Bad BCM?

[chevybob22]

Hi I'm new to the forum and i am having some big time electrical difficulty with my truck. Its an 04 chevy silverado 1500 with the 5.3L. Got home one night with it then went back out the next morning to start her up and noticed before i even turned the key my key fob, door locks, auto interior lights, and radio were all not working what so ever. i then cranked the car and it turned over and started for about a second or 2 and then sounds like it shuts itself off. my scanner tool is not communicating with the truck at all either. i have checked every fuse, some grounds, and the fuel pump and nothing there shows any sign of malfunction. i have researched a good amount on the problem and looks like it could be a possible bcm? just looking for further ways of pinpointing the problem without going to the dealer and spending $220 for them to do it. any type of advice or locations to check would be greatly appreciated.

Some prior history:

2 front wheel hubs changed 2 days before

code popped up for knock sensor week before(changed them yesterday as truck sat sadly broken in driveway)

and had the typical silverado problem with the abs causing skipping from bad sensor so i had the brake fuse out until i put the new hubs in. but fuse looked fine.

Thank you for your time

[gmtech4]

Abs skipping or unintentional is not the hubs but the sensors are dirty I hear

 

, don't go thinking BCM unless it's diagnosed properly ,

 

Why would you guess anything ?

 

Internet and electrical do not belong together in the same sentence .

 

Start with basics and maybe a scanner !!! How about that ??

[chevybob22]

no i actually had 2 bad bearings, the sensor went bad a while ago, and ive had the fuse out for about a year. but since i got the new sensors with the hubs i put the fuse back in. i dont know if its just coincidence that im having electrical problems now or if it is all tied together. i have a sort of schematic of the wiring i just dont know which wires that control what i should be testing to pin point the bcm or any other problems.

[txab]

Check the obvious first. Cables, connections, grounds, battery condition under load

[chevybob22]

checked all really important grounds such as under drivers seat, fuse box/engine ground, and bcm grounds. Everything checked out. tried following radio wire from/to bcm to check voltage but failed to find the splice box. getting a little frustrated and beginning to come to the realization that i may need to bring it to a show with a more knowledgeable scanner system.