If the 2000 ML has the same layout of the ABS system as the 1998 ML then then some of the wiring passes behind the driver's side headlight. The ABS pump motor is part of the assembly you can see under the hood with all of the metal brake lines coming from it.
Hope this helps.
Ken

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2014 E250 Bluetec 4-Matic
2014 GL350 Bluetec 4-Matic
1996 Chevy Tahoe 4 x 4
2009 ML350 (sold)
2005 SLK350 (sold)
1999 E300 Turbodiesel (sold)
1998 ML320 (sold)
1991 300D 2.5 Turbodiesel (sold)