Subaru 2009 IMPREZA Service Manual page 2721

Ambient Sensor (Auto A/C Model)
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
21.Ambient Sensor
(Auto A/C Model)
A: REMOVAL
1) Disconnect the ground cable from the battery.
2) Disconnect the ambient sensor connector.
3) Remove the ambient sensor from the radiator
lower panel.
AC-01749
B: INSTALLATION
Install in the reverse order of removal.
C: INSPECTION
Refer to "Ambient Sensor" of HVAC SYSTEM (AU-
TO A/C) (DIAGNOSTICS). <Ref. to AC(diag)-28,
AMBIENT SENSOR, Diagnostic Procedure for
Sensors.>
AC-41