the abs go's through a self check routine every time you turn on the ingnition, check to see if the brake lights are working (daft as it seems if they all fail ((bulbs) then light comes on on dash) if the light go's out but comes on after moving then its a wheel speed sensor, if it come's on and stays on then abs module fault, both ways mean a code read is needed, unless you are handy with a dmm, Regards TB ps there is an over charge system in the abs module (if it detects the alternator is over chargeing then it will stop to much voltage getting to abs unit ) it may have an over charge fault that just needs clearing !!!
Edited by topbloke on 04/05/2009 at 00:20
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