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. Climate Control.
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Control Unit.






DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select "Self Diagnostic Result" mode of "HVAC" using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES - 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. 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 3.
NO - Repair harness or connector.
3.CHECK FRONT IN-VEHICLE SENSOR
Check front in-vehicle sensor. B266B.
Is the inspection result normal?
YES - Replace A/C auto amp.. Service and Repair.
NO - Replace front in-vehicle sensor. .
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.. 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. .