Infiniti M35/M45 Y50. Manual - part 130

TROUBLE DIAGNOSIS

ATC-71

C

D

E

F

G

H

I

K

L

M

A

B

ATC

LAN System Circuit

NJS000GN

SYMPTOM: Mode door motors, upper ventilator door motor, air mix door motors and intake door motor does
not operate normally.

DIAGNOSIS PROCEDURE FOR LAN CIRCUIT

1. 

CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP.

1.

Turn ignition switch ON.

2.

Check voltage between unified meter and A/C amp. harness
connector M65 terminal 70 and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Replace unified meter and A/C amp.

2. 

CHECK SIGNAL FOR UNIFIED METER AND A/C AMP. 

Confirm A/C LAN signal between unified meter and A/C amp. har-
ness connector M65 terminal 69 and ground using an oscilloscope.

OK or NG

OK

>> GO TO 3.

NG

>> Replace unified meter and A/C amp.

RJIA4052E

70 – Ground

: Battery voltage

RJIA4053E

Terminals

Voltage

(+)

(

−

)

Unified meter and 

A/C amp. connector

Terminal No.

M65

69

Ground

RJIA4054E

SJIA1453J

ATC-72

TROUBLE DIAGNOSIS

3. 

CHECK POWER SUPPLY FOR EACH DOOR MOTOR

Check voltage between each door motor harness connector terminal
1 and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

4. 

CHECK SIGNAL FOR EACH DOOR MOTOR

Confirm A/C LAN signal between each door motor harness connec-
tor terminal 3 and ground using an oscilloscope.

OK or NG

OK

>> GO TO 5.

NG

>> Repair harness or connector.

5. 

CHECK MOTOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect each door motor connector.

3.

Check continuity between each door motor harness connector
terminal 2 and ground.

OK or NG

OK

>> GO TO 6.

NG

>> Repair harness or connector.

1 – Ground

: Battery voltage

RJIA1988E

Door motor

Terminals

Voltage

(+)

(

−

)

Con-

nector

Terminal 

No.

Mode (Driver 
side)

M252

3

Ground

Mode (Pas-
senger side)

M255

3

Upper venti-
lator

M254

3

Air mix 
(Driver side)

M253

3

Air mix (Pas-
senger side)

M256

3

Intake

M257

3

RJIA1989E

SJIA1453J

2 – Ground

: Continuity should exist.

RJIA1990E

TROUBLE DIAGNOSIS

ATC-73

C

D

E

F

G

H

I

K

L

M

A

B

ATC

6. 

CHECK MOTOR OPERATION

1.

Reconnect each door motor connector.

2.

Turn ignition switch ON.

3.

Confirm operation of each door motor.

OK or NG

OK

>> (Return to operate normally.)

●

Poor contact in motor connector.

NG

>> (Does not operate normally.)

●

GO TO 7.

7. 

CHECK UPPER VENTILATOR DOOR MOTOR, AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR 

OPERATION

1.

Turn ignition switch OFF.

2.

Disconnect mode (driver side, passenger side), upper ventilator, air mix (driver side, passenger side), and
intake door motor connectors.

3.

Reconnect upper ventilator, air mix (driver side, passenger side) and intake door motor connectors.

4.

Turn ignition switch ON.

5.

Confirm operation of upper ventilator, air mix door motor (driver side, passenger side) and intake door
motor.

OK or NG

OK

>> [Upper ventilator, air mix (driver side, passenger side) and intake door motors operate normally.]

●

GO TO 11.

NG

>> [Upper ventilator, air mix (driver side, passenger side) and intake door motors does not operate 

normally.]

●

GO TO 8.

8. 

CHECK MODE DOOR MOTOR, AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION

1.

Turn ignition switch OFF.

2.

Disconnect upper ventilator door motor connector.

3.

Reconnect mode door motor (driver side, passenger side) connectors.

4.

Turn ignition switch ON.

5.

Confirm operation of mode door motor (driver side, passenger side), air mix door motor (driver side, pas-
senger side) and intake door motor.

OK or NG

OK

>> [Mode (driver side, passenger side), air mix (driver side, passenger side) and intake door motors 

operate normally.]

●

Replace upper ventilator door motor.

NG

>> [Mode (driver side, passenger side), air mix (driver side, passenger side) and intake door motors 

does not operate normally.]

●

GO TO 9.

ATC-74

TROUBLE DIAGNOSIS

9. 

CHECK MODE DOOR MOTOR, UPPER VENTILATOR DOOR MOTOR AND INTAKE DOOR MOTOR 

OPERATION

1.

Turn ignition switch OFF.

2.

Disconnect air mix door motor (driver side, passenger side) connectors.

3.

Reconnect upper ventilator door motor connector.

4.

Turn ignition switch ON.

5.

Confirm operation of mode door motor (driver side, passenger side), upper ventilator door motor and
intake door motor.

OK or NG

OK

>> [Mode (driver side, passenger side), upper ventilator and intake door motors operate normally.]

●

GO TO 12.

NG

>> [Mode (driver side, passenger side), upper ventilator and intake door motors does not operate 

normally.]

●

GO TO 10.

10. 

CHECK MODE DOOR MOTOR, UPPER VENTILATOR DOOR MOTOR AND AIR MIX DOOR MOTOR 

OPERATION

1.

Turn ignition switch OFF.

2.

Disconnect intake door motor connector.

3.

Reconnect air mix door motor (driver side, passenger side) connectors.

4.

Turn ignition switch ON.

5.

Confirm operation of mode door motor (driver side, passenger side), upper ventilator door motor and air
mix door motor (driver side, passenger side).

OK or NG

OK

>> [Mode (driver side, passenger side), upper ventilator and air mix door motor (driver side, passen-

ger side) operate normally.]

●

Replace intake door motor.

NG

>> [Mode (driver side, passenger side), upper ventilator and air mix door motor (driver side, passen-

ger side) does not operate normally.]

●

Replace unified meter and A/C amp.

11. 

CHECK MODE DOOR MOTOR OPERATION

1.

Turn ignition switch OFF.

2.

Reconnect mode door motor (passenger side) connector.

3.

Turn ignition switch ON.

4.

Confirm operation of mode door motor (passenger side).

OK or NG

OK

>> [Mode door motor (passenger side) operates normally.]

●

Replace mode door motor (driver side).

NG

>> [Mode door motor (passenger side) does not operate normally.]

●

Replace mode door motor (passenger side).