Mode Door Motor (Front) Diagnosis Procedure

MODE DOOR MOTOR


Mode Door Motor (Front) Diagnosis Procedure


SYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND





1. Turn ignition switch ON.
2. Press the mode switch to the B/L ( ) mode.
3. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing the mode switch to the floor ( ) mode.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND





1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M49 terminal 19, 20 and ground.

19 - Ground : Continuity should not exist.
20 - Ground : Continuity should not exist.

Is the inspection result normal?
YES - Replace A/C auto amp. Refer to Service and Repair.
NO - Repair or replace harness as necessary.
3.CHECK A/C AUTO AMP. FOR GROUND AND POWER





1. Press the mode switch to the D/F ( ) mode.
2. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing the mode switch to the vent ( ) mode.





Is the inspection result normal?
YES - GO TO 4.
NO - Replace A/C auto amp. Refer to Service and Repair.
4.CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN





1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M49 terminal 19 and terminal 20.

Continuity should exist.

Is the inspection result normal?
YES - GO TO 6.
NO - GO TO 5.
5.CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN





1. Disconnect the mode door motor harness connector.
2. Check continuity between A/C auto amp. harness connector
M49 (A) terminal 19, 20 and the mode door motor harness connector M142 (B) terminal 5, 6.

5 - 19 : Continuity should exist.
6 - 20 : Continuity should exist.

Is the inspection result normal?
YES - Replace mode door motor. Refer to Removal and Installation.
NO - Repair or replace harness as necessary.
6.CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND





1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M50
(A) terminal 28 and M49 (B) terminal 3.





Is the inspection result normal?
YES - GO TO 8.
NO - GO TO 7.
7.CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND





1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 terminal 28 and ground.

Continuity should not exist.

Is the inspection result normal?
YES - Replace A/C auto amp. Refer to Service and Repair.
NO - Repair or replace harness as necessary.
8.CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS





1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 (A) terminal 28 and M49 (B) terminal 3.

Continuity should exist.

Is the inspection result normal?
YES - GO TO 10.
NO - GO TO 9.
9.CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN





1. Disconnect the mode door motor harness connector.
2. Check continuity between mode door motor harness connector
M142 (B) terminal 3, 1 and A/C auto amp. harness connector
M49 (C) terminal 3, M50 (A) terminal 28.

28 - 1 : Continuity should exist.
3 - 3 : Continuity should exist.

Is the inspection result normal?
YES - Replace mode door motor. Refer to Removal and Installation.
NO - Repair or replace harness as necessary.
10.CHECK PBR FEEDBACK VOLTAGE





1. Reconnect the A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49 terminal 7 and ground while cycling mode switch through all modes.

Voltage : Approx. 1V - 4.5V

Is the inspection result normal?
YES - GO TO 12.
NO - GO TO 11.
11.CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND





1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M49 terminal 7 and ground.

Continuity should not exist.

Is the inspection result normal?
YES - Replace A/C auto amp. Refer to Service and Repair.
NO - Repair or replace harness as necessary.
12.CHECK PBR FEEDBACK CIRCUIT FOR OPEN





1. Turn ignition switch OFF.
2. Disconnect the mode door motor harness connector and A/C auto amp. harness connector.
3. Check continuity between mode door motor harness connector
M142 (B) terminal 2 and A/C auto amp. harness connector M49
(A) terminal 7.

Continuity should exist.

Is the inspection result normal?
YES - Replace mode door motor. Refer to Removal and Installation, "Removal
and Installation".
NO - Repair or replace harness as necessary.