2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 428Get this manual
SELECTABLE 4WD SYSTEM (FMFE models)
TROUBLESHOOTING
SELF-DIAGNOSTIC FUNCTION
When the integrated engine control module (ECM) detects problem in the system, the 4WD indicator shows the problem codeThe 4WD indicator denotes the problem codes by blinking from two to five times when the ignition switch is turned from OFF to ONIf no 4WD system failure occurs (the indicator does not blink), perform same procedure as the Electric Shift (ES) system (page 22-4)