My “yellow box” is in a crate in the garage. I replaced it with a relay or 2 many years ago. If the seat switch is made the seatbelt switch needed to be made to start the car through the circuitry of the yellow box. The box could be bypassed by pressing the button in the trunk. I think this was for a mechanics remote start. It would make sense on a front engine car. Not so much on ours.
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