edward is right
you can use the drs switch and set everything back to defaults but you will still need the manual because sometimes the defaults are not completely correct and it may leave you stranded with a code for an incorrect setting. I've seen this before and trust me, you WILL need the settings for that truck in front of you when you go through the setup routine.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.