Infiniti QX4 (R50). Manual — part 471
Air Mix Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR AIR MIX DOOR (LAN)
=NBHA0098
SYMPTOM:
I
Discharge air temperature does not change.
I
Air mix door motor does not operate.
Inspection Flow
NBHA0098S01
Without Navigation System
NBHA0098S0101
SHA246F
*1: HA-44
*2: HA-129
*3: HA-132
*4: HA-135
*5: HA-141
*6: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.
*10: HA-66
*12: HA-66
*13: HA-65
*14: HA-139
*15: HA-45
TROUBLE DIAGNOSES
Air Mix Door Motor
HA-82
With Navigation System
NBHA0098S0102
RHA871H
*1: HA-44
*2: HA-129
*3: HA-132
*4: HA-135
*5: HA-141
*6: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.
*10: HA-66
*12: HA-66
*13: HA-65
*14: HA-139
*15: HA-45
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Air Mix Door Motor (Cont’d)
HA-83
SYSTEM DESCRIPTION
=NBHA0059
Component Parts
NBHA0059S01
Air mix door control system components are:
1) Auto amp.
2) Air mix door motor (LCU)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System Operation
NBHA0059S02
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door and mode door
opening angle data to the air mix door motor LCU and mode door motor LCU.
The air mix door motor and mode door motor read their respective signals according to the address signal.
Opening angle indication signals received from the auto amplifier and each of the motor position sensors are
compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/
COLD or DEFROST/VENT operation is selected. The new selection data is returned to the auto amplifier.
RHA872H
TROUBLE DIAGNOSES
Air Mix Door Motor (Cont’d)
HA-84
Air Mix Door Control Specification
NBHA0059S03
RHA137G
RHA849E
COMPONENT DESCRIPTION
NBHA0060
The air mix door motor is attached to the heater unit. It rotates so
that the air mix door is opened or closed to a position set by the
auto amplifier. Motor rotation is then conveyed through a shaft and
the air mix door position is then fed back to the auto amplifier by
PBR built-in air mix door motor.
RHA504G
SHA522EA
CONTROL LINKAGE ADJUSTMENT
NBHA0099
Air Mix Door (Water Cock)
NBHA0099S01
1.
Install air mix door motor on heater unit and connect it to main
harness.
2.
Set up code No. 41 in Self-diagnosis STEP 4. Refer to HA-44.
3.
Move air mix door lever by hand and hold it in full cold posi-
tion.
4.
Attach air mix door lever to rod holder.
5.
Make sure air mix door operates properly when changing from
code No.
to
by pushing DEF switch.
Full cold
Full hot
6.
Set up code No.
in Self-diagnosis STEP 4.
7.
Attach water cock rod to air mix door lever and secure with clip.
8.
Rotate air mix door lever (CLOCKWISE completely) and hold
water cock rod and link lever in the full cold position.
9.
Attach water cock rod to link lever and secure with clip (white
mark on cable housing should be centered under the retaining
clip).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Air Mix Door Motor (Cont’d)
HA-85
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