Here is what you need for sure:
obd pin #
4- chassis ground
5- signal ground (4 and 5 are the same ground actually)
7- K line
15- L Line
16- unswitched vehicle battery positive (aka, 12V from the battery in
the bus).

My rig only had 15, 7 and 4 as supplied from tiico btw.

hope this helps
Matthew

"Cookson, Noel" wrote:
>
> I checked pin 16 and I had 12v. What pins do you use? I use 4, 7 and 16.
>
> Noel '88 GL tiico
>