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2005 impala. Installed new radio over several days. Had the battery disconnected thru most of this but i'm sure we ran the battery down. We have recharged the battery but now the car will not start. when we turn the key on to start but all it does is click. When the key goes back to run position the information lights flash - Battery, Security and service engine. Is this a "BCM", "Ignition" or a "Passcode" issue?
I have been dealing with this for a week now. I have now put the original radio back in. Now it will all that will come on the stock radio is the clock. Radio will not turn on and play.
Where should I go next?
 

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Have the battery tested to make sure it’s ok.
A bad battery will cause all sorts of problems.
 
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