(Front) Diagnosis Procedure

MODE DOOR MOTOR


Mode Door Motor (Front) Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.

SYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.
1.CHECK MODE DOOR MOTOR (FRONT) POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT-III, check "MODE FDBCK" in "DATA MONITOR" mode in "HVAC". CONSULT-III Function, "CONSULT-III Function (HVAC)".
3. Observe "MODE FDBCK" voltage while cycling A/C auto amp mode switch through all modes.






Is the inspection result normal?
YES - - Mode door motor is OK.
- Inspect mode door (front) for mechanical failure. Components.
NO - GO TO 2.
2.CHECK MODE DOOR MOTOR (FRONT) CIRCUITS FOR OPEN AND SHORT TO GROUND





1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector M49 (A) and the mode door motor (front) harness connector M142 (B).
3. Check continuity between A/C auto amp. harness connector
M49 (A) terminals 19, 20 and the mode door motor harness connector M142 (B) terminals 5, 6.










4. Check continuity between A/C auto amp. harness connector
M49 terminals 19, 20 and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace harness as necessary.
3.CHECK A/C AUTO AMP. FOR MODE DOOR MOTOR (FRONT) POWER AND GROUND





1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.






3. Press the mode switch to the D/F ( ) mode.
4. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing the mode switch to the VENT ( ), and then the B/L ( ) mode.






Is the inspection result normal?
YES - GO TO 4.
NO - Replace A/C auto amp. Service and Repair.
4.CHECK MODE DOOR MOTOR (FRONT) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND





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





4. Check continuity between A/C auto amp. harness connector
M49 (C) terminal 3, M50 (A) terminal 28 and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair or replace harness as necessary.
5.CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND





1. Check continuity between A/C auto amp. harness connector
M49 (A) terminal 7 and mode door motor harness connector
M142 (B) terminal 2.










2. Check continuity between A/C auto amp. harness connector
M49 terminal 7 and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace harness as necessary.
6.CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL





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





4. Check voltage between A/C auto amp. harness connector M49 terminal 7 and ground.










Is the inspection result normal?
YES - GO TO 7.
NO - Replace A/C auto amp. Service and Repair.
7.CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL





1. Reconnect the mode door motor (front) harness connector
M142.
2. Check voltage between A/C auto amp. harness connector M49 terminal 7 and ground.





Is the inspection result normal?
YES - Inspect mode door (front) for binding or mechanical failure. If mode door moves freely, replace A/C auto etc. Service and Repair.
NO - Replace the mode door motor (front). Removal And Installation.