Well, if none of them work, (front or back) I'd suspect a fuse or the flasher. Do the 4 way emergency lights work? If so, they operate on a separate flasher and this would indicate
that the turn signal flasher is bad.
under the dash
Pulling the turn signal switch toward you should switch the lights to the low beams. If that doesn't work, you may have to replace the switch, which means replacing the entire turn signal stalk.
you need to change the flasher can for the signal lights
There is no relay. The flasher in under the dash on the left of the steering column
WHAT ARE THE WIRE COLORS FOR BRAKE AND TURN SIGNALS ON 1999 PONTIAC IN ORDER TO HOOK UP TRAIER HITCH PLUG?Not positive yeLL0w wire Left turn signal, riGht Green wire once you have the turn signal wiring hooked up the brake lights will automatically work because the brake lights work through the turn signal wiring, brown running lights, white ground.
under dash drivers side mounted above the brake pedal
Check the fuses
When the signal lights are not working on a car, there are a couple of things that could be going on. One could be that the bulb needs to be replaced. The other possibility is that the signal relay needs to be replaced.
Remove the panel under steering wheel. There will be 2 flashers. Replace one on right.
check your fuses first, then check your bulbs and then your relay.
take the wheel well out first then reach in and turn bulb socket
Check the left turn signal bulb. It is probably burnt out.