Why dose my radio not work in my Toyota aveis after taking battery off

Sounds like it needs the code inputting, mine did the same. Now, what the code is?????
Maybe if you post the make and serial number on here someone may be able to help. It maybe written down in your manual etc.

They didn't mess up the connector, you radio has an anti-theft code and it must be put in before the radio will work. IF they would have kept 12volts attached to the battery cables when they replaced the battery all would be well, but once the power is completely disconnecting from the car you must have the anti-theft code for the radio. If you are lucky someone wrote it down in the owners manual if not you will need the serial number off of the radio to obtain it from the dealer.

Have the CPU program reset by using a code reader . When the battery is removed the CVPU program becomes corrupted . As to the radio you will need the radio security code to re set it.

you need a 4 digit code to put in the radio to make it work again. should be with the paper work of the car if not you may be able to get the code from toyota but it may cost a bit. would first remove the radio as some times the code has been written on the radio some were if it has been removed before.

dealership has to reprogram radio code,some times radio code reset be in the owners manual in glove compartment.

It can be issue with radio fuse or wiring issue of radio.
First test the radio fuse.If its blown out,then replace it.If the fuse i checked ok,then its radio wiring issue.Test the voltage.
Check out few help links provided below,related to car radio problems:---Click the link below:---
Radio Controlling Fuse Location? http://howtobyme.blogspot.in/2012/05/2003-lincoln-aviator-radio-controlling.html

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No clock, radio, gps, climate control After Battery Cross Jumped? http://whatisbyme.blogspot.in/2012/05/2006-lexus-ls430-no-clock-radio-gps.html----------
XM satellite radio interface kit Connection? http://technoanswers.blogspot.in/2012/04/toyota-avalon-toyota-xm-satelite-radio.html
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Radio Power Antenna wiring diagram? http://technoanswers.blogspot.in/2012/02/radio-power-antenna-wiring-diagram-for.html

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Where is Radio Fuse located on 2007 Dodge charger?

http://schematicsdiagram.blogspot.com/2011/12/where-is-radio-fuse-located-on-2007.html

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2006 Ford Expedition radio not powering ON? http://technoanswers.blogspot.com/2012/01/2006-ford-expedition-radio-not-powering.html

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How to reset Radio code after car battery is died? http://howtobyme.blogspot.com/2011/12/how-to-reset-radio-code-after-car.html

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These details will help.
Thanks.

it does sound like the alternator but i would get the battery charged and then have someone to check the charging system and the fuses......get the battery charged first so they want try to sell you a battery and an alt. cause there are a few people out there that want to take you.....

it sounds like the battery has a problem with it and needs replacing,as you try to start the truck it pulls all the voltage out of the battery(which is very little in the battery)causing the clicking sound you hear,make sure the battery cable connections are tight and clean,both the terminals and cable ends.it takes very little voltage to power up a radio or lights and they probably stop working shortly after they are turned on.

If you have disconected your battery and radio lost power,you have to reset it with secure code.you can fin the code in your manual.

Go into Toyota and take your registration with some form of Picture ID and for a fee they will be able to get you the code for that radio. Good Luck