Dash board service light?

take it to a repair shop and have it checked out or cover it with some black tape...

climb under the dashboard, reach up underneath somewhere and fiddle around 'til you find the right bulb.

Then you have two options:

1) Remove the bulb from the socket

2) Cut the wires leading to the socket

A third, less desirable option is to remove the fuse that operates all your dash lights. Check and make sure it doesn't turn your tail lights off though.

try to take off the battary terminals for some time than put it back on mybe 1 hour

Take it somewhere and find out what caused it to come on in the first place.

go to auto zone they do free scans,or meineke has a free scan cupon just came out last week in paper