Blew the fuse in the cigarette adapter

Possibly but more likely you've disturbed the wiring and it is now causing a short circuit

Replace the lighter it is shorted out, the lighter is Held in by a big stamped nut on the bank of the threaded barrel.

I think only the lighter and obd are on that circuit. But, the 2 amp fuse is much, much too small for the lighter, or anything else for that matter. Replace the fuse with a 30 amp fuse, and try the code reader again. If the fuse continues to blow, replace the cigarette lighter assembly.

Wow what a great prank I can pull on my boys. The fuse is number 5 rated at 15 amps. Here is a link with the electrical information that you can click on.
https://secure.drivers.lexus.com/lexusdrivers/info/my-lexus/resources/download-owners-manual.do?docURI=http://tis.tmsnet.toyota.com/t3Portal/resources/jsp/siviewer/index.jsp?dir=om/OM30476U&href=xhtml/OM30476U_0023.html&locale=en

very common for the socket to short out internally. Inspect it then unplug it. If the fuse is ok after you unplg it then you need to replace the socket.

try to tighten lighter element to lighter handle, if this does not work replace the lighter assembly

sounds like it blew a fuse. First remove the coin and check all the fuses. An owners manual will tell you where the fuse is located.

ensure that you have replaced w the same rating of fuse, amp and voltage
also check for a possible broken part or wiring problem that could cause a short circuit

cheers

The cord for the roadmate 760 takes a 3 amp 250 volt fast blow fuse.