DTC B1507: Outside Temperature Sensor Open Detected

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 Ref. to WIRING SYSTEM (IMPREZA MODEL)>AIR CONDITIONING SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Combination Meter] using the Subaru Select Monitor. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1507 displayed? (Current malfunction)

   Yes:  Go to  2.

   No:  Go to  6.

2. CHECK DATA MONITOR  .

   Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Combination Meter]. Ref. to COMBINATION METER (DIAGNOSTICS)>DATA MONITOR .

   • Ambient air temperature

   Is [Ambient air temperature] displayed?

   Yes:  Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE:

   In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause. 

   No:  Go to  3.

3. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the meter connector and ambient sensor connector.
   3. Using the tester, measure the resistance between terminals.

      Connector & terminal 

      (i10) No. 23 - (B480) No. 2:

      (i10) No. 24 - (B480) No. 1:

   Is the resistance 10 Ω or less?

   Yes:  Go to  4.

   No:  Repair the open circuit of harness or replace harness.

4. CHECK HARNESS (GROUND SHORT CIRCUIT)  .

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (i10) No. 23 - Chassis ground:

   (i10) No. 24 - Chassis ground:

   Is the resistance 10 Ω or less?

   Yes:  Repair the short circuit of harness or replace harness.

   No:  Go to  5.

5. CHECK AMBIENT SENSOR  .

   Perform the inspection of ambient sensor unit. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>AMBIENT SENSOR .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Replace the sensor. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>AMBIENT SENSOR .

6. CHECK CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect connectors.

   Is there poor contact of connector?

   Yes:  Repair or replace the poor contact of connector.

   No:  Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE:

   In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.