I have a '16 IS - Does anybody know the part number for the latest map update?
Thanks!

 

Thanks - PatrixUSA

 

The part number is up to 86271-78013 now.

 

I am being told by my dealer that this must be dealer installed - I can't believe that's true, can some confirm this?

 

The dealer quoted me $275. for the update,but I didn't confirm if that was the price installed. I assume it was since they told me it required a dealer install.

 

Seems like that price is for the art and install.
In Canada the the micro SD card is $230 including tax, so US that's way less than $275.
And no, it doesn't need to be dealer installed.
As mentioned above, with the vehicle off, remove the old card, insert the new card, turn the vehicle on.
It will take a while for the system to upload the data from the card the first time, but after that you are good to go.
Any instructions will be on screen, so just follow them.