2001 INFINITI QX4 Ac system

Mode Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR (LAN)=NBHA0090SYMPTOM:
IAir outlet does not change.
IMode door motor does not operate normally.
Inspection FlowNBHA0090S01Without Navigation SystemNBHA0090S0101
SHA245F
*1: HA-25
*2: HA-66
*3: HA-44
*4: HA-45
*5: HA-129*6: HA-132
*7: HA-135
*8: HA-141
*9: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.*10: HA-78
*11: HA-81
*12: HA-66
*13: HA-65
*14: HA-139
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Mode Door Motor
HA-75

With Navigation SystemNBHA0090S0102
RHA869H
*1: HA-25
*2: HA-66
*3: HA-44
*4: HA-45
*5: HA-129*6: HA-132
*7: HA-135
*8: HA-141
*9: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.*10: HA-78
*11: HA-81
*12: HA-66
*13: HA-65
*14: HA-139
TROUBLE DIAGNOSES
Mode Door Motor (Cont'd)
HA-76

SYSTEM DESCRIPTION=NBHA0052Component PartsNBHA0052S01Mode door control system components are:
1) Auto amp.
2) Mode door motor (LCU)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System OperationNBHA0052S02The 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.
RHA870H
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Mode Door Motor (Cont'd)
HA-77

Air Mix Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR AIR MIX DOOR (LAN)=NBHA0098SYMPTOM:
IDischarge air temperature does not change.
IAir mix door motor does not operate.
Inspection FlowNBHA0098S01Without Navigation SystemNBHA0098S0101
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.
*7: HA-78
*8: HA-85
*9: HA-85*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 SystemNBHA0098S0102
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.
*7: HA-78
*8: HA-85
*9: HA-85*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=NBHA0059Component PartsNBHA0059S01Air 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 OperationNBHA0059S02The 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

Intake Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR INTAKE DOOR=NBHA0092SYMPTOM:
IIntake door does not change.
IIntake door motor does not operate normally.
Inspection FlowNBHA0092S01Without Navigation SystemNBHA0092S0101
SHA247F
*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.
*7: HA-90
*8: HA-94
*9: HA-66*10: HA-45
*11: HA-66
*12: HA-65
*13: HA-139
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Intake Door Motor
HA-87

With Navigation SystemNBHA0092S0102
RHA873H
*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.
*7: HA-90
*8: HA-94
*9: HA-66*10: HA-45
*11: HA-66
*12: HA-65
*13: HA-139
TROUBLE DIAGNOSES
Intake Door Motor (Cont'd)
HA-88