What is actually going on is the voltage drop across the Hall Effect sensor in the lock cylinder is not consistant. Installing a 2.2kOhm resistor between the BCM 5 volt out and security return will provide a constant voltage drop. 30 minute relearn and you are done. As you can see, I have researched what is going on and have fixed several this way. The one caveat is, if the car in question is an Impala or Monte Carlo, a failing ignition switch can mimic the same problem because one circuit on the switch drops supply voltage to the BCM. I was not ripping on your repair, just telling you how I do it. The resistor trick works on GM trucks, and all cars with the Passlock system.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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