Check Ambient Temperature Meter System Communication Circuit

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC PROCEDURE CHART

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. 2 (+) - Chassis ground (-):	Is the voltage 4 V or more?	Go to step 2 .	Check the harness for a open or short between the fuse and clock.
2 CHECK HARNESS BETWEEN AMBIENT SENSOR AND COMBINATION METER. Disconnect the combination meter connector. Measure the resistance between the ambient sensor connector and the combination meter connector. Connector & terminal (F78) No. 1 - (i10) No. 23: (F78) No. 2 - (i10) No. 24:	Is the resistance less than 10 Ω?	Go to step 3 .	Repair or replace the harness.
3 CHECK AMBIENT SENSOR. Remove the ambient sensor. < Ref. to REMOVAL , Ambient Sensor (Auto A/C Model). > Check the ambient sensor. < Ref. to AMBIENT SENSOR , Diagnostic Procedure for Sensors. >	Is the ambient sensor operating properly?	Go to step 4 .	Replace the ambient sensor.
4 CHECK AMBIENT TEMPERATURE DISPLAY. Connect the combination meter connector. Install the 3 Ω resistance to ambient sensor connector terminal. 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 AMBIENT TEMPERATURE OUTPUT DATA. Prepare the Subaru Select Monitor kit. Turn the ignition switch to ON (engine OFF) and run the "PC application for Subaru Select Monitor". On << System Selection Menu >> display, select {Integ. unit mode}. Select {Ambient Temperature}.	Does the ambient temperature display 25°C (77°F)?	Go to step 6 .	Replace the meter case assembly. < Ref. to COMBINATION METER . >
6 CHECK CLOCK. Remove the clock. 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 clock body.	Replace the meter case assembly.