I am not sure what year your Odyssey is. I have a 2003 and the lighter came out so I had to dig in to re install it. In ...
I had to remove the two pins on the side of the lowest plastic panel and pull it out. Then I had to remove the CD holder by removing 6 screws (2 covered by the plastic panel removed first and 4 covered by the CD holder door). At that point, you have access to the lighter, which is two metal elements that screw onto each other and get connected to the wire.
How_do_you_remova_dash_panel_on_2000_odyssey_honda_to_replace_sterio 11-11-2008
This site gives step by step instructions here - http://www.marcelk.org/archives/71
The 1999 Honda Odyssey OBD 2 port is on far right edge of dash; next to console; faces down
The 2002 Honda Odyssey OBD 2 port is far right edge of dash; next to console; faces down
The Honda Odyssey OBD 2 port is on far right edge of dash; next to console; faces down
The 2001 Honda Odyssey OBD 2 port is on far right edge of dash; next to console; faces down
The fuse on the 1994 Honda Civic cigarette lighter is located under the dash on the driver's side.
replacing dash board lights
The 2003 Honda Odyssey OBD 2 port is on far right edge of dash; next to console; faces down
Passenger side under dash. Fuse # 11.
there is one under the dash that says radio
2005 was the first year for the dash mounted shifter.