2005 INFINITI FX35 atc

TROUBLE DIAGNOSIS ATC-67
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AT C
Revision: 2005 July 2005 FX
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.
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. 1 – Ground : Battery voltage
RJIA1988E
Door motor
Terminals
Voltage
(+)
( − )
Con-
nector Terminal
No.
(wire color)
Mode M258 3 (L)
Ground
Air mix
(Driver
side) M252 3 (L)
Air mix
(Passen-
ger side) M257 3 (L)
Intake M253 3 (L)
RJIA1989E
HAK0652D
2 – Ground : Continuity should exist.
RJIA1990E

ATC-68
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
6. CHECK MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Reconnect each door motor connector.
4. Turn ignition switch ON.
5. 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 OPERATION OF AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR
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 OPERATION OF MODE DOOR MOTOR AND INTAKE DOOR MOTOR
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.
9. CHECK OPERATION OF MODE DOOR MOTOR AND AIR MIX DOOR MOTOR
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.

TROUBLE DIAGNOSIS ATC-69
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Revision: 2005 July 2005 FX
10. CHECK OPERATION OF AIR MIX DOOR MOTOR
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-70
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
Mode Door Motor CircuitAJS0014T
SYMPTOM:

Air outlet does not change.

Mode door motor does not operate normally.
INSPECTION FLOW
*1AT C - 3 7 , "Discharge Air Flow"*2ATC-61, "Operational Check"*3ATC-113, "Intake Sensor Circuit"
*4 AT C - 5 4 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *5
ATC-104, "
Ambient Sensor Circuit"*6ATC-107, "In-vehicle Sensor Circuit"
*7 AT C - 11 0 , "Sunload Sensor Circuit"*8ATC-73, "Air Mix Door Motor Cir-
cuit"
*9ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10 AT C - 6 6 , "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-131, "MODE DOOR MOTOR"*12ATC-42, "SYMPTOM TABLE"
RJIA1991E

TROUBLE DIAGNOSIS ATC-71
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Revision: 2005 July 2005 FX
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 LCU, mode door
motor LCU and intake door motor LCU.
The air mix door motor, 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 FRESH/RECIRCULATION operation is selected. The
new selection data are returned to the unified meter and A/C amp.
RJIA1777E

ATC-72
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the unified
meter and A/C amp. Motor rotation is conveyed to a link which acti-
vates 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 6 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA0890E

TROUBLE DIAGNOSIS ATC-73
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Revision: 2005 July 2005 FX
Air Mix Door Motor CircuitAJS0014U
SYMPTOM:

Discharge air temperature does not change.

Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 4 to 6. *2
ATC-104, "
Ambient Sensor Circuit"*3 ATC-107, "In-vehicle Sensor Circuit"
*4ATC-110, "Sunload Sensor Circuit"*5ATC-73, "Air Mix Door Motor Circuit"*6 ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7 ATC-66, "
LAN System Circuit".*8 ATC-61, "Operational Check"*9ATC-42, "SYMPTOM TABLE"
*10ATC-113, "Intake Sensor Circuit"
SJIA0546E

ATC-74
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
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 LCU, mode
door motor LCU and intake door motor LCU.
The air mix door motor, 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 FRESH/RECIRCULATION operation is selected. The
new selection data are returned to the unified meter and A/C amp.
Air Mix Door Control Specification
RJIA1781E
RJIA1782E