Car: 2006 Chrysler SRT8
Join Date: Apr 2007
Thanked 2,130 Times in 1,928 Posts
A battery with not enough juice to crank an engine will still turn on lights and buzzers. I'd make sure all your main power connections are tight and clean (battery + and -, starter leads and auxiliary post under the hood), replace the fuses mentioned above, then check your PCM connection harness at the box and the connector to make sure they are clean and not corroded.
Two other possibilities are 1) your PCM is fried, or, 2) your front control module (FCM) is fried.