Infiniti I30 (A33). Manual — part 523
MAIN POWER SUPPLY AND GROUND CIRCUIT CHECK
=NHHA0180
Power Supply Circuit Check
NHHA0180S03
Check power supply circuit for air conditioner system.
Refer to EL-11, “Wiring Diagram — POWER —”.
RHA368H
DIAGNOSTIC PROCEDURE
NHHA0181
SYMPTOM:
I
A/C system does not come on.
1
CHECK POWER SUPPLY CIRCUIT FOR AUTO AMP.
Measure voltage across terminal Nos. 26, 27, 33 and body ground.
SHA319FA
OK or NG
OK
©
GO TO 2.
NG
©
Check auto amp. ground circuit.
I
Check 10A fuse (Nos. 12 and 19, located in the fuse block) and 15A fuses (Nos. 51
and 52, located in the fuse block).
I
If fuses are OK, check for open circuit in wiring harness. Repair or replace as neces-
sary.
I
If fuses are NG, replace fuse and check wiring harness for short circuit. Repair or
replace as necessary.
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
A/C System (Cont’d)
HA-51
2
CHECK BODY GROUND CIRCUIT FOR AUTO AMP.
Does continuity exist between auto amp. Harness terminal Nos. 32, 14 and body ground?
SHA320F
Yes or No
Yes
©
Replace auto amp.
INSPECTION END
No
©
Repair or replace harness.
TROUBLE DIAGNOSES
A/C System (Cont’d)
HA-52
Mode Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR (LAN)
=NHHA0182
SYMPTOM:
I
Air outlet does not change.
I
Mode door motor does not operate normally.
INSPECTION FLOW
RHA370H
*1: HA-26
*2: HA-47
*3: HA-36
*4: HA-37
*5: HA-93
*6: HA-97
*7: HA-100
*8: HA-106
*9: FUNCTION CONFIRMATION
PROCEDURE (HA-37), see No.
13.
*10: HA-55
*11: HA-58
*12: HA-47
*13: HA-46
*14: HA-104
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Mode Door Motor
HA-53
SYSTEM DESCRIPTION
=NHHA0183
Component Parts
NHHA0183S01
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
NHHA0183S02
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door and
intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor
LCU.
The air mix door motor, mode door motor and intake 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 posi-
tion sensors are compared by the LCUs in each motor with the existing decision and opening angles.
Subsequently, HOT/COLD or OPEN/CLOSE or DEFROST/VENT operation is selected. The new selection
data is returned to the auto amplifier.
RHA382H
Mode Door Control Specification
NHHA0183S03
RHA384HA
TROUBLE DIAGNOSES
Mode Door Motor (Cont’d)
HA-54
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