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 amp.





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

1.Using CONSULT, 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. .
NO- Inspection End.


Diagnosis Procedure

Regarding Wiring Diagram information, With Color Display.

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. .
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.