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Home >> Infiniti >> 2012 >> M37x AWD V6-3.7L (VQ37VHR) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B275C

B275C




B275C, B275D, B275E INTAKE DOOR MOTOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
- If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. CAN Comm Circuit.
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Control Unit.
- If All of door motors DTC (B2750 - B276A) are detected, check door motor PBR power supply and ground circuit. With Forest Air (With Forest
Air).
- If All of door motors DTC (B2750 - B2764) are detected, check door motor PBR power supply and ground circuit. Without Forest Air (Without
Forest Air).






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 INTAKE DOOR MOTOR OPERATION

1.Turn ignition switch ON.
2.Operate FRE switch and REC switch (with Forest Air) or intake switch (without Forest Air).
3.Listen to intake sound and confirm air inlets change.
Does it operate normally?
YES- GO TO 8.
NO- GO TO 2.

2. CHECK INTAKE DOOR MOTOR DRIVE SIGNAL

1.Operate FRE switch and REC switch (with Forest Air) or intake switch (without Forest Air).
2.Check voltage between intake door motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 3.

3. CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect A/C auto amp. connector.
3.Disconnect intake door motor connector.
4.Check continuity between intake 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 INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR GROUND SHORT

Check continuity between intake door motor harness connector and ground.





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

5. CHECK INTAKE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR BATTERY SHORT

1.Turn ignition switch ON.
2.Check voltage between intake door motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 15.
NO- Repair harness or connector.

6. CHECK INTAKE DOOR MOTOR

Check intake door motor. .
Is the inspection result normal?
YES- GO TO 7.
NO- Replace intake door motor. Intake Door Motor.

7. CHECK INSTALLATION OF INTAKE DOOR MOTOR CONTROL LINKAGE

Check intake door motor control linkage is properly installed. Door Motor.
Is the inspection result normal?
YES- GO TO 15.
NO- Repair or replace malfunctioning parts.

8. CHECK INTAKE DOOR MOTOR PBR FEEDBACK SIGNAL

1.Operate FRE switch and REC switch (with Forest Air) or intake switch (without Forest Air).
2.Check voltage between A/C auto amp. harness connector and ground.





Is the inspection result normal?
YES- GO TO 15.
NO- GO TO 9.

9. CHECK INTAKE DOOR MOTOR PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN

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





Is the inspection result normal?
YES- GO TO 10.
NO- Repair harness or connector.

10. CHECK INTAKE DOOR MOTOR PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT

Check continuity between intake door motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 11.
NO- Repair harness or connector.

11. CHECK INTAKE DOOR MOTOR PBR POWER SUPPLY

1.Connect A/C auto amp. connector.
2.Turn ignition switch ON.
3.Check voltage between intake door motor harness connector and ground.





Is the inspection result normal?
YES- GO TO 13.
NO- GO TO 12.

12. CHECK INTAKE DOOR MOTOR PBR FEEDBACK PBR POWER SUPPLY CIRCUIT FOR OPEN

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





Is the inspection result normal?
YES- GO TO 15.
NO- Repair harness or connector.

13. CHECK INTAKE DOOR MOTOR PBR FEEDBACK PBR GROUND CIRCUIT

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





Is the inspection result normal?
YES- GO TO-14.
NO- Repair harness or connector.

14. CHECK INTAKE DOOR MOTOR PBR

Check intake door motor PBR. .
Is the inspection result normal?
YES- GO TO 15.
NO- Replace intake door motor. Intake Door Motor.

15. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
Is the inspection result normal?
YES- Replace A/C auto amp. Removal And Installation.
NO- Repair or replace malfunctioning parts.


Component Inspection (Motor)


1. CHECK INTAKE DOOR MOTOR

1.Turn ignition switch OFF.
2.Disconnect intake door motor connector.
3.Supply intake door motor terminals with battery voltage and check by visually and operation sound that intake door motor operates.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace intake door motor. Refer toIntake Door Motor.


Component Inspection (PBR)


1. CHECK INTAKE DOOR MOTOR PBR

Check resistance between intake door motor terminals.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace intake door motor. Refer toIntake Door Motor.
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