We've been skirting the issue for a while but no one has ever satisfied the question on the differences between wiring harnesses in the various trim levels, Base, SE and HSE.

Fo example in the Base and SE trim levels, HK sound is optional where in the HSE it is standard, however to get nav or reversing camera you need HK sound as a minimum.

So if someone has a Base level or SE with HK sound, is the wiring harness different from the Base, SE or HSE trim level with nav or reversing camera? Is the coaxial cables present for the roofmount GPS even if there is no nav in the car?

Has anyone actually taken the dash or headlining off to check whats there or not?