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

Failure detection pattern :

Detection by a single system (Primary Failure)

Wiring diagram :

Combination meter system Ref. to WIRING SYSTEM>COMBINATION METER SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to COMBINATION METER (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

BASIC INSPECTION .
Before performing the diagnosis, perform basic inspection. Ref. to COMBINATION METER (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION .
NOTE:
- Check the battery and its installation condition.
- Check the related fuse.
- Visually check that the related connectors are properly connected.
  Also, check the related ground terminal for looseness and corrosion.
Is the check result OK?

Yes : GO TO 2.

No : Repair the defective part.
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 code)

Yes : GO TO 3.

No : GO TO 7.
CHECK DATA MONITOR .
Using the Subaru Select Monitor, read data of [Ambient air temperature] in the [Data Monitor] of [Combination Meter]. Ref. to COMBINATION METER (DIAGNOSTICS)>DATA MONITOR .

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.

After the repair, GO TO 8.

No : GO TO 4.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from the combination meter.
3. Disconnect the connector from ambient sensor.
4. Using a tester, measure the resistance between the combination meter connector and ambient sensor connector.
  Connector & terminal
  
  (i97) No. 23 - (B104) No. 2 :
  
  (i97) No. 24 - (B104) No. 1 :
Is the resistance 10 Ω or less?

Yes : GO TO 5.

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

After the repair, GO TO 8.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Use a tester to measure the resistance between the combination meter connector and chassis ground.

Connector & terminal

(i97) No. 23 - Chassis ground :

(i97) No. 24 - Chassis ground :

Is the resistance 10 Ω or less?

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

After the repair, GO TO 8.

No : GO TO 6.
CHECK AMBIENT SENSOR .
Perform the inspection of ambient sensor unit. Ref. to AIR CONDITIONER>AMBIENT SENSOR>INSPECTION .

Is the check result OK?

Yes : GO TO 7.

No : Replace the ambient sensor. Ref. to AIR CONDITIONER>AMBIENT SENSOR .

After replacement, GO TO 8.
CHECK CONNECTOR .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from the combination meter.
3. Disconnect the connector from ambient sensor.
4. Check connectors for poor connections.
Is there poor contact of connector?

Yes : Repair or replace the poor contact of connector.

After the repair, GO TO 8.

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.

After the repair, GO TO 8.
CHECK REPAIR .
1. Perform the inspection mode corresponding to DTC. Ref. to COMBINATION METER (DIAGNOSTICS)>INSPECTION MODE>OPERATION .
2. Confirm that DTC or cancel code is not stored and the malfunction is eliminated.
Is the check result OK?

Yes : Finish the diagnosis.

No : Perform the diagnosis according to the basic diagnostic procedure. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .