Subaru Legacy 2002 Service Manual page 3151

HVAC System (Auto A/C) (Diagnostics)
3) Illumination control inspection
No. Point to check
1 Illumination switch
GENERAL DESCRIPTION
Switch operation
Illumination light illuminates and both switch
light and "set" temperature display dim.
¼ Switch lights:
Lighting switch "ON"
OFF → Green light illuminates.
ON → Green light illuminates.
Judgement standard
AC-8
Remarks
Green lights remain on
although OFF and OUT-
TEMP switches are ON.