bmw318iscoupe

HI all new to the site and im after some help!! ive got a 99 e36 318is, the abs and asc light used to be on permanently and was picked up on scanner as a abs pump. i fitted a 2nd hand pump, now the abs light has gone out but the asc light is still on. i had it put back on the scanner again and nothing abs or asc related came up, could anyone help me? ive been reading up on this some people have said could be a sensor or even the asc dash switch thanks :)