Either the switch that turns the backup lights on is out of adjustment, or has failed in the on position.
for the tail lights all the other lights are working blanking lights brake lights and reverse lights but no tail lights on both side
Check the fuses first then check the bulbs.
1 reverse light and 1 tail light
This usually means a bad or wrong bulb in the tail lights
The white parts of the tail lights are the reverse lights.
In the back should be tail lights which always come on when the headlights or parking lights are on, and stoplights which come on whenever the brakes are pressed. The stoplights should be brighter than the tail lights, but they should be separate.
On the back of a car there are tail lights, turn signals, and brake lights. Cars also have back up lights that tell people when the car is in reverse.
Remove tire and inner fender well and change it from there. Other option is to remove the licence plate and reverse lights,reach through to the tail lights.
bulb number for taillights are 2057 on a 1991 civic dx.
1977 Chevy pickup brake lights not wordking but turn, tail,reverse allworks
In those tail lights there is a circuit board. If it goes bad it will cause all kinds of problems.
Begin I removing the tail light connector. Take hold of the tail light, push in and turn at the same time. The tail light will come on. Reverse the process to install your new tail light.