Your likely culprit is the switch which is located on the top of the transmission. it is a threaded switch/solenoid unit which is an absolute PITA to get to and replace. It's not expensive but the required contortions to reach it relegate this simple problem to a major pita.
Easy temporary fix is to reach into your drivers side fuse box and pull out the fuse out of its plug. I think it is #15 fuse but check to make sure as B7 may be different than B6.
it relays the reverse lights but also your mirror reverse mode ( option that enables your passenger mirror to tilt downward when in reverse.)
that will keep unhappy people behind you from being blinded by the reverse lights.
BTW if it is the rear drivers side fog, then I doubt you would get that much response as that is not that bright in daylight.
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