B276B

B276B, B276C, B276D HUMIDITY SENSOR





DTC Logic

DTC DETECTION LOGIC

NOTE:
- If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. HAC-
94, "DTC Logic".
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Control Unit Control Unit Control Unit, "DTC Logic".






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 - SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.INSPECTION START
Confirm detected malfunction (A or B). SEE DTC Logic.
Which malfunction is detected?
A - GO TO 2.
B - GO TO 8.
2.CHECK HUMIDITY SENSOR (GLASS TEMPERATURE SENSOR) POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect humidity sensor connector.
3. Turn ignition switch ON.
4. Check voltage between humidity sensor harness connector and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - GO TO 3.
3.CHECK HUMIDITY SENSOR (GLASS TEMPERATURE SENSOR) POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between humidity sensor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connector.
4.CHECK
HUMIDITY SENSOR (GLASS TEMPERATURE SENSOR) POWER SUPPLY CIRCUIT FOR
GROUND SHORT
Check continuity between humidity sensor harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair harness or connector.
5.CHECK HUMIDITY SENSOR (GLASS TEMPERATURE SENSOR) POWER SUPPLY CIRCUIT FOR BATTERY SHORT
1. Turn ignition switch ON.
2. Check voltage between humidity sensor harness connector and ground.





Is the inspection result normal?
YES - GO TO 15.
NO - Repair harness or connector.
6.CHECK HUMIDITY SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between humidity sensor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES - GO TO 7.
NO - Repair harness or connector.
7.CHECK HUMIDITY SENSOR (GLASS TEMPERATURE SENSOR)
Check humidity sensor. SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 15.
NO - Replace humidity sensor. Removal And Installation.
8.CHECK HUMIDITY SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect humidity sensor connector.
3. Turn ignition switch ON.
4. Check voltage between humidity sensor harness connector and ground.





Is the inspection result normal?
YES - GO TO 12.
NO - GO TO 9.
9.CHECK HUMIDITY SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between humidity sensor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES - GO TO 10.
NO - Repair harness or connector.
10.CHECK HUMIDITY SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between humidity sensor harness connector and ground.





Is the inspection result normal?
YES - GO TO 11.
NO - Repair harness or connector.
11.CHECK HUMIDITY SENSOR POWER SUPPLY CIRCUIT FOR BATTERY SHORT
1. Turn ignition switch ON.
2. Check voltage between humidity sensor harness connector and ground.





Is the inspection result normal?
YES - GO TO 15.
NO - Repair harness or connector.
12.CHECK HUMIDITY SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between humidity sensor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES - GO TO 13.
NO - Repair harness or connector.
13.CHECK HUMIDITY SENSOR COMMUNICATION SIGNAL CIRCUIT FOR OPEN
Check continuity between humidity sensor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES - GO TO 14.
NO - Repair harness or connector.
14.REPLACE HUMIDITY SENSOR
Replace humidity sensor. Removal And Installation.
Is the inspection result normal?
YES - INSPECTION END
NO - GO TO 15.
15.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - Replace A/C auto amp.. Removal And Installation.
NO - Repair or replace malfunctioning parts.




Component Inspection
1.CHECK HUMIDITY SENSOR (GLASS TEMPERATURE SENSOR)
1. Turn ignition switch OFF.
2. Disconnect humidity sensor connector.
3. Check resistance between humidity sensor terminals. Refer to applicable table for normal value.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace humidity sensor. Removal And Installation.