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LAN System Circuit





TROUBLE DIAGNOSIS


LAN System Circuit

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.

70 - Ground: Battery voltage

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. harness connector M65 terminal 69 and ground using an oscilloscope.





OK or NG
OK - GO TO 3.
NG - Replace unified meter and A/C amp.
3.CHECK POWER SUPPLY FOR EACH DOOR MOTOR





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

1 - Ground: Battery voltage

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 connector 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.

2 - Ground: Continuity should exist.

OK or NG
OK - GO TO 6.
NG - Repair harness or connector.
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, passenger 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.
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, passenger side) operate normally.]
- Replace intake door motor.
NG - [Mode (driver side, passenger side), upper ventilator and air mix door motor (driver side, passenger 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).
12.CHECK AIR MIX DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Reconnect air mix door motor (passenger side) connector.
3. Turn ignition switch ON.
4. Confirm operation of air mix door motor (passenger side).
OK or NG
OK - [Air mix door motor (passenger side) operates normally.]
- Replace air mix door motor (driver side).
NG - [Air mix door motor (passenger side) does not operate normally.]
- Replace air mix door motor (passenger side).
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