Two problems related to tail light switch have been reported for the 2009 Honda Odyssey. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Honda Odyssey based on all problems reported for the 2009 Odyssey.
Water in rear tail lights on the top and sides after raining.
Subject: 2008-2009-2010 Honda Odyssey tail light defects comments: 2008-2009-2010 Honda Odyssey tail lights are susceptible to water penetration which will eventually short out the tail lights. This applies to the portion of the tail light which is attached to the rear hatch door. Water accumulates in the white part of the lens which is at the bottom of the tail light in these model years (I. E. , the back up lights). There is apparently a design or manufacturing defect in the sealed light system. I have had both tail lights replaced in my 2010 Odyssey due to water penetration & collection. I have photographic evidence to support this claim.