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  1. Dean E

    Module confusion and issues on my 2008 LMM

    Thank you! I was wondering what I might have been missing from the VICM and this could be it. Needless to say GM did not do a very good job of keeping this all within one or two splice packs. This low speed databus still goes out everywhere in this system. This would be so easy to trace down...
  2. Dean E

    Module confusion and issues on my 2008 LMM

    The page you sent showed 2 of 2 pages. I was just curious on what was on the first page. Dean
  3. Dean E

    Module confusion and issues on my 2008 LMM

    What is on page 1 of this? Dean
  4. Dean E

    Module confusion and issues on my 2008 LMM

    This is what I see in the prints. J1pin 1 which goes directly to the splice saver. Am I missing something? Dean
  5. Dean E

    Module confusion and issues on my 2008 LMM

    Not sure how? The X3 pin 19 is the low speed serial data enable buss. Dean
  6. Dean E

    Module confusion and issues on my 2008 LMM

    Yes, I have printed it out and looking at the wiring. I am curious on what the difference is between the light blue serial data com enable and the dark blue acc serial wake up serial data? Dean
  7. Dean E

    Module confusion and issues on my 2008 LMM

    I was just going to respond to my own question. I did find that, takes a few pages to get there. The diagram at the front of the databus section is a bit misleading as to what is on the splice saver. The BCM is showing on the splice saver but it looks like the ABS stuff reports directly to...
  8. Dean E

    Module confusion and issues on my 2008 LMM

    Well here is the latest. I could see the serial buss come back to life when wiggling the wires to the On Star module just below the HVAC controls. I have everything wired in with the breakout harness to capture the event again but so far nothing has failed again. I did have one day the truck...
  9. Dean E

    Trailer Brakes Too Weak

    Comp!etely agree! Those clip on splices are absolute junk, especially on any circuit that can carry a load. Also not weather proof. D
  10. Dean E

    Trailer Brakes Too Weak

    If you are applying full manual brake application to the trailer you should have vehicle voltage to the trailer. Check this first at the connection at the back of your truck and then at the brake wires. That you look at next will depend on what you find there. As for the brake pads do some...
  11. Dean E

    Allison Trans

    Pull your tranny filter and look for metal. If that looks good then likely the TCM, they are known for frying. Not sure I would trust the scanner at the local parts store, what they have can vary greatly in function. Some are just a OBD 2 reader and might need more to read what the tranny is...
  12. Dean E

    Module confusion and issues on my 2008 LMM

    Well I managed to get the splice TS harness in the splice saver. It is a 12 pin comb and noticed I have two pins with no wiring in them. C and K. Per the wiring manual that Ron put out there the pin C is for the OnStar and K is for infotainment stuff that my SLE would not have. I understand...
  13. Dean E

    Module confusion and issues on my 2008 LMM

    Yes that is the pin C I was referring to. I just was not sure on this export module. Saturday I will go out and remove the comb from the splice pack and install the jumper harness. The end of that jumper harness has a connection for a probe lead. I will mark each pin (especially C) so the...
  14. Dean E

    Module confusion and issues on my 2008 LMM

    Well now with my truck cab looking like a science experiment the issue reappeared at lunchtime with a vengence. The GMLAN goes low (zero) when the buss if failing. So either a bad module or wiring grounding out. I still have the lower center dash panel removed and wiggling the wires going to...
  15. Dean E

    2007 Silverado 2500 HD Crank No Start

    Yes, like ^^^^^^^^ he said. This can also cause your auto mode on the climate control to reset to the 74 degrees when the cranking voltage gets too low. Dean
  16. Dean E

    Module confusion and issues on my 2008 LMM

    Looks like I spoke too soon. Took the truck this morning and as I was going down hill to the hwy the truck became possessed again! I turned around and went back home and hooked up a OBD2 pin out box and my new Uscope. By the time I got things connected the trucked cleared out the buss issues...
  17. Dean E

    Module confusion and issues on my 2008 LMM

    Well I wish I could give a good progress report on the GMLAN class 2 buss issue I have been having but nothing has happened since I pulled the 10 amp INFO fuse out. This is the one that powers the OnStar module. I have a OBS2 breakout box and used my new oscilloscope on it and naturally the...
  18. Dean E

    2007 Silverado 2500 HD Crank No Start

    Keep an eye on the seams on the intercooler. Not a big problem on the Duramax but some have been found leaking. D
  19. Dean E

    2007 Silverado 2500 HD Crank No Start

    There are a number of things. GM's thinking on sucking fuel from the tank thru the filter to the CP3 on the stock filter setup does make for a better water separator. When adding a lift pump the stock filter does not separate the water as well. When you do an AirDog or FASS unit the fuel is...
  20. Dean E

    2007 Silverado 2500 HD Crank No Start

    Here is where I connected the power trigger for the relay that operates the lift pump. It is MISC IGNITION (number 40 on the panel). You can see the relay mounted on the side next to the fuse panel. You see two of them on my installation, the second is the optional heater circuit that I...
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