If all of them are out you probably blew a fuse. There are multiple fuse boxes located in the vehicle. Check your manual to see whuch one has the taillight fuses. When you find it go through the row of fuses and try to locate a blown. Also demate and remate any associated relays. This will givw you a fresh contact surface electrical bond incase one might be corroded.
you have a blown fuse, look in your owners manual and it will show you the fuses location.
Bulb warning failure relay, a big round and red relay, back the ashtray
there is a tee conector at the rear of the vehicle that may be have corrotion take it apart and clean it
Bulbs may be blown.
They Do
Check your fuses.
They dont
I am having the same trouble. My brake lights work with the light switch for nighttime driving, but only far right brake light works when i pres brake pedal. Reverse lights dont work at all. Turn signals and hazard light work.
Back up lights does not work on my 90 modle 240 gl
bulbs blown on high side or wiring shorted
the bulb has 2 filaments. One may not be working. Try replacing the bulbs. Or, there is a bare section on the wires that lead to the bulb.
Simple-wring problem, or you just need to replace the bulbs.