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 - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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