Infiniti M35/M45 Y50. Manual — part 131
TROUBLE DIAGNOSIS
ATC-75
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ATC
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
Mode Door Motor Circuit
NJS000GO
SYMPTOM
●
Air outlet does not change.
●
Mode door motor does not operate normally.
INSPECTION FLOW
SJIA1761E
TROUBLE DIAGNOSIS
ATC-77
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ATC
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)
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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.
*1
*2
*3
ATC-121, "Intake Sensor Circuit"
*4
ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 2 to 6.
*5
ATC-112, "Ambient Sensor Circuit"
*6
ATC-115, "In-vehicle Sensor Circuit"
*7
ATC-118, "Sunload Sensor Circuit"
*8
ATC-82, "Air Mix Door Motor Cir-
cuit"
*9
ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*10
ATC-71, "DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11
*12
RJIA4056E
ATC-78
TROUBLE DIAGNOSIS
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
ATC-71, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA1778E
RJIA4057E
RJIA4058E
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