If we're talking about the OBD, it doesn't connect to anything under normal circumstances. It's used to connect a scan tool to read the engine trouble codes.
See the message thread on this web site labled "High Idle Speed"
That thread is discussing a different topic but it has a diagram and a picture of the OBD connector from a 1995 Buick Century. It looks the same as mine. It's mounted under the dash, under the steering column.
Saturday, November 12th, 2011 AT 7:28 PM