Subaru Legacy 2002 Service Manual page 3336

DIAGNOSTICS CHART WITH TROUBLE CODE
Cruise Control System (Diagnostics)
B: DTC 22 VEHICLE SPEED SENSOR
S003620J93
DIAGNOSIS:
Disconnection or short circuit of vehicle speed sensor system.
TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancelled immediately.)
WIRING DIAGRAM:
B6M1648
CC-29