Under the dash on the drivers side; Turn on the turn signal (if it works) and follow the clicking sound.
Check the answer to "where is the turn signal on a 1996 Pontiac grand prix?" If your looking for the hazard flasher it's mounted closer to the front and it's easier to access.
The turn signal flasher on the 1999 Pontiac Grand Prix is located near the steering column under the lower part of the dash. Look for a silver or black cylinder that is plugged into a receptacle much like that of a household outlet.
Under the dash in front of the drivers' left knee.
Behind the steering wheel right above igontion.
Hazard flasher is clipped underneath the instrument panel just inside the drivers door. Signal flasher is up above the brake pedal
More likely than not the Flasher Relay is defective. Replace it.
Perhaps a bad turn signal flasher or problem inside the sterring column
I am not an expert on the 1990 Grand Prix but on a GM product I would look for a round flasher assembly located near the fusebox downunder on the left side of the dash.
Meadowlands Grand Prix ended in 1991.
Which 1991 Grand Prix? There were 16 Grands Prix in 1991. Ayrton Senna won the most and took the title. Nigel Mansell finished second
no
First check all the bulbs. If all the bulbs are good replace the signal flasher relay. If it still doesn't work it may be in the signal switch. The signals and the 4 way have separate circuits, fuses and flasher relays.