Originally Posted by
x.Gen
better/quicker option with the LM - pull the TX/RX lines at the LM terminal, fab up leads to the FTDI from there - works the same as at the SCI. only problem is whether you have extra leads you can use for the LM (if I remember I got mine from a radio harness when I went yard scavenging several years back); otherwise you can just tap the TX/RX lines at the terminal. mounting options from there are up to you, but you can make it much more accessible that way (like anywhere in the console, arm rest, or glovebox). you should be able to do that much quicker than finding the pins on the chip.
I did this (pulled the lines to SCI at the LM, and replaced) with the FTDI cable with the embedded module, but you get the idea...same concept.