In my '92 GSR, while cruising at freeway speed (70+), my abs warning light comes on and stays on until I turn the car off and back on, but when I turn the car back on it goes away until I take the freeway again. I checked for codes from that led on the abs control unit next to the rear passenger seat but found none. Any ideas would be much appreciated, Thanks!

 

Maybe its when you use your brakes for a while?

 

no, cruising=not much stopping

 

Oh my bad. Sorry, hope someone here helps you. Good luck.

 

check your brake fluid sometimes the light will come on just bc it is low

 

You can take the cover off and read the code on the ABS ECU.
I don't know what your problem could be but, the reason the light goes off when you shut off the car, but then comes on again is because the system resets it self. But the problem is chronic not acute, so the light comes back on when the cicumatances that caused it to go in the first place, are the same.
HTH