Infiniti G20 (P11). Manual — part 430
1
CHECK POWER SUPPLY FOR AUTO AMP. (LCU) SIDE
Do approx. 12 volts exist between auto amp. (LCU) harness terminal No. 21 and body ground?
SHA966EB
NOTE:
If the result is NG or No after checking circuit continuity, repair harness or connector.
Yes or No
Yes
©
GO TO 2.
No
©
Replace auto amp. (LCU).
2
CHECK SIGNAL FOR AUTO AMP. (LCU) SIDE
Do approx. 5.5 volts exist between auto amp. (LCU) terminal No. 16 and body ground?
SHA965EB
NOTE:
If the result is NG or No after checking circuit continuity, repair harness or connector.
Yes or No
Yes
©
GO TO 3.
No
©
Replace auto amp. (LCU).
3
CHECK POWER SUPPLY FOR MOTOR SIDE
Do approx. 12 volts exist between door motor (LCU) harness terminal No. 21 and body ground?
SHA172F
Yes or No
Yes
©
GO TO 4.
No
©
Repair harness or connector.
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-51
4
CHECK SIGNAL FOR MOTOR SIDE
Do approx. 5.5 volts exist between door motor (LCU) terminal No. 14 and body ground?
RHA048H
Yes or No
Yes
©
GO TO 5.
No
©
Repair harness or connector.
5
CHECK MOTOR GROUND CIRCUIT
Does continuity exist between door motor (LCU) harness terminal No. 32 and body ground?
RHA581H
Yes or No
Yes
©
GO TO 6.
No
©
Repair harness or connector.
6
CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK (Return to operate
normally)
©
Poor contacting the motor connector
NG (Does not operate
normally)
©
GO TO 7.
7
CHECK MODE DOOR MOTOR OPERATION
1. Disconnect the mode door motor and air mix door motor connector.
2. Reconnect the mode door motor and confirm the motor operation.
OK or NG
OK (Mode door motor
operates normally)
©
Replace the air mix door motor.
NG (Mode door motor
does not operate nor-
mally)
©
GO TO 8.
TROUBLE DIAGNOSES
AUTO
Mode Door Motor (Cont’d)
HA-52
8
CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect the mode door motor connector.
2. Reconnect the air mix door motor and confirm the air mix door motor operation.
OK or NG
OK (Air mix door motor
operates normally)
©
Replace mode door motor.
NG (Air mix door motor
does not operate nor-
mally)
©
Replace auto amp.
RHA046H
CONTROL LINKAGE ADJUSTMENT
NCHA0091
Mode Door
NCHA0091S01
1.
Install mode door motor on heater unit and connect it to main
harness.
2.
Set up code No. in Self-diagnosis STEP 4. Refer to HA-32.
3.
Move side link by hand and hold mode door in DEF mode.
4.
Attach mode door motor rod to side link rod holder.
5.
Make sure mode door operates properly when changing from
code No.
to
by pushing DEF switch.
VENT
B/L
B/L
FOOT
D/F
DEF
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-53
Air Mix Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR AIR MIX DOOR (LAN)
=NCHA0098
SYMPTOM:
I
Discharge air temperature does not change.
I
Air mix door motor does not operate.
INSPECTION FLOW
SHA174FA
*1: HA-32
*2: HA-92
*3: HA-95
*4: HA-99
*5: HA-104
*6: STEP-BY-STEP PROCEDURE
(HA-32), see No. 12.
*10: HA-42
*11: HA-41
*12: HA-102
*13: HA-32
TROUBLE DIAGNOSES
AUTO
Air Mix Door Motor
HA-54
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