Air Mix Door Motor (Passenger)

AIR MIX DOOR MOTOR

Air Mix Door Motor (Passenger) Diagnosis Procedure

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

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)


1. CHECK AIR MIX DOOR MOTOR (PASSENGER) POSITION BALANCED RESISTOR (PBR) FEEDBACK

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





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

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






1.Turn ignition switch OFF.
2.Disconnect the front air control harness connector M49 (A) and the air mix door motor (passenger) harness connector M143 (B).
3.Check continuity between front air control harness connector
M49 (A) terminals 2, 14 and the air mix door motor (passenger)
harness connector M143 (B) terminals 1, 6.










4.Check continuity between front air control harness connector
M49 terminals 2, 14 and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace harness as necessary.

3. CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR (PASSENGER) POWER AND GROUND






1.Reconnect front air control harness connector.
2.Turn ignition switch ON.
3.Rotate temperature control dial (passenger) to 32�C (90�F).
4.Check voltage between front air control harness connector M49
terminal 2 and terminal 14 while rotating temperature control dial (passenger) to 18�
C (60�F) and back to 32�C (90�F).





Is the inspection result normal?
YES- GO TO 4.
NO- Replace front air control Service and Repair.

4. CHECK AIR MIX DOOR MOTOR (PASSENGER) 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 air mix door motor (passenger) harness connector M143 (B) terminals 2, 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
M50 (A) terminal 29 and air mix door motor (passenger) harness connector M143 (B) terminal 4.










2.Check continuity between front air control harness connector
M50 terminal 29 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 M50
terminal 29 and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Replace front air control. Service and Repair.

7. CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL






1.Reconnect the air mix door motor (passenger) harness connector M143.
2.Check voltage between front air control harness connector M50
terminal 29 and ground.





Is the inspection result normal?
YES- Inspect air mix door (passenger) for binding or mechanical failure. If air mix door (passenger) moves freely, replace front air control. Service and Repair.
NO- Replace the air mix door motor (passenger). Service and Repair.