignition switch ON.
2. Rotate temperature control dial (rear) to maximum heat.
3. Check voltage between front air control harness connector M5

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