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INT-SL+ will not finish programming. The led does not turn off during programming (2002 GMC Sonoma)

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I am trying to program INT-SL+ on 2002 GMC Sonoma however, when I get to Step 8, I start the vehicle as instructed but the LED never turn off. Just keeps flashing. I have tried several things - using the most recent firmware, old firmware. I tried Data-link, hard wired, I have double checked that the wiring is correct. Any advise on what I can do? Service number 002102086504
asked Jul 26, 2020 in GMC by ERIC (400 points)

1 Answer

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The firmware you are on now (3.06) or firmware 0.53 will work for this truck, as long as the vehicle has no immo/starting issues to begin with.


Verify voltage is present at the 14 pin connector on the pink wire with the key on and that it goes to 0 with key off.


J-1850 voltage should vary depending on how busy the network is, again should be checked at the int-sl to make sure its reaching the module.


Lastly power and ground.


I know some of these old trucks get radios swapped out in them and they do not terminate the network properly, which can impede module programming.
answered Jul 27, 2020 by derek ! (284,550 points)