Seems pretty hacky to me. (And trying to add a trailer bulb into the circuit that is driving the normal taillight bulb will almost surely trip new errors)


FRM is on the Left drivers side (USA), by your knee against the side. IIRC.


Google Footwell module....you will find a TON of info.


You have an FRM problem, IMO. With ISTA you should be able to query the module, I think. And others offer a service to repair FRMs.