Infiniti M35/M45 Y50. Manual — part 133
TROUBLE DIAGNOSIS
ATC-83
C
D
E
F
G
H
I
K
L
M
A
B
ATC
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, 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.
Air Mix Door Control Specification
RJIA4217E
RJIA1782E
ATC-84
TROUBLE DIAGNOSIS
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
ATC-71, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
Air Mix Door Motor PBR Circuit
NJS000GR
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
ATC-71, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"
.
RJIA4064E
RJIA4065E
TROUBLE DIAGNOSIS
ATC-85
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Intake Door Motor Circuit
NJS000GS
SYMPTOM
●
Intake door does not change.
●
Intake door motor does not operate normally.
INSPECTION FLOW
*1
ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 2 to 6.
*2
ATC-112, "Ambient Sensor Circuit"
*3
ATC-115, "In-vehicle Sensor Circuit"
*4
ATC-118, "Sunload Sensor Circuit"
*5
ATC-82, "Air Mix Door Motor Cir-
cuit"
*6
ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 13.
*7
*8
*9
*10
*11
ATC-121, "Intake Sensor Circuit"
RJIA4066E
ATC-86
TROUBLE DIAGNOSIS
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, upper ventilator door motor, air mix door motor and
intake door motor)
●
In-vehicle sensor
●
Ambient sensor
●
Sunload sensor
●
Intake sensor
System Operation
The intake door control determines intake door position based on the ambient temperature, the intake air tem-
perature and the in-vehicle temperature. When shifting mode position D/F, when the DEF or OFF switches are
pressed, or when A/C switch is OFF, the unified meter and A/C amp. sets the intake door at the FRE position.
Intake Door Control Specification
RJIA4214E
RJIA4067E
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