OK you probably just need to reset the passkey system. What you do is
1.turn the key to the start position (all the way forward) for 2 seconds.
2.return it to the run position.
3.leave it like that for 10 minutes-after 10 minutes the light should go off and you should be able to start the truck. You might have to do it more than once.
If that doesnt work out let me know. Or if you have actually changed the lock cylinder and are using a different key now also let me know. Any details will help.
Thanks for using JA
OK then do you want to give me some details on the repair you just did-exactly what you replaced as in the lock and key or the electrical part, and why they needed replacement. In the meantime-disconnect the battery for at least ten minutes to let the computer memory clear, then you can try it again. But answer me back about the details so I make sure I'm telling you the right thing.
Thanks for Accepting!
OK thanks. Are you disconnecting the battery? I'll get some more info now that I have that information-just let me know as soon as you try it again. That may take care of it since there was a serial comm code.
Let me know
What is your votage gauge reading? Did you do the passkey reset 10 minute thing again or was the light out when you hooked back up the battery? And it is not turning over right?
Right, but what I'm asking is do the gauges jump and the buzz happen when you try to start it? If so, go ahead and put cables on it again. Try to start it and if the light comes on go ahead and do the passkey thing. Let me know. I'm checking out why else that code would have been set except for the ignition switch in case none of this works out.
Well I am thinking that perhaps replacing the igition switch was not the answer to your problems. There is a TSB for that vehicle that lists those codes and refers to a bad BCM-body control module. The code u1000 refers to serial data comm loss-that could point to any module-it just indicates a comm problem.
If you can get it scanned again let me know and I'll be glad to help. I also still suspect a ground problem or low voltage. Let me know tomorrow what you find out. Sorry we couldnt fix it tonight.