ABS lamp

After my ommis is finally broken (after fixing a loose cable at a mass point at the throttle flap) I have a new problem. The ABS indicator light is always on. All cables are on, the “gears front and rear are cleaned with the wire brush after the SCheiben change. But the light stays on. Does this thing have any relay or something you can change, or do I have to invest a lot of money for a new ECU? Can mi r someone help??? Thank you in advance. Greeting Ralf