1998 Accord A/C Issue

I have a 1998 Honda Accord EX 4dr 4cyl with manual climate control.
For the past couple of months, the A/C lights would flicker on and
off. When the lights would go off, the fan would still be blowing out
air, but it had stopped cooling. I took the radio & A/C face off the
dash and made sure the wiring harnesses were in place. I unseated and
reseated both harnesses (one to the fan, the other to power & temp)
several times. I also examined the wiring to see if I could tell if
any of the wires were loose or exposed and nothing appeared out of the
ordinary.

I could tell that when I unseated the right wiring harness (the one
that controls the power and temp) that all the lights went off and the
cooling stopped just as before. This led me to believe the problem is
in the wiring harness itself, and not the relays in the A/C head unit.

Now, its stopped flickering and will not work at all. Only the fan.
No lights, not temp adjust.

Just in case anyone asks, I did check for leaks under the hood and
made sure I had coolant. Everything there is ok. The head unit is
not telling the compressor to come on. And its not just the A/C relay
button on the head unit that goes off, its all the buttons. None of
them work.

Do I need to replace the wiring harness, or could the prob actually be
in the A/C head unit? What else can I look for?