how do you remove the turn signal assembly on a 1989 Pontiac Bonneville
You have a bad relay. Your blinkers run on a different relay than you hazards do.
Check fuse and/or flasher
you need to change the flasher can for the signal lights
The 1995 Pontiac Bonneville turn signal flasher relay switch can be found beneath the drivers side dashboard. The turn signal flasher relay switch will be above the accelerator pedal.
Look for either a blown fuse or replace flasher unit for the signal lights (it is separate from the hazard lights flasher unit).
it is part of the hazzard light switch on the dash under the raido
bad wiring in your steering column to the hand control?
Check the fuses
The flasher on a 99 Bonneville is located under the dash below the steering column, remove the panel just below the column. It has screws.
The turn signal flasher is combined with the hazzard switch. It is connected to the back of the hazzard switch.
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.