G'day crabcooker, welcome to GPS Power.
I'm guessing you may have a burn problem with that SL disc missing WA and Nth Isl NZ destinations. You could try to re-burn it to SL using another brand disc/different burner/slower speed. Also it seems [Only registered and activated users can see links. ] got a DVD+R SL to work in his Toyota Kluger Grande 2005. That's the first report here of the SL +R working, only -R and +RW for SL and +R DL known to work prior.
Further reporting on your experiments regarding working disc types either SL+ &/or DL- will be welcomed mate.