Diagnosis Procedure

MODE DOOR MOTOR


Mode Door Motor Diagnosis Procedure

Regarding Wiring Diagram information, Automatic Air Conditioner.

SYMPTOM:
- Air outlet does not change.
- Mode door motor does not operate normally.
1.CHECK MODE DOOR MOTOR 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 front air control mode switch through all modes.





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





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










4. Check continuity between front air control 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 FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND





1. Reconnect front air control harness connector.
2. Turn ignition switch ON.





3. Press the mode switch to the D/F ( ) mode.
4. Check voltage between front air control 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 front air control. Service and Repair.
4.CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND





1. Turn ignition switch OFF.
2. Disconnect the front air control harness connectors.
3. Check continuity between front air control 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 front air control 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 front air control harness connector
M49 (A) terminal 7 and mode door motor harness connector
M142 (B) terminal 2.











2. Check continuity between front air control 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 FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK
SIGNAL





1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M49
(B) terminal 3, and M50 (A) terminal 28.





4. Check voltage between front air control harness connector M49 terminal 7 and ground.










Is the inspection result normal?
YES - GO TO 7.
NO - Replace front air control. Service and Repair, "Removal and
Installation".
7.CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL





1. Reconnect the mode door motor harness connector M142.
2. Check voltage between front air control harness connector M49 terminal 7 and ground.





Is the inspection result normal?
YES - Inspect mode door for binding or mechanical failure. If mode door moves freely, replace front air control. Service and Repair.
NO - Replace the mode door motor. Mode Door Motor, "Removal and Installation".