Hi SRT6exy,
Okay, that shows the wires between the IC to the PCM and the SKREEM are solid, and the CAN BUS terminations in the PCM and SKREEM are okay. Yes, the CAB connector is located in the engine compartment on the drivers side, forward (towards the front of the car) of the fuse box. There are a bunch of metal hydraulic lines around it. If I remember correctly, the connector has a holding clip/retainer on top that you pull up on to release the connector. The clip doesn't come off, it stays with the connector, so don't pull too hard. It should lift up and stop at some point, then the connector can come off. I don't think the CAB is your problem, but like I said, you can verify that part of the CAN BUS wiring. Since you've been reseating the connectors, have you tried plugging the IC back in, connecting the battery back, and turning the ignition to the ON position or starting the car to see if the black rectangle is still there? It's a long shot, but maybe one of the connectors was loose or had an oxidized contact and now everything works. Next is the SLA - I have a post showing the insides of the SLA if you're curious. Getting the connector out of the SLA is a bit of a challenge without removing the SLA, but it can be done. The connector has a plastic triangular hook on it - I used a thin metal shim to unhook it from the connector housing in the SLA. (I'm probably not strong enough anymore just to brute force the connector out with just my hand.)
-Jerry