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Could be an Instrument cluster failure. It's a common problem in 1990 Rivieras. I suggest you take it to an auto mechanic that specializes in electronics.
open hood look for the light assembley powercords that go into the headlamp..turn right or left to loosen ... you may have to just take a screw driver and remove the cover over the signal light. press in and turn and replace.
I believe you can replace by laying UNDER the fender and reaching up . The bulb will twist to unlock. Replace the bulb and repeat proceedure. NOTE!!! you may need to remove some of your plastic splashguards to access it!!
Check the ECM part number. If it is a 1228253 that is your problem. get a 16198264 the other number does just what your car is doing. I worked at a Buick dealer and know about the problematic 1228253 ecm.
check the switch you maybe have accidently turned it on so the light will stay on. You can also check the bullet switches on the front door posts, they could be stuck, if so spray them with some penetrating oil.
The fuse block is located under the center of the dash. On the left front
side of the console. I believe you're looking for fuse #2 20amp.
Hope this helps.
Look on the dash. I believe it's on the passenger side over the glove compartment.
It's easy enought to test. Turn lights to automatic and cover it up. It's time delayed to prevent the
lights from coming on if driving under a bridge.
The light sensor is in the dash board top about 2/3rds of the way over toward the passenger side. You will see 3 or 4 small slits, and that is where it picks up the light, or absense of light. Is the twilight control switch, located under the main light switch, in the position to turn the lights on automatically? It is a slide type switch, and must be slid over to the right for the automatic control to work.
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