Fuse box located under dash drivers side .Fuse *5 15 amp Fuse
Check the fuses.
Front seating area, center, under dash, mounted on center dash brace.
GLove box
There are two audio fuses located behind a panel on the left of the pedals on the driver's side
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on the driver's left side
You have to remove the glove box. Once you remove it the turn signal relay is located above the fuses up under the dash. (There is no way to get to it or see it - other than removing the glove box) I just replaced mine ~
open the dash and feel to the left it is in there
fuses are in the drivers side kick panel....relays are located under the hood
The switch is located on the driverside just past the fuses towards the break pedal.
The 1990 Chevy Lumina signal flasher unit can be found beneath the drivers side dashboard. The signal flasher unit will be above the brake pedal.
Try turn signal flasher usually around the fuse box