DTC B1507: External Air Temperature Open/Short-Circuit Detection
DTC detecting condition:
Open or short circuit in ambient sensor
Trouble symptom:
- Defective ambient temperature display
- Defective air conditioner operation
Wiring diagram:
Air conditioning system Refer to WIRING SYSTEM>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .
- CHECK DTC.
Read the DTC of the combination meter using the Subaru Select Monitor. Refer to COMBINATION METER (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B1507 displayed? (Current malfunction)
Yes: Go to 2.
No: Go to 6.
- CHECK CURRENT DATA.
Using the Subaru Select Monitor, display the «Ambient air temperature» from {Data Monitor}. Refer to COMBINATION METER (DIAGNOSTICS)>READ CURRENT DATA .
Is data displayed?
Yes: System is normal.
No: Go to 3.
- CHECK HARNESS.
- Turn the ignition switch to OFF.
- Disconnect the combination meter connector and ambient sensor connector.
- Using the tester, measure the resistance between terminals.
Connector & terminal
(i10) No. 36 - (F78) No. 2:
(i10) No. 27 - (F78) No. 1:
Is the resistance 10 Ω or less?
Yes: Go to 4.
No: Repair the open circuit of harness or replace harness.
- CHECK HARNESS.
Using the tester, measure the resistance between terminals.
Connector & terminal
(i10) No. 36 - Chassis ground:
(i10) No. 27 - Chassis ground:
Is the resistance 10 Ω or less?
Yes: Repair the short circuit of harness or replace harness.
No: Go to 5.
- CHECK AMBIENT SENSOR.
Perform the inspection of ambient sensor unit. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>AMBIENT SENSOR>INSPECTION .
Is the check result OK?
Yes: Go to 6.
No: Replace the sensor.
- CHECK CONNECTOR.
- Turn the ignition switch to OFF.
- Disconnect connectors.
Is there poor contact of connector?
Yes: Repair or replace the poor contact of connector.
No: A temporary change of voltage occurred.