where is the Anti-Lock Brake Control Module at

I think everything is located out at the brake master cylinder itself, computer actuators ect........ Before randomly replacing parts I would use a scan tool to retrieve fault codes stored which is causing the ABS light to come on in the first place. If you do need a wiring diagram of an overview and testing procedures there is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subrcription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try http://www.eautorepair.net/Marketing/Default.asp?VID=125669 and get an online repair manual subscription.