Infiniti QX4 (R50). Manual — part 474
RHA593F
CONTROL LINKAGE ADJUSTMENT
=NBHA0093
Intake Door
NBHA0093S01
1.
Install intake door motor on intake unit and connect it to main
harness.
2.
Set up code No.
in Self-diagnosis STEP 4. Refer to HA-45.
3.
Move intake door link by hand and hold it in REC position.
4.
Attach intake door lever to rod holder.
5.
Make sure intake door operates properly when changing from
code No.
to
by pushing DEF switch.
REC
20% FRE
FRE
TROUBLE DIAGNOSES
Intake Door Motor (Cont’d)
HA-94
Blower Motor
TROUBLE DIAGNOSIS PROCEDURE FOR BLOWER MOTOR
=NBHA0094
SYMPTOM:
I
Blower motor operation is malfunctioning.
I
Blower motor operation is malfunctioning under out of starting fan speed control.
Inspection Flow
NBHA0094S01
Without Navigation System
NBHA0094S0101
SHA248FA
*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
*11: HA-65
*12: HA-66
*13: HA-139
*14: EL-108
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Blower Motor
HA-95
With Navigation System
NBHA0094S0102
RHA875H
*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
*11: HA-65
*12: HA-66
*13: HA-139
*14: EL-108
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-96
SYSTEM DESCRIPTION
=NBHA0062
Component parts
NBHA0062S01
Fan speed control system components are:
1) Auto amp.
2) Fan control amp.
3) A/C LAN system (PBR built-in mode door motor and air mix door motor)
4) In-vehicle sensor
5) Ambient sensor
6) Sunload sensor
7) Intake sensor
System Operation
NBHA0062S02
SHA006FF
Automatic Mode
NBHA0062S03
In the automatic mode, the blower motor speed is calculated by the automatic amplifier based on inputs from
the PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor. The blower motor applied
voltage ranges from approximately 5 volts (lowest speed) to 12 volts (highest speed).
The control blower speed (in the range of 5 to 12V), the automatic amplifier supplies a gate voltage to the fan
control amplifier. Based on this voltage, the fan control amplifier controls the voltage supplied to the blower
motor.
Starting Fan Speed Control
NBHA0062S04
Start Up From “COLD SOAK” Condition (Automatic mode)
NBHA0062S0401
In a cold start up condition where the engine coolant temperature is below 50°C (122°F), the blower will not
operate for a short period of time (up to 126 seconds). The exact start delay time varies depending on the
ambient and engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 126 seconds as described above.
After this delay, the blower will operate at low speed until the engine coolant temperature rises above 55°C
(131°F), at which time the blower speed will increase to the objective speed.
Start Up From Normal or “HOT SOAK” Condition (Automatic mode)
NBHA0062S0402
The blower will begin operation momentarily after the AUTO button is pushed. The blower speed will gradu-
ally rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-97
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