Infiniti G20 (P11). Manual — part 429
SHA967EB
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.
If NG, repair or replace harness. Check 7.5A fuse (No. 5), 10A fuse
(No. 8) (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.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
A/C System (Cont’d)
HA-47
Mode Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR (LAN)
=NCHA0090
SYMPTOM:
I
Air outlet does not change.
I
Mode door motor does not operate normally.
INSPECTION FLOW
SHA173F
*1: HA-21
*2: HA-42
*3: HA-32
*4: STEP-BY-STEP PROCEDURE
(HA-32), see No. 7.
*5: HA-92
*6: HA-95
*7: HA-99
*8: HA-104
*9: STEP-BY-STEP PROCEDURE
(HA-32), see No. 12.
*10: HA-50
*11: HA-53
*12: HA-42
*13: HA-41
*14: HA-102
*15: HA-32
*16: HA-32
TROUBLE DIAGNOSES
AUTO
Mode Door Motor
HA-48
SYSTEM DESCRIPTION
=NCHA0052
Component Parts
NCHA0052S01
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
NCHA0052S02
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 mode door motor and air mix 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.
RHA045H
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Mode Door Motor (Cont’d)
HA-49
Mode Door Control Specification
NCHA0052S03
RHA192H
RHA046H
COMPONENT DESCRIPTION
NCHA0053
The mode door motor is attached to the heater unit. It rotates so
that air is discharged from the outlet set by the auto amplifier. Motor
rotation is conveyed to a link which activates the mode door.
RHA047H
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
AND AIR MIX DOOR MOTOR CIRCUIT
NCHA0104
SYMPTOM: Mode door motor and/or air mix door motor does
not operate normally.
TROUBLE DIAGNOSES
AUTO
Mode Door Motor (Cont’d)
HA-50
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