98_k1500
strange noises are normal
Yes, it saves the re-learned resistor indefinitely until its programmed to another one, just like when they program it the first time at the factory. Only have to do 1 re-learn.
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I would like to point out that GMT400 trucks (aside from the escalades/denalis in 99-00) do not have a Body Control Module. They just have a ECM.