When you install an aftermarket stereo there's 3 plugs in the original radio. Is there a special adaptor available to allow for ISO connection. There's Bose rear amplified speakers in the rear



Is this the type you need ?

 

Yes, I believe that's the one. I think it's type 70-1787, correct?

What's I have heard from doing a little bit of research on this, is that the wiring may be backwards on the adapter for the Bose stock stereo, so it would be a good idea to do a little searching on this forum to look for the DIY and any "gotchas".

 

There's also this lead PC9-408 which comes up for the installation guide as well



although there is still plugs missing for power and speakers in that type

 

Sorry I am jumping in about 2 months later, but I am just now coming across this thread and saw that this is exactly what I need for my after market upgrade.
Where exactly can I find this harness and will this enable me to turn on the radio without the key in the ignition like the factory radio?
Any guidance on the matter would be greatly appreciated.

 

I got the harness off ebay after being told by a radio installer i would be looking at a cost of £80 for him to fit. Ebay harness was £11 and took me all of half an hour to install. Radio comes on without the ignition key.