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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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