Turn on the hazard switch (emergency blinkers). You should hear it under the dashboard on the drivers side. The emergency blinker and turn signal are each controlled by a different relay but the relays look alike. Once you've located the emergency blinker relay, the turn signal relay is nearby.
check your fuses first, then check your bulbs and then your relay.
Either the flasher or the turn signal switch is bad.
replace cam position sensor
you will have to take that into a dealer and have them make the repairs
dimmer switch is on the turn signal lever, to replace you need to remove steering wheel
under the dash
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
Pull off panel under steering wheel. You will see two separate flashers. Replace the one on the right.
If memory serves, there isn't one. All that switching is done at the turn signal/low highbeam/cruise control stalk.
There is no relay. The flasher in under the dash on the left of the steering column
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.
under dash drivers side mounted above the brake pedal
Low beam bulb burnt out? Replace bulb. Bulbs OK? If the dimmer switch is also the turn signal/cruise/headlight on and off switch, you probably have to replace the entire switch.
pictures of how to change front signal bulbs on a 2004 grand prix pontiac
This question has come up several times. The answer seems to be to remove the housing around the steering column and look underneath. There are two flashers. Replace the one on the right. but don't quote me, OK? I stole this answer from one of the other posters