B27A8

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
- If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC55, "DTC Logic".
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. "DTC Logic" Control Unit.
- If mode door motors DTC (B27A6 - B27A9) are detected, there is probably a disconnected connector or an open circuit in mode door motor drive power supply harness.






DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

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


Diagnosis Procedure


1. CHECK MODE DOOR MOTOR POWER SUPPLY

1.Turn power switch OFF.
2.Disconnect mode door motor connector.
3.Turn power switch ON.
4.Check voltage between mode door motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK A/C RELAY CIRCUIT

Check A/C relay circuit. Refer to "Diagnosis Procedure" A/C Relay.
Is the inspection result normal?
YES- Repair harness or connector between A/C relay and mode door motor.
NO- Repair or replace error-detected parts.

3. CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1.Turn power switch OFF.
2.Disconnect A/C auto amp. connector.
3.Check continuity between mode 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 MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT

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





Is the inspection result normal?
YES- GO TO 5.
NO- Repair harness or connector.

5. CHECK MODE DOOR MOTOR

Check mode door motor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Replace A/C control (A/C auto amp.). Refer to "Removal and Installation" Service and Repair.
NO- Replace mode door motor. Refer to "MODE DOOR MOTOR : Removal and Installation" Mode Door Motor.


Component Inspection


1. CHECK MODE DOOR MOTOR

1.Remove mode door motor. Refer to "MODE DOOR MOTOR : Removal and Installation" Mode Door Motor.
2.Check resistance between mode door motor terminals. Refer to applicable table for the normal value.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace mode door motor. Refer to "MODE DOOR MOTOR : Removal and Installation" Mode Door Motor.