Check the bulbs Check the flasher
If neither signal light works, the flasher may very likely be the problem. The hazard lights and the signal lights work off different flashers.
It needs checked out but both the hazard and brake lights go through the turn signal switch.
Bad bulbs? Sockets corroded?
the turn signal flasher may be the problem moast vehickles have one forturn &one for 4way
you should try checking the fuses and replacing the bulbs the fuses for thos lights should only be about a 10 or a 15
Change the turn signal flasher relay.
One of the bulbs is burnt out.
Try the fixes offered in the "Related Question" below... Chances are really good they'll work for you.
Try replacing the turn signal flasher
Could be the bulbs or the fuses or the flashers or the signal switch assembly
If you mean that the arrow inside the dash turns on and stays on then your problem is one of the left side turn signal bulbs. Test by turning on your four way (hazard) lights and observing all lights. The one that does not flash is the bulb that needs replacing.