With Color Display

B2578, B2579 IN-VEHICLE SENSOR





Description
In-vehicle Sensor





- The in-vehicle sensor (1) is located on instrument lower cover (LH).
- It converts variations in compartment air temperature drawn from the aspirator into a resistance value. It is then input into the A/C auto etc.

In-vehicle Sensor Circuit






Aspirator





The aspirator (1) is located on driver side of heater & cooling unit assembly. It produces vacuum pressure due to air discharged from the heater & cooling unit assembly, continuously taking compartment air in the aspirator.









DTC Logic

DTC DETECTION LOGIC

NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. With Color Display or With Color Display.






DTC CONFIRMATION PROCEDURE
1.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
1. Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of HVAC.
2. Check if any DTC No. is displayed in the self-diagnosis results.

NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. With Color Display or With Color Display.
Is DTC No."B2578" or "B2579" displayed?
YES - Perform trouble diagnosis for the in-vehicle sensor. With Color Display.
NO - Inspection End.




Diagnosis Procedure
Regarding Wiring Diagram information, With Navi or Without Navi.
1.CHECK IN-VEHICLE SENSOR POWER SUPPLY
1. Disconnect in-vehicle sensor connector.





2. Turn ignition switch ON.
3. Check voltage between in-vehicle sensor harness connector M34 terminal 1 and ground.

1 - Ground : Approx. 5V

Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 4.
2.CHECK CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP.





1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector M34 (A) terminal 2 and A/C auto amp. harness connector M37 (B) terminal 37.

2 - 37 : Continuity should exist.

Is the inspection result normal?
YES - GO TO 3.
NO - Repair harness or connector.
3.CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. With Color Display.
Is the inspection result normal?
YES - Replace A/C auto amp. With Color Display.
NO - Replace in-vehicle sensor. With Color Display.
4.CHECK CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP.





1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector M34 (A) terminal 1 and A/C auto amp. harness connector M37 (B) terminal 36.

1 - 36 : Continuity should exist.

4. Check continuity between in-vehicle sensor harness connector M34 (A) terminal 1 and ground.

1 - Ground : Continuity should not exist.

Is the inspection result normal?
YES - Replace A/C auto amp. With Color Display.
NO - Repair harness or connector.



Component Inspection
1.CHECK IN-VEHICLE SENSOR
1. Turn ignition switch OFF.
2. Disconnect in-vehicle sensor connector.
3. Check resistance between in-vehicle sensor terminals.





Is the inspection result normal?
YES - Inspection End.
NO - Replace in-vehicle sensor. With Color Display.