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Check Ambient Temperature Meter System Communication Circuit

  1. CHECK AMBIENT SENSOR POWER SUPPLY  .
    1. Disconnect the ambient sensor connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the ambient sensor connector and chassis ground.

      Connector & terminal

      (B480) No. 2 (+)-Chassis ground (-):

    Is the voltage 4 V or more?

    Yes:  Go to  2.

    No:  Check the harness for open or short between the fuse and ambient sensor.

  2. CHECK HARNESS BETWEEN AMBIENT SENSOR AND COMBINATION METER ASSEMBLY  .
    1. Disconnect the connector of combination meter assembly.
    2. Check harness between ambient sensor and combination meter assembly.

      Connector & terminal

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

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

    Is harness normal?

    Yes:  Go to  3.

    No:  Repair or replace the harness.

  3. CHECK AMBIENT SENSOR  .

    Check the ambient sensor.

    Is the ambient sensor operating properly? Ref. to AIR CONDITIONER>Ambient Sensor>INSPECTION .

    Yes:  Go to  4.

    No:  Replace the ambient sensor.

  4. CHECK AMBIENT TEMPERATURE DISPLAY  .
    1. Connect the combination meter assembly connector.
    2. Install the 3 kohm resistance between connector terminals of the ambient sensor.
    3. Turn the ignition switch to ON.

      Connector & terminal

      (B480) No. 1-No. 2:

    Does the ambient temperature display 25°C (77°F)?

    Yes:  Repair the poor contact between the ambient sensor and harness connector.

    No:  Go to  5.

  5. CHECK CURRENT DATA  .

    Display the [Ambient Air Temperature] data using Subaru Select Monitor.

    NOTE: For detailed operation procedures, refer to "Application help".

    Is the ambient temperature of 25°C (77°F) output?

    Yes:  Go to  6.

    No:  Replace the meter - main assembly. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .

  6. CHECK MFD  .
    1. Remove the MFD.
    2. Attach the ambient temperature display to another vehicle on which the ambient temperature display operates normally to check its operation.

    Does the ambient temperature display 25°C (77°F)?

    Yes:  Replace MFD.

    No:  Replace the meter - main assembly. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .

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