If this is a commercial vehicle it must be checked either every day at the start of the work day or every time a new driver takes over the unit.
If this is a personal car:Ideal: They should be checked every time the car is driven.Really: every time there is a problem suspected or every time the car is serviced. (5000 km or 3000 miles)
You might check to see if your front headlight bulbs are out.
Check your fuses. There should be a black box on the right side of your engine, open it and find the one with rear lights attached to it(the location should be on the top of the box). Pull it out and replace it and your done.
If you are the maker of the check - that is, the person who is writing the check to pay someone else - you should sign on the front of the check and NOT on the back. The back of the check is for the payee's endorsement. The front of the check has a signature line for the maker to sign.
I suggest that you check in back by the trunk and back lights the there may be a short or the wires are lose
dipped headlights (and foglights (a red one at the back and two low slung white lights at the front) if you have them).
check the wiring from front to back
I had the same problem with my 87 Riv. It was a burnt out bulb in the rear of the car. My front signals did work and as they run on different circuits, check and replace the bulbs. Access to the back lights are inside the trunk back.
On an average car, there are high and low beam lights for night driving, clearance lights on the front and back, front and rear turn signals, and back-up lights used when backing up.
Defintely a fuse or a bulb, check them all.
That's a dumb question
Check fuses Check bulbs
Typically, it is a light bulb. Turn that indicator on and check to see if either the front or back light is not working. Some newer cars have turn lights on the front side as well. Compare to the working side to find all the lights that are used. Good luck