GMC Troubleshooting Questions? Ask a Mechanic for Answers
the last step # ***** is to try to program the TCCM if you can not to replace it and reprogram it
since this TCCM is new and supposed to be programmed for you can you unplug the TCCM and see with the key ON if the orange wire shows 12 volts at it ? and see if the solid black is a good ground ?
you are correct the dark green/white wire is the communication wire from the TCCM
since you can communicate with the TCCM that wire is good and the power and ground is good
make sure the switch shows 12 volts with the key ON at terminal H and that terminal D is a good ground
if those check out replace the switch if it still does this and sets the U1000 and you CAN communicate with the TCCM the programming is bad or corrupt in the TCCM or the TCCM is defective
since you CAN communicate with the TCCM the TCCM power and ground and communication wire is good
and this would narrow this down to the switch not having the power or ground or a defective TCCM or the programming in the TCCM is wrong or corrupt
there is not anything else to cause this issue and the U1000 code
that is correct
the PCM or the BCM are not any fault at all
it is one of the things i said
can that TCCM be programmed in the truck instead of being pre programmed then plugged in with a programming scan tool and software ?
that is where our problem is
these TCCM's are NOT plug and play
the programming MUST be installed with either of these 2 programming options which requires a desk top or live time software to install the programming into the scan tool then programmed into this TCCM
again that is where the problem is the programming is NOT programmed into the new TCCM
Programming Using Scan Tool Pass-Through Connection
the programming capabilities are purchased either as a monthly fee or a pay as you use
for the solus i would contact Snap-on and see who which they recommend to use with there scan tool
i have just always used the GM programming
all of these TCCM's need the programming installed into them for them to work correctly
used or new the TCCM need to be plugged into the truck then programming installed
but i would contact the local Snap On rep for which programming company's they prefer that will work best with your scan tool
how are you making out ?
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