Air Mix Door Motor Diagnosis Procedure

AIR MIX DOOR MOTOR


Air Mix Door Motor Diagnosis Procedure


DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR
1.CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR





1. Turn ignition switch OFF.
2. Disconnect front air control connector and air mix door motor connector.
3. Check continuity between front air control harness connector
M52 terminal 2 and 3 and air mix door motor harness connector
M149 terminal 6 and 5.






Is inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace harness as necessary.
2.CHECK PBR REFERENCE SIGNAL VOLTAGE





1. Reconnect the front air control connector.
2. Turn ignition switch ON.
3. Check voltage between air mix door motor harness connector
M149 terminal 1 and ground.

1 - Ground : Approx. 5V

Is inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR AND FRONT AIR CONTROL





1. Turn ignition switch OFF.
2. Disconnect the front air control connector.
3. Check continuity between air mix door motor harness connector
M149 (B) terminal 1 and front air control harness connector M52 (A) terminal 23.





Is inspection result normal?
YES >> Replace front air control. Refer to .
NO >> Repair or replace harness as necessary.
4.CHECK PBR GROUND REFERENCE CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect the front air control connector.
3. Check continuity between air mix door motor harness connector M149 terminal 3 and front air control harness connector M52 terminal 26.

3 - 26 : Continuity should exist.

Is inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace harness as necessary.
5.CHECK PBR FEEDBACK SIGNAL





1. Reconnect the front air control connector and air mix door motor connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M52 terminal 22 and ground.
4. Rotate temperature control dial through complete range.

22 - Ground : Approx. 0V - 5V

Is inspection result normal?
YES >> Replace front air control. Refer to .
NO >> GO TO 6.
6.CHECK PBR FEEDBACK CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect the air mix door motor connector and front air control connector.
3. Check continuity between air mix door motor harness connector M149 terminal 2 and front air control harness connector M52 terminal 22.

2 - 22 : Continuity should exist.

Is inspection result normal?
YES >> Replace air mix door motor. Refer to .
NO >> Repair or replace harness as necessary.