OK, here we go. It's a little messy. Start with
Acura Owners Site | Exclusive Knowledge, Service, & Benefits, log in, find your car, next is Owner's Manual & Warranty. This takes you to View All 2015 TLX Owners Manuals & Guides. The manual is under 2015 TLX Owners Manual. Depending on download speed, it'll take a while.
Just had a thought. Isn't the full manual on the DVD that came with the car? Mine is still cello-wrapped and buried in the owner's guide in the glove box.
there, that's how I found the manual. Hope this helps.