B2579

B2578, B2579 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 HAC82, "DTC Logic".
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC83, "DTC Logic".






DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1.Turn ignition switch ON.
2.Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of HVAC.
3.Check if any DTC No. is displayed in the self-diagnosis results.
Is DTC detected?
YES- Refer to "Diagnosis Procedure" .
NO- Inspection End.


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" [1][2]Electrical Diagrams.

1. CHECK IN-VEHICLE SENSOR POWER SUPPLY

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





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

2. CHECK IN-VEHICLE SENSOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between front in-vehicle sensor harness connector and ground.
Revision: March 20122013 Infiniti JX





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

3. CHECK IN-VEHICLE SENSOR

Check in-vehicle sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Replace A/C auto amp. Refer to "Removal and Installation" Removal and Installation.
NO- Replace in-vehicle sensor. Refer to "Removal and Installation" Service and Repair.

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

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

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





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

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

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





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


Component Inspection


1. CHECK IN-VEHICLE SENSOR

1.Turn ignition switch OFF.
2.Disconnect in-vehicle sensor connector.
Revision: March 20122013 Infiniti JX
3.Check resistance between in-vehicle sensor terminals.





Is the inspection result normal?
YES- Inspection End.
NO- Replace in-vehicle sensor. Refer to "Removal and Installation" Service and Repair.
Revision: March 20122013 Infiniti JX