Sorry guys I have been super busy with projects here at the shop...I havent been on in a couple days.
I totally newberfied myself on my trucks 'broken' TCM. Tony was nice enough to help me out with getting a TCM so I could drive my truck again, thanks again Tony!
Well me and HeepJeep drove to Tony's house (about an hour) and got the TCM. Came back, put it in my truck, still no PRND321 display and obviously the trans was still in hydraulic default. WTF. All the fuses were good in the UBEC....Im thinking why the hell does it seem like the tcm not getting power....but then it suddenly occured to me; I remembered that the
The TCM is on the IGN 0 circuit.....not the main IGN1 circuit.
IGN 0 is hot in accy/run/start. IGN 1 is only hot in run/start
I dont know if you guys have noticed, but when you turn the key to "accessory", basically the only thing that turns on in the whole truck is the PRND321 display and the radio. I dont know why GM thinks the TCM needs to be powered up in 'accessory'...the ECM and everything else doesnt power up until the key is in "RUN/ON"...but thats the way it is.
you can see where this is going. Theres a single IGN 0 fuse (because basically the TCM is the only thing on the "IGN 0" circuit) in the
interior fuse box hidden behind/above one of the relays, it was blown of course. I should have guessed that my mis-wired crap didnt actually fry the TCM and that it was probably something simple; all electronic modules in automobile applications are incredibly robust and basically all the inputs/outputs on all modules are protected against short-to-ground and short-to-voltage wiring conditions......seeing as how easy it is to get a bad connection/short circuit in automobile wiring, it only makes sense to build fault-protction into the computers....
duh