To my knowledge, MTS is not a US option at all on any year or on any trim level.I purchased a 2017 GX 460 Luxury model and just discovered that it does not have MTS on vehicle. Can someone recommend a mechanic in Los Angeles who can add this feature? I assume dealer can not complete this upgrade. Also, what is the correct part number for this upgrade/replacement? I learned not to base part on VIN for my vehicle.
As far as adding it, just order the part 859A1-60040 for your 2017. DO NOT use your VIN when ordering, it has been reported that they may send the wrong part then. The part itself is literally plug n play. Turn the car off, unplug the old part, add the new part, start the car and MTS is there.
Note
The part is behind the dash and takes a bit of disassembly. However, I was able to complete it in about an hour....that was including disassembly, removing the old part, installing the new part, and reassembly. Attached is the guide I used to take the dash apart.