Check Ambient Temperature Meter System Communication Circuit

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  (B640) 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.

1. Disconnect the connector of combination meter assembly.
2. Check harness between ambient sensor and combination meter assembly.

   Connector & terminal 

   (B640) No. 1 - (i10) No. 24:

   (B640) No. 2 - (i10) No. 23: Is harness normal?

Yes:  Go to  3.

No:  Repair or replace the harness.

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.

1. Connect the combination meter assembly connector.
2. Install the 3 kΩ resistance between connector terminals of the ambient sensor.

   Connector & terminal  (B640) No. 1 - No. 2:

3. Turn the ignition switch to ON.

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.

Display the [Ambient Air Temperature] data using Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS)>DATA MONITOR .

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

Yes:  Go to  6.

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

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 combination meter assembly. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .