2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 484Get this manual
SELECTABLE 4WD SYSTEM (Except TM model)
TROUBLESHOOTING
SELF-DIAGNOSTIC FUNCTION
When the 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 4WO system failure occurs (the indicator does not blink), perform same procedure as the Electric Shift (ES) system (page 22-5)4WD INDICATOR