C5 Radio

Krusty

CCCUK Member
AH! I think I've figured it out!!!

So my stereo is a Pioneer Carrozzeria AVIC-ZH9000 and as an extra, you can purchase 4 black wired metal antenna's to help with the Japanese GPS system (pictured below, now discontinued)
Screenshot_20251224_192220_Samsung Internet.jpg

Would we agree these wires look VERY familiar with the plugs in the back of the stereo?
Screenshot_20251224_192325_Samsung Internet.jpg

I know I have windscreen antenna's (but will have to check how many in the morning and hope I see 4) and it would explain why they group together and head behind the dashboard
 

Custom exotics

Well-known user
The 4 black wires are clearly something to do with the aftermarket head unit possibly tv ariels so I would look to remove them the pac lead I wood convert to a euro male iso plug ( as most reasonable aftermarket headunits ie kenwood alpine Sony pioneer etc come with female iso) I have got a wiring guide I can send you of what each of the wires for the pac lead does once converted it will plug straight to headunit won't be able to send wiring diagram till new yr though
 

Krusty

CCCUK Member
I've just gone out and checked, I do have 4 antenna's on the windscreen, each with the same gauge black wiring coming from them. So happy to say that is to do with them πŸ‘ worry over.
Now I can concentrate on the 16 wires that go in to the Pioneer plug.
The new stereo I've bought has 2x 8 wire plugs (male) as shown below
Screenshot_20251224_213831_eBay.jpg

and they fit in to here
Screenshot_20251224_213840_eBay.jpg

If you could send me the wiring guide, that would be a HUGE help β™₯️
 
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teamzr1

Supporting vendor
I meant the radio his C5 has installed as of now, Pioneer Carrozzeria AVIC-ZH9000
which is not a stock GM one
 

Krusty

CCCUK Member
A lot of the labels aren't there.
I'm definitely on to a winner I think... the Carrozzeria wires that are connected to my current unit are as follows:
Main Antenna (disconnected and ready to fit in new stereo).
GPS wire (no longer needed in new stereo).
AV INβ€’OUT (not connected to anything and not needed anyway).
Reverse Camera (never worked and getting a new one with the new stereo).
TV/GPS Window Antenna labelled 1 2 3 4 (no longer needed in new stereo).

That means I only have the main power plug for the stereo left, which consists of 16 wires.
Perfect, because the new stereo has 2x male ISO style plugs, 8 wires per plug = 16 wires πŸ‘
I just need to determine what wires do what from the PAC to the plug (which I'm hoping Custom exotics can provide), solder and shrink them to the new relevant wires.
Then I'll grab the fire extinguisher πŸ˜‚πŸ˜‚πŸ˜‚
 

teamzr1

Supporting vendor
In my post of #21 I included a PDF and a URL showing what each wire of the PAC OEM-1 is for
Does the new radio include what each pin of the unit is for to match up with the PAC wiring pinout ?
 

Krusty

CCCUK Member
The new stereo does have what each wire is allocated to do, so will just be a case of matching the pin out as you say.

If anyone needs any help, I managed to find the OEM-1 PAC function colours. They are as follows:
Screenshot_20251225_162557_Samsung Internet.jpg

I'll keep you updated with my install, and hopefully all of this will help someone else out πŸ™‚
 

Krusty

CCCUK Member
*** SUCCESS ***

Fitted my new stereo today, very simple install thanks to the PAC.
Basically just matching wire functions from the PAC, to the ISO wire functions.

Had a little struggle getting the stereo surround back in place, but its something I can fettle with in the future (its gone dark now).
But again, a very easy install πŸ‘

Sorry again for hijacking this thread. Hopefully it will help others who are looking to change the stereo in the future
 

Krusty

CCCUK Member
Had a little mess around with the stereo this morning to get a better fit.
I've fitted some new metal brackets to hold it in place and decided to sit it flush with the climate control unit.
The centre console fits a lot better now, although you can see a few small bits on the sides where someone in Japan had trimmed it to fit the Pioneer stereo I removed πŸ‘‡

20260110_113054.jpg

I can't complain though. I can listen to music, use my nav and have a reverse camera also.

Job's a good'n πŸ˜ŽπŸ‘
 
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