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:

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 .

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.
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.

No : Go to 3.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the combination meter connector and ambient sensor connector.
3. Using the tester, measure the resistance between terminals.
  Connector & terminal
  
  (i97) No. 23 - (B104) No. 2:
  
  (i97) No. 24 - (B104) 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 (GROUND SHORT CIRCUIT) .
Using the tester, measure the resistance between terminals.

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.

No : Go to 5.
CHECK AMBIENT SENSOR .
Perform the inspection of ambient sensor unit. Ref. to AIR CONDITIONER>AMBIENT SENSOR .

Is the check result OK?

Yes : Go to 6.

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