To be certain, consult a repair manual specific to your 2000 Malibu. A Haynes or Chilton manual will have diagrams showing the location and how to access it. You can also find online resources (some free, some paid) with diagrams and service information.
Simply searching online for "2000 Chevrolet Malibu wiper control module location" may also yield helpful images or forum discussions from other owners who have performed similar repairs. However, always prioritize a reputable repair manual for accurate information.