Subaru Legacy 2002 Service Manual page 3213

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) (RHD
MODEL)
HVAC System (Auto A/C) (Diagnostics)
B: DTC 22 OR –22 (AMBIENT SENSOR)
S001810K31
TROUBLE SYMPTOM:
Fan speed, outlets and inlets are not switched when AUTO or ECON switch is ON.
WIRING DIAGRAM:
B4M2447
AC-70