Perhaps I didn't explain my complex question well. Let me try again by describing a use-case: Let's pretend I remote start my car and then, for whatever reason, someone breaks the window and uses a screwdriver to physically turn the key cylinder (thus unlocking the steering wheel). In the case of OEM remote start systems there will not be an RF chip within the requisite ~20cm of the car's sensor, and any one of the OEM protections will kick in (usually either the engine dies when one steps on the brake or when the transmission is shifted out of park). My goal is to have the same behavior. Basically, "the RF key is designed to prevent someone without a programmed chip from stealing your car" and with bypass modules *one of those chips is hidden in your car already* . I don't want that.
Right. That is what is going to happen.
When you remote start, the bypass module tricks the ignition into thinking the chip is near it for a split second. Just enough to start the engine. The bypass module is now dead again, it does not continue to send the RF signal to the ignition. So in order to drive away, you need to put the key in the ignition, turn it to "run" and off you go. The bypass does not constantly transfer the RF signal to the ignition.
The bypass module is tucked up way under the dash. No one is going to get it, unless they have plenty of time and know exactly where you installed it. With the cheaper systems, there is a key inside that module. It is not taped to the ignition switch. So I guess theft is a possibility...unless you jacked up the key portion or just stuck a loose chip inside the box.
Higher end systems don't keep a key in the bypass module, they just duplicate that RF signal when its called for. So absolutely no way for them to get to this signal and steal your truck. If they are capable of that...then your screwed either way.
Bypass module is just the generic name for the system that allows remote start on anti-theft systems. It can hold a key or learn the RF signal. I think some companies call them different names.
Hope that helps some.