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

Air conditioning system <Ref. to AIR CONDITIONING , Air Conditioning System.>

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.	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}.	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.