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Since I used a 1996 Lincoln Town Car system, I had to get compatible key fobs.
My plan on the trunk function, Bulldog makes a remote starter system that can be activated with a ground signal. Use a relay to reverse the positive pulse from the module so it will activate the starter system. The panic button, I will have to see what the module output does when it is activated, positive or negative and whether it is steady state or pulsing. On the Lincoln the signal goes to the lighting control module.