Start with the obvious. Burned out bulbs. Replace them. this eliminate the bulbs. Save the old bulbs so that if it turns out to be something else then you will have a spare.
The daytime running lights work of the high beam, check those first.
To repair the Reatta running lights check the fuse first. If the fuse is blown ad a replacement blows then check the lights and wiring for any shorts.
If the headlight that runs through the modulator first is out then the daytime running lights won't work. Change the bulb and the daytime lights should then work.
The first thing I'd do is check the fuse. If the fuse is good the you might have a short in a wire somewhere.
First you have locate the knob or the dial controls. This is what brightens the lights on your dashboard. Then you need to check the fuse that controls the dashboard lights. Most of the time the fuse needs a simple replacement.
1991 cavaliers did not come with the option of daytime running lights they first appeared in 1995 as standard on 1996 models.
you have to have your normal lights running first, then press the switch above the main cruse control button on the dash left of the steering wheel.
saturn
1st move the light switch to the desired position. 2nd PULL the switch gentle towards you. There are two positions for this switch. The first position or click, will turn on your front running lights. The second position or click will turn on both your front running lights and additional lights in the rear. You will be able to tell that you have activated them by the icons on your dash that will inform you they are on. To turn off simply push the switch back in. (Actually, those are the FOG lights, front and rear.)
the first moon discovered on Saturn is Aegaeon
That is a safety feature,but to the left of steering wheel the first button you can turn to off to turn them off,but if you do that,you won't have day time running lights
Remove the trunk liner and they're easy to get to. However... Contact your local Saturn dealership first. The taillight assemblies have been recalled and if YOURS hasn't been replaced yet you MIGHT be entitled to new lights.