B2579

B2578, B2579 FRONT IN-VEHICLE SENSOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
- If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC68, "DTC Logic".
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC69, "DTC Logic".






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- Refer to "Diagnosis Procedure" B266B.
NO- INSPECTION END


Diagnosis Procedure


1. CHECK FRONT IN-VEHICLE SENSOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect front in-vehicle sensor connector.
3.Turn ignition switch ON.
4.Check voltage between front in-vehicle sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 2.
NO- GO TO 4.

2. CHECK FRONT IN-VEHICLE SENSOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between front in-vehicle sensor harness connector and ground.





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

3. CHECK FRONT IN-VEHICLE SENSOR

Check front in-vehicle sensor. Refer to "Component Inspection" B266B.
Is the inspection result normal?
YES- Replace A/C auto amp. Refer to "Removal and Installation" Service and Repair.
NO- Replace front in-vehicle sensor. Refer to "FRONT A/C UNIT ASSEMBLY : Removal and Installation" Front A/C Unit Assembly.

4. CHECK FRONT IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect A/C auto amp. connector.
3.Check continuity between front in-vehicle sensor 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 FRONT IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT

Check continuity between front in-vehicle sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.

6. CHECK FRONT IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT

1.Turn ignition switch ON.
2.Check voltage between front in-vehicle sensor harness connector and ground.





Is the inspection result normal?
YES- Replace A/C auto amp. Refer to "Removal and Installation" Service and Repair.
NO- Repair harness or connector.


Component Inspection


1. CHECK FRONT IN-VEHICLE SENSOR

1.Turn ignition switch OFF.
2.Disconnect front in-vehicle sensor connector.
3.Check resistance between front in-vehicle sensor terminals.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace front in-vehicle sensor. Refer to "FRONT A/C UNIT ASSEMBLY : Removal and Installation" Front A/C Unit Assembly.