I can't imagine the interior accessory wiring is very different between the T30 and the T31.
I looked at the wiring schematic for the T30 and the switched (ignition in ACC) radio power comes from before the relay and runs thru Fuse #4 (10A). The switched power for the lighters and the power mirrors comes from the relay and goes thru Fuse 18 (10A) for one lighter, Fuse 23 (15A) for the other lighter and Fuse 20(10A) for the mirrors. If the mirrors work, then I'd think that means the relay is fine.
The unswitched power for the radio comes thru Fuse 32 (15A) in the engine compartment, the unswitched power for the lighter comes thru Fuse 17 (15A) in the engine compartment.
As I mentioned before, my stock radio does not seem to have a fuse in the radio, but my aftermarket radio does, so that's a 3rd possibility for radio power.
Personally, I'd start by pulling and checking the fuses....you don't need to pay a mechanic to do that
Last edited by MikeHJ; Apr 21st, 2017 at 11:55 AM.