Air Mix Door Motor (Driver)

AIR MIX DOOR MOTOR

Air Mix Door Motor (Driver) Diagnosis Procedure

Regarding Wiring Diagram information, Automatic Air Conditioning.
- Discharge air temperature does not change.
- Air mix door motor does not operate.

1. CHECK AIR MIX DOOR MOTOR (DRIVER) POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLT-

AGE
1.Turn ignition switch ON.
2.Using CONSULT, check "DVR MIX FDBCK" in "DATA MONITOR" mode in "HVAC". CONSULT Function (HVAC).
3.Observe "DVR MIX FDBACK" voltage while rotating temperature control dial (driver) between 32�C (90�F)
and 18�C (60�F).





Is the inspection result normal?
YES- - Air mix door motor (driver) is OK.
- Inspect air mix door (driver) for mechanical failure and repair if necessary. If air mix door (driver)
is OK, Component Function Check for insufficient cooling or Insufficient Heating for insufficient heating.
NO- GO TO 2.

2. CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR OPEN AND SHORT TO GROUND

1.Turn ignition switch OFF.
2.Disconnect the A/C auto amp. harness connector M49 and the air mix door motor (driver) harness connector M147.
3.Check continuity between A/C auto amp. harness connector M49 terminals 17, 18 and the air mix door motor (driver) harness connector M147 terminals 5, 6.





4.Check continuity between A/C auto amp. harness connector M49 terminals 17, 18 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 AIR MIX DOOR MOTOR (DRIVER) POWER AND GROUND

1.Reconnect A/C auto amp. harness connector.
2.Turn ignition switch ON.
3.Rotate temperature control dial (driver) to 32�C (90�F).
4.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) and back to 32�C (90�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) 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 terminal 3, connector M50 terminal 28
and air mix door motor (driver) harness connector M147 terminals 1, 3.





4.Check continuity between A/C auto amp. harness connector M49 terminal 3, M50 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 terminal 6 and air mix door motor (driver) harness connector M147 terminal 2.





2.Check continuity between A/C auto amp. harness connector M49 terminal 6 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 terminal 3, and M50 terminal 28.





4.Check voltage between A/C auto amp. harness connector M49 terminal 6 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 air mix door motor (driver) harness connector M147.
2.Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.





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