Try replacing the turn signal flasher
Check the fuses on the car, or the signal bulbs.
Check the bulbs. A failed bulb can often cause the signal to stop working on that side.
most likely would be a bad turn signal flasher
If the turn signal is working it's either the brake light switch or the turn signal switch.
you probably need a new turn signal flasher .
My turn signal stop working know my car will not start if the turn signal is up or down
because it is the signal to stop
You probably have a faulty multi-function(turn siganl) switch.
if the front signal is working and the back doesn't, the light is probably blown.
When parts stop working, a diagram can help pinpoint the cause. The diagram for the turn signal lights on this car can be found in its maintenance manual.
Turn signal relay needs to be replaced. If you turn on the hazard (emergency) switch, all the signal lights should come on. This says the lights are okay.