Got it working okay now!!
Did some research and seems the transistors I got for the 2N3904's were incorrect. They were PNP and not NPN. So went to Radio Shack and found some "real" 2N3904. Replaced T1 & T2 and now works just like it should on both Volvo and Chrysler.
Only thing is I hacked my PCB trying to unsolder transistors. Had to solder in some wires to make new connections. It's not pretty, but it works! It's inside a box so no one will ever know anyway.....