DTC B1507 External Air Temperature Open/Short-Circuit Detection: Wiring Diagram

Air conditioning system Ref. to the appropriate SYSTEM WIRING diagram article.

Fig 1: Air Conditioning System Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC.  Read the DTC of the meter using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC B1507 a current malfunction?	Go to step 2.	Go to step 6.
2 CHECK CURRENT DATA.  Using the Subaru Select Monitor, display the «External air temperature sensing value» from {Current Data Display & Save}. < Ref. to READ CURRENT DATA . >	Is data displayed?	System is normal.	Go to step 3.
3 CHECK HARNESS.  Turn the ignition switch to OFF. Disconnect the 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?	Go to step 4.	Repair the open circuit of harness or replace harness.
4 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?	Repair the short circuit of harness or replace harness.	Go to step 5.
5 CHECK AMBIENT SENSOR.  Perform the inspection of ambient sensor unit. < Ref. to INSPECTION , Ambient Sensor. >	Is the sensor normal?	Go to step 6.	Replace the sensor.
6 CHECK CONNECTOR.  Turn the ignition switch to OFF Disconnect connectors.	Is there poor contact of connector?	Repair or replace the poor contact of connector.	A temporary change of voltage occurred.