Subaru Legacy 2002 Service Manual page 3335

DIAGNOSTICS CHART WITH TROUBLE CODE
Cruise Control System (Diagnostics)
8. Diagnostics Chart with Trouble Code
S003620
A: DTC 21, 24, 25 AND 2A CRUISE CONTROL MODULE BUILT-IN RELAY,
CPU RAM
S003620J92
DIAGNOSIS:
¼ Poor welding of built-in relay of cruise control module.
¼ Failure of built-in CPU RAM of cruise control module.
TROUBLE SYMPTOM:
¼ Cruise control is canceled and memorized cruise speed is also canceled.
¼ Once cruise control is canceled, cruise control cannot be set until the ignition switch and cruise control
main switch turns OFF, and then turns ON again.
NOTE:
Check input/output signal and vehicle speed signal with select monitor. When signals are in good condition,
failure is in cruise control module. (Check power supply and ground conditions of cruise control module.)
CC-28