Hi,
I found this article but have never tried, hope this helps.
"Sit in car, close door, turn IGN to ON (the last position before starting the engine, but no need to actually start engine) and set Odometer to full mileage reading (ie not trip A or cool.gif
Turn off, remove key
Re-insert key, turn back to ON (as above)
Press and hold ODO button for 30 seconds (may be OK with less, but 30 worked for me)
whilst still pressing ODO button, clip in seatbelt
b_on or b-off appears in ODO display
take finger off ODO button, and press again to change between b_on (bleeper on) and b_off (bleeper off)
unclip belt and turn off ignition to set"
Monte