mine comes on after like 5 mins of driving... i tested it, after the light came on
I was driving late night and my ABS light had came on, so at a stop light i turn my car off and right back on (my ABS light is off) i speed up tp 45 and hit the brakes ABS kicks on, like 3mins later ABS light comes on i hit brakes and my car slides
so who knows, im thinking a wheel sensor