Where is the 1995 Buick Riviera diagnostic port?

For most GM vehicles the diagnostic port is left of the steering column, just under the dashboard.

It is on the pasinger side of counscel down by feet. There is a little planel on side of counscel that pops open, revealing it. It is in plain view.

That's a cigar lighter. It's about 8 inches under the dash, left sde of steering column. Black panel cover has tab that opens toward you