No crank, gauges and radio not working, code p0449

2008 CHEVROLET SILVERADO
230,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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CECIL7
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Will not crank. I was driving one day when all of the gauges started jumping up and down then eventually stopped all together. Next the radio would turn off and on now stays off. It was cranking and starting occasionally then would shut off after a few seconds then eventually would stay running until I could get where I was going. Sometimes blower motor for a c would stay on after key was turned off. Have had evap 0449 and ops codes. Also, key immobilizer has shown up. Have relearned key gotten rid of that code still problem persists. Have fire to starter when manually jump in relay holes at fuse box. Replaced the fuse box, sn switch, ignition, cleaned all grounds all hot cables and say to have 12 v and continuity to everywhere I check. What's wrong? Could it be computer? I've tried to trace all wires, and have found nothing.
Jul 1, 2022 at 10:56 PM
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STRAILER
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This sounds like the BCM is going out, to be sure let's do a CAN scan which is the future of automotive repair. you can get a CAN scanner from Amazon for about $30.00. here is a video to show you how and a link to a scanner from Amazon. I have included how to change out the BCM in the diagrams below.

https://youtu.be/u-4syLc-ifQ

and

https://amzn.to/3OpAotj for the scanner

Check out the diagrams (below). Please let us know what happens.
Jul 2, 2022 at 5:07 PM
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CECIL7
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This was the problem I unhoomed it and it cranked I hope everybody finds this post that has this problem.
Jul 3, 2022 at 7:11 PM
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STRAILER
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Nice work, can I ask what we are looking at?
Jul 5, 2022 at 11:52 AM
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CECIL7
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That is the air bag module under the driver seat. Needless to say, it had a little corrosion. I live in Louisiana so I guess the humid weather got to it.
Jul 5, 2022 at 1:30 PM
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CECIL7
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I also tried cleaning it thinking that maybe it just lost ground, but it was too far gone. It no longer works so I just have it unplugged.
Jul 5, 2022 at 1:31 PM
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STRAILER
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It looks like it got wet, that will wreck it there are not waterproof. Here is how to replace it and be sure to clean the connectors. Check out the diagrams (Below). Please let us know what you find.
Jul 6, 2022 at 12:29 PM