2006 honda odyssey; turn key not even a sound. new battery nothing!! switched out starter nothing!!

Something is depleting the battery or the problem is the battery itself. (Those power antenna is the worst depletion of battery.) Unplug the negative terminal for five minutes and see if it starts or just unplug the negative terminal and charge the battery for ten minutes and then reconnect the negative to see if it starts. (Insert car key and turn to the second position.) Once, I even have a wire from the Starter's positive side ready to contact the battery positive. The car started this way.

Sounds like the starter motor may have gone bad. You might want to have the starter tested. It has to be taken off and then to a parts store for testing. If the starter tests good, it may be a problem in the wiring between the ignition switch and the starter solenoid (mounted on the starter motor). In that case, you will need some testing equipment to further test, equipment like a voltmeter used to check for power at the solenoid when key is held in start.

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I had this problem... The Starter itself had a short circuit (not the solenoid. It it were the solenoid, you would not get the "snap" you mentioned.). To get to the starter I had to take out the battery and the battery platform. It seems like a lot of work, but un the end it was easier than expected. I did the job in the parking lot of a Home Depot.

If you can get it to an auto parts store they can hook up a computer thing and tell you whats wrong. sounds alot like a bad starter.

Check the ignition key switch located at the back of the key lock mechanism. The electrical contacts in the switch may already be worn out.

Dead battery?

My wife's 2006 Odyssey had the same problem today.
I started with a new battery as that was easy to replace and was what I assumed was the problem...wrong. $90, but it was due for a new one anyway.
I would start with the starter relay/solenoid...less than $5.
I'm pulling the battery tomorrow to check all of the wire connections since I will not be able to get the relay until Tuesday.
If need be, I will remove the starter and take it somewhere to be tested so I don't have to drive the van and get stuck somewhere far from home.

If you are getting a clicking sound, then the starter is not getting enough power. There are three major things that must work in order for a starter to work. A good power source with good connections, a good starter solenoid (puts direct battery power to the starter motor when you turn the ignition to start), and a good starter motor. Usually a clicking sound indicates a fault in the first two items mentioned. If it were a blown fuse, you would get absolutely nothing when you turned the ignition key.

Try a jumpstart. Can you honk the horn or use any electronics in ACC mode?