Infiniti FX35 / FX45. Manual — part 116
ATC-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Unified meter and A/C amp.
• Air mix door motor (LCU)
• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
• In-vehicle sensor
• Ambient sensor
*1
ATC-43, "Self-Diagnosis Function"
see No. 4 to 6.
*2
ATC-86, "Ambient Sensor Circuit"
*3
ATC-88, "In-vehicle Sensor Circuit"
*4
ATC-91, "Sunload Sensor Circuit"
*5
ATC-62, "Air Mix Door Motor PBR
Circuit"
*6
ATC-43, "Self-Diagnosis Function"
see No. 13.
*7
.
*8
*9
ATC-32, "How to Perform Trouble
Diagnosis for Quick and Accurate
Repair"
*10
ATC-94, "Intake Sensor Circuit"
SJIA1586E
TROUBLE DIAGNOSIS
ATC-61
< SERVICE INFORMATION >
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ATC
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• Sunload sensor
• Intake sensor
System Operation
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCUs,
mode door motor LCU and intake door motor LCU.
The air mix door motors, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motors are attached to the heater & cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the unified meter and A/C amp. Motor rotation is then
conveyed through a shaft and the air mix door position feedback is
then sent to the unified meter and A/C amp. by PBR built-in air mix
door motor.
RJIA1781E
RJIA1782E
RJIA0893E
ATC-62
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to
Air Mix Door Motor PBR Circuit
INFOID:0000000001328187
SYMPTOM
• Discharge air temperature does not change.
• PBR circuit is open or shorted.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR
Perform diagnosis procedure. Refer to
Intake Door Motor Circuit
INFOID:0000000001328188
SYMPTOM
• Intake door does not change.
• Intake door motor does not operate normally.
INSPECTION FLOW
RJIA0894E
TROUBLE DIAGNOSIS
ATC-63
< SERVICE INFORMATION >
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D
E
F
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H
I
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A
B
ATC
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O
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SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
• Unified meter and A/C amp.
• Intake door motor (LCU)
• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
• In-vehicle sensor
• Ambient sensor
• Sunload sensor
*1
*2
ATC-43, "Self-Diagnosis Function"
see No. 4 to 6.
*3
ATC-86, "Ambient Sensor Circuit"
*4
ATC-88, "In-vehicle Sensor Circuit"
*5
ATC-91, "Sunload Sensor Circuit"
*6
ATC-94, "Intake Sensor Circuit"
*7
ATC-59, "Air Mix Door Motor Circuit"
*8
ATC-32, "How to Perform Trouble
Diagnosis for Quick and Accurate
Repair"
*9
ATC-43, "Self-Diagnosis Function"
see No. 13.
*10
*11
SJIA1807E
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