So if you are going to install these resistors, you have to measure the resistance of the key so you know the amount of resistance the BCM is looking for.
Then you don't need to put them in the BCM, you can put them anywhere in line between the ignition key cylinder and the BCM.
Take a look at the wiring diagram and you will see two wires going to and from the resistor pellet.
You need to put the resistors in the reference wire (purple/white) wire so that the 5 volt signal is decreased to the proper voltage that the BCM is looking for. This will eliminate the need for the key to have the proper resistance.
So start with measuring the resistance of the key and then find a resistor or a combination of resistors to match that resistance. Then just cut the wire and solder in the resistor in the wire.
Most people will install this by the ignition switch because that is the easiest place to access. Does that make sense? If you just prefer to put it by the BCM, that is fine as well. I attached the process from the manual.
Images (Click to enlarge)
Sunday, September 27th, 2020 AT 9:09 AM