Help with Car Audio System Wiring

[Bongo-Bean]

Hi,

New Bongo owner here.

I know this topic has been brought up many times before, but I have searched the forum and can't seem to find the answer to my specific problem.

I have recently purchased a Bongo (2006 model) and the previous Japanese owner had fitted a Pioneer Carrozzeria AVIC-MRZ66 GPS/audio system which I want to replace. I have pulled out the unit from the dashboard to have a peek at the wiring behind (please see attachments below.

I want to replace it with another audio unit, probably something more simple (not really bothered about GPS).
I have read on a few post I probably need a wiring harness. Not sure which one I need though. Looking at my existing wiring do I need to change or modify anything else?

Any help will be greatly appreciated.

Thank you.

[g8dhe]

You need to follow the wiring back to the original Mazda connector which has the vehicle wiring loom behind it, normally the original loom is covered in a foam wrap behind the plug. Then you will need the relevant Mazda to ISO conversion wiring - its possible that is what you already have, or at least a homemade version of it.
There are two types of adaptor depending on year;
from 1995 to around 2000/2001 it is PC2-10-4,
after 2000/2001 it becomes a PC2-78-4

both types are available on ebay,
https://www.ebay.co.uk/sch/i.html?_nkw=+PC2-10-4
https://www.ebay.co.uk/sch/i.html?_nkw=+PC2-78-4

[Bongo-Bean]

Thank you for your reply Geoff.

I will investigate further.