2009 t&c battery change...radio won't turn on???

internal backup battery in radio is defective

You could have a stuck button that is blocking the rest of the buttons from functioning. Check the hand controls on the steering and if all is ok, try get the radio out and unplug it. If this now gives you heater display and functionality the problem is on the radio itself.

Before you delve too deep, disconnect the battery for a few minutes. Sometimes they just get "confused" and need a reboot! Its worth a try!

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Disconnect Battery cable for 10 minutes or so and reconnect and You will probably have your problem fixed !

Get a new one, Switch is hooch on it,

try charging your battery or replacing it.. if the problem is not solve.. diagnose your charging system if it still charges juice to the battery.

i would check battery connections and test battery. a battery can have a bad cell and run lights but not have enough amps to spin a stater. if everything on battery is good i would suspect a bad starter

Your battery is most likely dead if your lights go out. Charge or change your battery, but your altenater maybe be bad. It recharges your battery, if it don't work your battery will die..

Will you please check the fuse box and check if there's is a busted fuse..Thanks

Check to see if you get power and ground at the radio. If you get power and ground then the radio may be faulty. Also if you get the radio out see if there is a fuse on the back of it and check it if there is one