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 and cooling unit assembly. It produces vacuum pressure due to air discharged from the heater and 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. Refer to 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. Refer to With Color Display or With Color Display.
Is DTC No."B2578" or "B2579" displayed?
YES - Perform trouble diagnosis for the in-vehicle sensor. Refer to "Diagnosis Procedure".
NO - Inspection End.




Diagnosis Procedure
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. Refer to With Color Display.
Is the inspection result normal?
YES - Replace A/C auto amp. Refer to With Color Display.
NO - Replace in-vehicle sensor. Refer to 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. Refer to 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. Refer to With Color Display.