2007 INFINITI M35 MOTOR

TROUBLE DIAGNOSIS
ATC-73
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AT C
Revision: 2007 April2007 M35/M45
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 UPPER VENTILATOR DOOR MOTOR, AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR
OPERATION
1. Turn ignition switch OFF.
2. Disconnect mode (driver side, passenger side), upper ventilator, air mix (driver side, passenger side), and
intake door motor connectors.
3. Reconnect upper ventilator, air mix (driver side, passenger side) and intake door motor connectors.
4. Turn ignition switch ON.
5. Confirm operation of upper ventilator, air mix door motor (driver side, passenger side) and intake door
motor.
OK or NG
OK >> [Upper ventilator, air mix (driver side, passenger side) and intake door motors operate normally.]

GO TO 11.
NG >> [Upper ventilator, air mix (driver side, passenger side) and intake door motors does not operate
normally.]

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

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

GO TO 9.

ATC-74
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
9. CHECK MODE DOOR MOTOR, UPPER VENTILATOR 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 upper ventilator door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor (driver side, passenger side), upper ventilator door motor and
intake door motor.
OK or NG
OK >> [Mode (driver side, passenger side), upper ventilator and intake door motors operate normally.]

GO TO 12.
NG >> [Mode (driver side, passenger side), upper ventilator and intake door motors does not operate
normally.]

GO TO 10.
10. CHECK MODE DOOR MOTOR, UPPER VENTILATOR 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 (driver side, passenger side), upper ventilator door motor and air
mix door motor (driver side, passenger side).
OK or NG
OK >> [Mode (driver side, passenger side), upper ventilator and air mix door motor (driver side, passen-
ger side) operate normally.]

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

Replace unified meter and A/C amp.
11 . CHECK MODE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Reconnect mode door motor (passenger side) connector.
3. Turn ignition switch ON.
4. Confirm operation of mode door motor (passenger side).
OK or NG
OK >> [Mode door motor (passenger side) operates normally.]

Replace mode door motor (driver side).
NG >> [Mode door motor (passenger side) does not operate normally.]

Replace mode door motor (passenger side).

TROUBLE DIAGNOSIS
ATC-75
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AT C
Revision: 2007 April2007 M35/M45
12. CHECK AIR MIX DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Reconnect air mix door motor (passenger 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-76
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Mode Door Motor CircuitNJS000GO
SYMPTOM

Air outlet does not change.

Mode door motor does not operate normally.
INSPECTION FLOW
SJIA1761E

TROUBLE DIAGNOSIS
ATC-77
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AT C
Revision: 2007 April2007 M35/M45
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, upper ventilator 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, upper ventilator door and intake door opening angle data to the air mix door
motor LCUs, mode door motor LCUs, upper ventilator door motor LCU and intake door motor LCU.
The air mix door motors, mode door motors, upper ventilator 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 opening angles. Subsequently, HOT/COLD, DEF/VENT, OPEN/SHUT and FRE/
REC operation is selected. The new selection data are returned to the unified meter and A/C amp.
*1ATC-37, "Discharge Air Flow"*2AT C - 6 5 , "Operational Check"*3ATC-121, "Intake Sensor Circuit"
*4ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*5AT C - 11 2 , "
Ambient Sensor Circuit"*6AT C - 11 5 , "In-vehicle Sensor Circuit"
*7ATC-118, "Sunload Sensor Circuit"*8AT C - 8 2 , "Air Mix Door Motor Cir-
cuit"
*9AT C - 5 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10ATC-71, "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-139, "MODE DOOR MOTOR"*12AT C - 4 1 , "SYMPTOM TABLE"
RJIA4056E

ATC-78
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motors are attached to the heater & cooling unit
assembly. 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 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 - 7 1 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA4057E
RJIA4058E

TROUBLE DIAGNOSIS
ATC-79
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AT C
Revision: 2007 April2007 M35/M45
Upper Ventilator Door Motor CircuitNJS000GP
SYMPTOM

Upper ventilator outlet does not change.

Upper ventilator door motor does not operate normally.
INSPECTION FLOW
*1ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2.*2AT C - 5 7 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5.*3AT C - 5 7 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 6.
*4ATC-118, "
Sunload Sensor Circuit"*5AT C - 5 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*6AT C - 7 1 , "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*7ATC-141, "UPPER VENTILATOR
DOOR MOTOR"
*8AT C - 6 5 , "Operational Check"*9AT C - 4 1 , "SYMPTOM TABLE"
SJIA1775E

ATC-80
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
SYSTEM DESCRIPTION
Component Parts
Upper ventilator door control system components are:

Unified meter and A/C amp.

Upper ventilator door motor (LCU)

A/C LAN system (PBR built-in mode door motor, upper ventilator door motor, air mix door motor and
intake door motor)

Sunload 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, upper ventilator door and intake door opening angle data to the air mix door
motor LCUs, mode door motor LCUs, upper ventilator door motor LCU and intake door motor LCU.
The air mix door motors, mode door motors, upper ventilator 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 opening angles. Subsequently, HOT/COLD, DEF/VENT, OPEN/SHUT and FRE/
REC operation is selected. The new selection data are returned to the unified meter and A/C amp.
RJIA4060E