Oldsmobile 2000 Alero side brake lights don't work, center does

check fuses..If the fuse blows the light comes on and the ABS system is not working..Or possible the abs motor is shot. In any rate it is a good idea to look into it as soon as possible. You ABS system is not working. You still have brakes but the anti lock system that prevents skids will not work

Check brake light switch, generally a misadjust could cause this; this device is located on top, back side of the brake pedal.

The fuse if its open is located in the left side of the instrument panel juction fuse box it is a 10 amp fuse listed as Trunk Rel,Rfa,

Looking at a possible master cylinder replacement.

Take the bulb out on the right side and test the terminals in the connector whilst someone else presses on the brakes. If you get 12 volts, then replace your bulb. If you don't get 12 volts, you will have to trace down the problem starting at the bulb. Usually a blown fuse or bad brake switch will cause the entire brake light unit to not function, so I am sure this has to be a wiring issue.

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check the brake switch on the brake pedal

brake light switch under dash on pedal

there might be a problem with your brake system. If there is it wont allow the cruise to work. Hope this helps alittle

Make sure your brake light switch is working,2nd there is a BTSI solenoid (brake transmission shift interlock) that could be bad.

Replace bulbs, one of them is probally bad. Worked on a lot of cars, but my daughter 2001 alero showed me. The car had the same problem, bulbs looked good but one wasn't and that's all it took. Try brand new known to be good bulbs. Ed