Check Ambient Temperature Meter System Communication Circuit

Step	Check	Yes	No
1 CHECK AMBIENT SENSOR POWER SUPPLY . Disconnect the ambient sensor connector. Turn the ignition switch to ON. Measure the voltage between the ambient sensor connector and chassis ground. Connector & terminal (F78) No. 1 (+) - Chassis ground (-):	Is the voltage 4 V or more?	Go to step 2 .	Check the harness for open or short between the fuse and MFD.
2 CHECK HARNESS BETWEEN AMBIENT SENSOR AND COMBINATION METER ASSEMBLY . Disconnect the connector of combination meter assembly. Check harness between ambient sensor and combination meter assembly. Connector & terminal (F78) No. 1 - (i10) No. 27: (F78) No. 2 - (i10) No. 36:	Is harness normal?	Go to step 3 .	Repair or replace the harness.
3 CHECK AMBIENT SENSOR . Check the ambient sensor. Ref. to INSPECTION , Ambient Sensor.	Is the ambient sensor operating properly?	Go to step 4 .	Replace the ambient sensor.
4 CHECK AMBIENT TEMPERATURE DISPLAY . Connect the combination meter assembly connector. Install the 3 kΩ resistance between connector terminals of the ambient sensor. Turn the ignition switch to ON. Connector & terminal (F78) No. 1 - No. 2:	Does the ambient temperature display 25°C (77°F)?	Repair the poor contact between the ambient sensor and harness connector.	Go to step 5 .
5 CHECK CURRENT DATA . Using the Subaru Select Monitor, display the data of «Ambient Air Temperature». NOTE: For detailed operation procedures, refer to "Application help".	Is the ambient temperature of 25°C (77°F) output?	Go to step 6 .	Replace the meter - main assembly. Ref. to COMBINATION METER .
6 CHECK MFD . Remove the MFD. 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)?	Replace the MFD.	Replace the meter - main assembly. Ref. to COMBINATION METER .