Advertisements The keyfob - it's an aftermarket unit. You know, like how you can buy aftermarket car starters and all that? it's an aftermarket door unlocker (with possible trunk release). They usually are just solenoids or something and this one pulled the trunk release open. Perhaps a stronger spring was mounted so when the release was pulled, the trunk opens automatically - given how if you unlatch the trunk, unless there's electric assistance, the trunk doesn't open. So unlatching the trunk forces it open. The trunk opening turns on the trunk light, which powers the inverter that drives the garage door opener and pulls the trigger. Both of those happen simultaneously and the trigger remains pulled while the system is on.