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Home >> Infiniti Truck >> 2010 >> QX56 RWD V8-5.6L (VK56DE) >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Component Tests and General Diagnostics >> Automatic Air Conditioner >> Air Mix Door Motor (Driver)

Air Mix Door Motor (Driver)





AIR MIX DOOR MOTOR


Air Mix Door Motor (Driver) Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.

SYMPTOM:
- Discharge air temperature does not change.
- Air mix door motor does not operate.

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (DRIVER)
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND





1. Turn ignition switch ON.
2. Rotate temperature control dial (driver) to 32�C (90�F).
3. Check voltage between A/C auto amp. harness connector M49 terminal 17 and terminal 18 while rotating temperature control dial (driver) to 18�C (60�F).





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK AIR MIX DOOR MOTOR (DRIVER) 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 17, 18 and ground.

17 - Ground : Continuity should not exist.
18 - Ground : Continuity should not exist.

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





1. Turn ignition switch ON.
2. Rotate temperature control dial (driver) to 32�C (90�F).
3. Check voltage between A/C auto amp. harness connector M49 terminal 17 and terminal 18 while rotating temperature control dial (driver) to 18�C (60�F).





Is the inspection result normal?
YES - GO TO 4.
NO - Replace A/C auto amp. Service and Repair.
4.CHECK AIR MIX DOOR MOTOR (DRIVER) 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 17 and terminal 18.

Continuity should exist.

Is the inspection result normal?
YES - GO TO 6.
NO - GO TO 5.
5.CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR OPEN





1. Disconnect the air mix door motor (driver) harness connector.
2. Check continuity between A/C auto amp. harness connector
M49 (A) terminal 17, 18 and the air mix door motor (driver) harness connector M147 (B) terminal 1, 6.

17 - 1 : Continuity should exist.
18 - 6 : Continuity should exist.

Is the inspection result normal?
YES - Replace air mix door motor (driver). 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. 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 air mix door motor (driver) harness connector.
2. Check continuity between air mix door motor (driver) harness connector M147 (B) terminal 3, 2 and A/C auto amp. harness connector M49 (C) terminal 3 and M50 (A) terminal 28.

28 - 3 : Continuity should exist.
3 - 2 : Continuity should exist.

Is the inspection result normal?
YES - Replace air mix door motor (driver). 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 6 and ground while rotating temperature control dial from 32�C (90�F) to 18�C (60�F).

Voltage : Approx. 0.5V - 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 6 and ground.

Continuity should not exist.

Is the inspection result normal?
YES - Replace A/C auto amp. 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 air mix door motor (driver) harness connector and A/C auto amp. harness connector.
3. Check continuity between air mix door motor (driver) harness connector M147 (B) terminal 4 and A/C auto amp. harness connector M49 (A) terminal 6.

Continuity should exist.

Is the inspection result normal?
YES - Replace air mix door motor (driver). Removal and Installation,
"Removal and Installation".
NO - Repair or replace harness as necessary.
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