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Check Ambient Temperature Meter System Communication Circuit

WARNING: This page is about a different car, the 2008 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK POWER SUPPLY FOR AMBIENT SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the ambient temperature sensor harness connector.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between the ambient temperature sensor harness connector terminal 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 a open or short between the fuse and clock.
2 CHECK HARNESS BETWEEN AMBIENT TEMPERATURE SENSOR AND COMBINATION METER. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the combination meter.
  3. Measure the resistance between the ambient temperature sensor harness connector terminal and combination meter harness connector terminal.

Connector & terminal 

(F78) No. 1(+) - (i10) 

No. 24: (F78) No. 2(+) - (i10) No. 23: 

 Is the resistance less than 10 Ω? Go to step 3.  Repair the wiring harness.
3 CHECK AMBIENT SENSOR. 
  1. Remove the ambient temperature sensor.
  2. Check the ambient temperature sensor. <Ref. to AMBIENT SENSOR , Diagnostic Procedure for Sensors . >
 Is the ambient temperature sensor operating properly? Go to step 4.  Replace the ambient sensor.
4 CHECK AMBIENT TEMPERATURE DISPLAY. 
  1. Connect the harness connector of the combination meter.
  2. Connect a resistance of 3 Ω between the harness connector terminals of the ambient temperature sensor.
  3. Turn the ignition switch to ON, and check the ambient air temperature display.
 Is the ambient air temperature indicator showing 25°C (77°F)? Repair the poor contact between the ambient air temperature sensor and harness connector. Go to step 5  .
5 CHECK AMBIENT AIR TEMPERATURE OUTPUT DATA. 
Connect the Subaru Select Monitor, and check the ambient temperature data in the data monitor of the integrated unit.		 Is the ambient air temperature indicator showing 25°C (77°F)? Go to step6.  Replace the meter case assembly.
6 CHECK COMBINATION METER. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the clock, and install a properly operating clock.
 Is the ambient air temperature indicator showing 25°C (77°F)? Replace the clock. Replace the meter case assembly.
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