Suspect the High/Low not he seat is a seat warmer. Can't help you with the remote
!
The Hi Low next to the Jake is for choosing the level of Brake Assist you want from the Jake Compression. Low = 3 cyl Assist and High = 6 cyl Assist. As you drive and feel your in a good traffic situation to play, especially on a down hill stretch, play with these Low and High, to get a feel for it. Say you are doing 60 MPH down hill, and activate Jake on Low setting, you should get a downshift to whatever the default gear is in your rig (My 04 with ISL was 4th gear.). This should be felt from both the downshift, as well as the Compression Brake Assist of 3 cyl's. Soon after activating the Low Jake, change it to High, and you should feel a higher level of Brake Assist, when the other 3cyl (Yep total of all 6 cyl's) Compression Brake Assist kicking in... Again if in a safe traffic pattern, as in no one behind you, also experiment downshifting into 3rd gear, to feel the difference between 4th and 2rd (Assuming your's is defaulted to 4th gear too.). After some seat time going down hills, and in traffic, you'll get a feel for what and how you want to use the Jake.
Ongoing best, and enjoy the ongoing fun of shaking out and learning your coach!
Smitty