Sorry didnt know what year you had. On my 79 the wiper switch is on the dash, and the module is mounted under the dash ,the connecter and harness isnt long enough to reach the firewall. My module is black and it has two screws holding the cover on it. The connector that plugs into the switch on mine, has ten wires, six of them go to the module and the other four go to a connector that plugs into the wiring harness under the dash. It also has a part number on the module. Ill post the number on it and look at my wiring diagram when I get home from work, and find out what color the wires on the module are. No bother, just trying to help you out.