INFINITI FX35 2007 Service Manual

TROUBLE DIAGNOSIS ATC-65
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Revision: 2006 July 2007 FX35/FX45
2. CHECK SIGNAL FOR UNIFIED METER AND A/C AMP.
Confirm A/C LAN signal between unified meter and A/C amp. har-
ness connector M57 terminal 43 and ground using an oscilloscope.
OK or NG
OK >> GO TO 3.
NG >> Replace unified meter and A/C amp.
3. CHECK POWER SUPPLY FOR EACH DOOR MOTOR
Check voltage between each door motor harness connector terminal
1 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK SIGNAL FOR EACH DOOR MOTOR
Confirm A/C LAN signal between each door motor harness connec-
tor terminal 3 and ground using an oscilloscope.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
Terminals
Vo l ta g e
(+)
( − )
Unified meter and A/
C amp. connector Terminal No.
M57 43 Ground
RJIA1987E
SJIA1453J
1 – Ground : Battery voltage
RJIA1988E
Door motor Terminals
Voltage
(+)
( − )
Con-
nector Terminal
No.
Mode M258 3
Ground
Air mix
(Driver
side) M252 3
Air mix
(Passen-
ger side) M257 3
Intake M253 3
RJIA1989E
SJIA1453J

ATC-66
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Check continuity between each door motor harness connector terminal 2 and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6. CHECK MOTOR OPERATION
1. Reconnect each door motor connector.
2. Turn ignition switch ON.
3. Confirm operation of each door motor.
OK or NG
OK >> (Return to operate normally.)

Poor contact in motor connector.
NG >> (Does not operate normally.)

GO TO 7.
7. CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect mode, air mix (driver side, passenger side), and intake door motor connectors.
3. Reconnect air mix (driver side, passenger side) and intake door motor connectors.
4. Turn ignition switch ON.
5. Confirm operation of air mix door motor (driver side, passenger side) and intake door motor.
OK or NG
OK >> [Air mix (driver side, passenger side) and intake door motors operate normally.]

Replace mode door motor.
NG >> [Air mix (driver side, passenger side) and intake door motors does not operate normally.]

GO TO 8.
8. CHECK MODE DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (driver side, passenger side) connectors.
3. Reconnect mode door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor and intake door motor.
OK or NG
OK >> (Mode and intake door motors operate normally.)

GO TO 10.
NG >> (Mode and intake door motors does not operate normally.)

GO TO 9.
2 – Ground : Continuity should exist.
RJIA1990E

TROUBLE DIAGNOSIS ATC-67
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Revision: 2006 July 2007 FX35/FX45
9. CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector.
3. Reconnect air mix door motor (driver side, passenger side) connectors.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor and air mix door motor (driver side, passenger side).
OK or NG
OK >> [Mode and air mix door motor (driver side, passenger side) operate normally.]

Replace intake door motor.
NG >> [Mode and air mix door motor (driver side, passenger side) does not operate normally.]

Replace display and A/C auto amp.
10. CHECK AIR MIX DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (driver side) connector.
3. Turn ignition switch ON.
4. Confirm operation of air mix door motor (passenger side).
OK or NG
OK >> [Air mix door motor (passenger side) operates normally.]

Replace air mix door motor (driver side).
NG >> [Air mix door motor (passenger side) does not operate normally.]

Replace air mix door motor (passenger side).

ATC-68
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Mode Door Motor CircuitNJS000E4
SYMPTOM

Air outlet does not change.

Mode door motor does not operate normally.
INSPECTION FLOW
*1AT C - 3 7 , "Discharge Air Flow"*2ATC-60, "Operational Check"*3ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to
6.
*4 ATC-103, "
Ambient Sensor Circuit"*5ATC-106, "In-vehicle Sensor Cir-
cuit"
*6ATC-109, "Sunload Sensor Circuit"
*7 AT C - 11 2 , "Intake Sensor Circuit"*8ATC-71, "Air Mix Door Motor Cir-
cuit"
*9ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 AT C - 6 4 , "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-130, "MODE DOOR MOTOR"*12ATC-41, "SYMPTOM TABLE"
SJIA1806E

TROUBLE DIAGNOSIS ATC-69
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Revision: 2006 July 2007 FX35/FX45
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:

Unified meter and A/C amp.

Mode 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

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 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.
SJIA1585E

ATC-70
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet set by the uni-
fied meter and A/C amp. Motor rotation is conveyed to a link which
activates the mode door.
DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnosis procedure. Refer to AT C - 6 4 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA0890E

TROUBLE DIAGNOSIS ATC-71
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Revision: 2006 July 2007 FX35/FX45
Air Mix Door Motor CircuitNJS000E5
SYMPTOM

Discharge air temperature does not change.

Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *2
ATC-103, "
Ambient Sensor Circuit"*3 ATC-106, "In-vehicle Sensor Circuit"
*4ATC-109, "Sunload Sensor Circuit"*5ATC-71, "Air Mix Door Motor Circuit"*6 ATC-53, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7 ATC-64, "
LAN System Circuit".*8 ATC-60, "Operational Check"*9ATC-41, "SYMPTOM TABLE"
*10ATC-112, "Intake Sensor Circuit"
SJIA1586E

ATC-72
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
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

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
RJIA1781E
RJIA1782E

TROUBLE DIAGNOSIS ATC-73
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Revision: 2006 July 2007 FX35/FX45
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.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to AT C - 6 4 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR CircuitNJS000E6
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 AT C - 6 4 , "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA0893E
RJIA0894E

ATC-74
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
Intake Door Motor CircuitNJS000E7
SYMPTOM

Intake door does not change.

Intake door motor does not operate normally.
INSPECTION FLOW
*1AT C - 6 0 , "Operational Check"*2AT C - 5 3 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to
6. *3
ATC-103, "
Ambient Sensor Circuit"
*4 ATC-106, "In-vehicle Sensor Circuit"*5ATC-109, "Sunload Sensor Circuit"*6 AT C - 11 2 , "Intake Sensor Circuit"
*7 AT C - 7 1 , "Air Mix Door Motor Circuit"*8AT C - 4 1 , "SYMPTOM TABLE"*9 AT C - 5 3 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 AT C - 6 4 , "
LAN System Circuit"*11ATC-123, "INTAKE DOOR MOTOR"
SJIA1807E