I can't find any reference to an automatic transmission for this model. All my diagrams are for a manual transmission. The second pair of wires on the brake light switch is for the cruise control. It shows a dark green / red and a pink wire for that function.
The brake light part of the circuit uses an orange wire for the 12 volt feed, and a brown wire. I think where I would start, since you already found a melted wire, is to unplug the brake light switch, then use a stretched-out paper clip to connect the brown and orange wires together in the connector. Doing that should turn on the brake lights, even with the ignition switch off. Check if that function works. Also check if that makes any front bulbs turn on.
If everything looks right so far, turn the ignition switch on, then see if the signal lights work properly. If they do not, remove the "Backup Lamp" fuse, number 5, a ten-amp, then see what happens. That feeds the pink wire to the brake light switch. If things change with that fuse removed, that pink wire would have to be melted to the point of touching one of the brake switch wires.
The even better suspect is still a bad ground in the rear. Remove the paper clip from the brake light switch, and leave that switch unplugged. Now see what the signals do. The rear signals and the brake lights are different bulbs and are not related to each other, ... Except that the left brake light bulb and all the tail lights share a common ground point.
Actually, I'm going to have to stop here until you update on what you find this far. The wiring diagram is real confusing. According to it, you do not have a right tail lamp or left or right brake lights! I'm guessing that is not true. Also, tell me exactly how many bulbs you have in one rear lamp assembly, and if you can figure out if the stop lamp filament is the same one that's used for the signal. The diagram shows them as two totally different bulbs, but I'm not sure if that's right.
Sunday, July 16th, 2017 AT 10:50 PM