B27A4

B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
- If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Climate Control.
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Control Unit.
- If air mix door motors DTC (B27A2 - B27A5) are detected, there is probably a disconnected connector or an open circuit in air mix door motor drive power supply harness.






DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1.Turn ignition switch ON.
2.Select "Self Diagnostic Result" mode of "HVAC" using CONSULT.
3.Check DTC.
Is DTC detected?
YES- .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK AIR MIX DOOR MOTOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect air mix door motor connector.
3.Turn ignition switch ON.
4.Check voltage between air mix door motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 2.
NO- Repair harness or connector between air mix door motor and fuse.

2. CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect A/C auto amp. connector.
3.Check continuity between air mix door motor harness connector and A/C auto amp. harness connector.





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

3. CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT

Check continuity between air mix door motor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK AIR MIX DOOR MOTOR

Check air mix door motor. .
Is the inspection result normal?
YES- Replace A/C auto amp. Removal And Installation.
NO- Replace air mix door motor. Air Mix Door Motor.


Component Inspection


1. CHECK AIR MIX DOOR MOTOR

1.Remove air mix door motor. Air Mix Door Motor.
2.Check resistance between air mix door motor terminals. Refer to applicable table for the normal value.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace air mix door motor. Air Mix Door Motor.