Transmission computer location

it's located on the drivers side, front, in the general area above the tire. you should be able to remove a wheelwall cover, like a splashguard, immediately above the front driver side tire (about 12 10mm bolts)

the TCM looks like a small box and has one or two wire harnesses connected before you replace the TCM, take off the wire harness connections and spray some CRC-32 to make sure there is no corrosion (check) as you may not need to replace the TCM

here's a small picture of what the part looks like