LAN System Circuit

TROUBLE DIAGNOSIS


LAN System Circuit

SYMPTOM: Mode door motor, intake door motor and/or air mix door motor do not operate normally.






DIAGNOSTIC PROCEDURE
1.CHECK POWER SUPPLY FOR DOOR MOTORS
1. Turn ignition switch ON.





2. Check voltage between front air control connector M33 terminal
22 and ground.





OK or NG
OK - GO TO 2.
NG - Replace front air control. Service and Repair.
2.CHECK SIGNAL FOR DOOR MOTORS





Check voltage between front air control connector M33 terminal 18 and ground.





OK or NG
OK - GO TO 3.
NG - Replace front air control. Service and Repair.
3.CHECK POWER SUPPLY FOR MOTOR





Check voltage between mode door motor connector M51 terminal 1 and ground, between air mix door motor connector M34 terminal 1 and ground, and between intake door motor connector M48 terminal
1 and ground.





OK or NG
OK - GO TO 4.
NG - Replace harness or connector.
4.CHECK SIGNAL FOR MOTOR





Check voltage between mode door motor connector M51 terminal 3 and ground, between air mix door motor connector M34 terminal 3 and ground, and between intake door motor connector M48 terminal
3 and ground.






OK or NG
OK - GO TO 5.
NG - Replace harness or connector.
5.CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect door motor connectors.





3. Check continuity between mode door motor connector M51 terminal 2 and ground, between air mix door motor connector M34 terminal 2 and ground, and between intake door motor connector M48 terminal 2 and ground.






OK or NG
OK - GO TO 6.
NG - Replace harness or connector.
6.CHECK MOTOR OPERATION
Disconnect and reconnect the motor connectors and confirm the motor operation.
OK or NG
OK - (Returns to normal operation.)
- Motor connector contacts dirty or damaged
NG - (Does not operate normally.)
- GO TO 7.
7.CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTOR OPERATION
1. Disconnect the intake door motor connector.
2. Reconnect the mode door motor connector and air mix door motor connector, confirm the mode door motor and air mix door motor operation.
OK or NG
OK - (Mode door motor and air mix door motor operate normally.)
- Replace the intake door motor. Intake Door Motor.
NG - (Mode door motor and air mix door motor do not operate normally.)
- GO TO 8.
8.CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Disconnect mode door motor connector.
2. Reconnect the intake door motor connector, confirm the air mix door motor and intake door motor operation.
OK or NG
OK - (Air mix door motor and intake door motor operate normally.)
- Replace mode door motor. Mode Door Motor.
NG - (Air mix door motor and intake door motor do not operate normally.)
- GO TO 9.
9.CHECK INTAKE DOOR MOTOR AND MODE DOOR MOTOR OPERATION
1. Disconnect air mix door motor connector.
2. Reconnect mode door motor connector, confirm the intake door motor and mode door motor operation.
OK or NG
OK - (Intake door motor and mode door motor operate normally.)
- Replace air mix door motor. Air Mix Door Motor.
NG - (Intake door motor and mode door motor do not operate normally.)
- Replace front air control. Service and Repair.