Sounds like an electrical problem, check your battery, alternator, and fuse box, and light wiring.
You probably have a bad flasher. This is the thing that actually interrupts the blinker signal, making the lights go on and off. It's location will vary by make and model of vehicle, but is usually under the dash, or in the steering column shroud. You can find out about the flashers in your car by checking in a Haynes or Chilton manual, or by running by a dealership and asking them where it is.
1. End of life on the bulbs 2. Incorrect wattage of the bulb used 3. Fuse problem 4. Wire problem
Faulty relay. Or electrical problem. Lets just hope in your case its the relay. In my girlfriends Toyota corolla the relay was the one inside the drivers compartment just under the fuse box. The local autowreckers had one for $2. In my case it was a little more complicated than this though. I replaced the relay and it was fine for a while, however the same thing happened a week later. A wire burned out from the back of the fuse box and was getting earthed somewhere. I replaced this the entire length of the wiring loom and problem fixed.
I could not be sure about your particular problem, but I had to replace the Multi-Function and Turn signal switches in a 96 Lumina for similar strange problems of Brakes and signals not working in particular scenarios.
More than likely there is a short in your electrical circuit either between the headlights and your switch or in your Headlights fuse. Check under the bonnet near the battery for a fusebox then check for the Headlights or Headlamps fuse then check to see if the fuse has been blown (the fuse will be in a seethrough casing and the circuit will be separated). Another good tool to get for yourself is a simple voltmeter, you should be able to find a voltmeter for about 10 to 30 euros and then read the instructions. When checking for automotive circuits set your voltmeter for DC voltage then place your positive probe on one part of the circuit and your negative probe on another part and note the reading. If the reading fails to read toward normal voltage (12-14VDC) then you have identified the shortcircuit and may be able to replace the shortcircuit or inform your mechanic or dealership or agency of your problem.
I got it. It was the relay switch.
I just had the same problem with my 95 intrepid and it was the sending unit that needed to be replaced.
Check your fuses if it is not your fuses i would say check your hazard switch, mine went bad on my Nissan and caused that problem
i had the same problem...turned out the hazard flashers button on top of steering column was in the wrong position ! ...talk about simplr..hope it works for you
If you have the four way flashers on and the flasher is not working this will cause all four lights to come on. If you are sure the four ways are off then the problem is in the signal light switch in the steering column.
If neither signal light works, the flasher may very likely be the problem. The hazard lights and the signal lights work off different flashers.
You didn't say what type of car you are having trouble with so I'll have to give you a general answer. Some cars use a flasher unit for flashers and a different one for blinkers. others use a module for both. Since it is rare for two flasher units to go out at the same time I suspect you have a module problem. You can usually obtain one at your nearest salvage yard for a lot less money than the parts store or dealer and the guys at a salvage yard are much more likely to answer any questions you may have about how to change it or where it is located.
For safety reasons, you should fix the problem so that you blinkers work correctly. This is a fairly common problem and the cost to repair will likely be minimal. For inspection purposes, however, your blinkers only need to work correctly during the inspection.
Double check the wiring diagrams for your vehicle but it's probable the flashers and signals use the same relay to function. The wiring for your flashers will go through the hazard switch which is where the malfunction is. If you replace the switch your problem should be solved.
Sounds like some kind of electrical problem. Start with checking your fuses. 25PSi
I recently had this problem on my 1997 Corolla and fixed it myself: 1) Lift engine hood. 2) Unscrew the low beam headlight and you will see a bulb connected to the wire/switch. 3) Bring the bulb to your local auto store and buy a new one (normally around $10 or less). 4) screw the bulb back in place. Your headlights should now work.
You may have a relay problem your flashers and turn signal are on different relays or there could be a problem with the wiring in the steering column that goes to the turn signal