Infiniti QX4 (R50). Manual — part 469
SHA967EE
RHA868H
Check body ground circuit for auto amp. with ignition switch OFF.
Check for continuity between terminal Nos. 32, 14 and body
ground.
Ohmmeter terminal
Continuity
(+)
(−)
32
Body ground
Yes
14 (Canada only)
If OK, check auto amp. ground circuit, see below.
I
If NG, check 7.5A fuses (Nos. 11 and 24, located in the fuse
block) and 15A fuses (Nos. 1 and 2, located in the fuse block).
I
If fuses are OK, check for open circuit in wiring harness.
Repair or replace as necessary.
I
If fuses are NG, replace fuse and check wiring harness for
short circuit. Repair or replace as necessary.
NOTE:
If OK, replace auto amp.
If NG, repair or replace harness.
TROUBLE DIAGNOSES
A/C System (Cont’d)
HA-74
Mode Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR (LAN)
=NBHA0090
SYMPTOM:
I
Air outlet does not change.
I
Mode door motor does not operate normally.
Inspection Flow
NBHA0090S01
Without Navigation System
NBHA0090S0101
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 System
NBHA0090S0102
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
=NBHA0052
Component Parts
NBHA0052S01
Mode 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 Operation
NBHA0052S02
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.
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
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