i was told by mercedes mechanic that when the battery is disconnected you have to reset the abs light. he told me you have to turn the steering wheel all the way one way and all ther way the other way. dont remember if you had to it more than once. it didnt fix mine because i had other issues 1) clock spring needed to be replaced and the crank sensor( i think) needed to be replaced. have a 97sl and it had been in a wreck