Probably not going to be helpful here because I don’t remember the details but I have the Atoto F7 and had to buy some additional quad lock connectors and the aerial connection converter. In the end it was plug-n-plug-n-plug-n-play.
Also I don’t have amp or steering controls.

Not an audio guy but with enough searching and a couple of incorrectly ordered connectors I got it working without having to do any manual wiring.

Something like this:

Amazon.co.uk

 

It looks like you have a T5.1 this harness should do the trick, if you read the instructions on the Atoto it tells you how to reprogramme the buttons to work for the steering controls, the amp outputs are via the harness anyway, it may be worth telling them you have a caravelle before you order

404 Not Found - SCR DISTRIBUTION, HIGH QUALITY CAR AUDIO PRODUCTS

SCR DISTRIBUTION, DISTRIBUTOR OF HIGH QUALITY CAR AUDIO PRODUCTS

www.scrdistribution.co.uk

 

Thanks. This actually looks like it has the correct connections in the quad lock for powering the unit.
But, it's funny that a T5.1 harness is more suitable as my van is from 2005 pre-facelift so a regular T5 multivan highline.

I've seen that the reprogramming of the buttons is quite easy for Atoto (also one of the sales pitch that got me into the purchase)
I'll try and contact the SCR and see what they reccomend.
Thank you for the help

 

Atoto support answer. They are recommending a few options from Connect2.

1. Connects2 - Vehicle Integration
From these options, the CT20VW08 has the fakra to antenna connection but I'm not sure if the car amp will be powered and connected and I assume that no steering wheel controls will work with this.


2. Connects2 - Vehicle Integration
This one doesn't have quadlock connector but has a CAN BUS

Also, I found this one
3. Connects2 - Vehicle Integration
From the picture, I don't see the right connections in the quadlock adapter that fit my wires so I'm not sure, also there is the amp question again.

 

Ask the folks who make the quadlok adapter, the audio system just plugs in and works , the adapter is what actually sends the signal

 

That's strange your buttons look rounded on the switches which is an upgrade that the 5.1 got perhaps the caravelle always had this! I would still talk to the folks who make the harness before plugging anything in

 

That's because the OP has got the European Multivan, not the same dash as the UK T5 Caravelle of the same age.
Not sure why VW only produced that for the European market as it's a much nicer dash than the UK T5's got!

 

im afraid none of those facias, harnesses will work. You need a mk1 Touareg facia, then you have another issue. There are no speaker wires in the harness , only power, ground, CanBus wires and amp input wires

A mk5 golf harness should do your power and audio controls on the steering wheel, used in conjunction with the correct patch lead

then you just need to work out the speaker wiring , hopefully the amp isn’t digitally switched on

 

A reply from the Atoto support:

As for your issue you are not sure how to connect to the amplifier as you don't have any speaker wires on the dash.
Do you mean you want to connect your car original factory amplifier to S8G2104PR ?

Actually ATOTO car radio S8G2104PR has got the amplifier built in its system , and you only need to connect the 8 speaker wires of your car to the 8 speaker wires on ATOTO car radio power harness ,then you can get the ATOTO built in amplifier to work properly.

But if you want to use an aftermarket/factory original amplifier,you need to connect the 4 RCA ports from the external amplifier to the 4 RCA port（ FL,FR，RL,RR ）on the back of car radio .

So basically according to them, I'd need to somehow connect the amp with the radio (I knew that)

So a few question for you.
According to the old RNS2 radio pinout there is an output L, output R, and output GND (marked yellow on the picture). Is that used to send an audio signal for the amp or am I thinking wrong?
If yes, can I use those wires to somehow connect to the new radio (speaker outputs, RCA...) to send a signal towards the amp?
Also, the Atoto harnes has a wire labeled amp to power up the amp.

Answer from Peter (SCR DISTREIBUTION)
It will require a complete rewire from the new radio to the amplifier outputs and you will need some crossovers or a 12 channel amplifier.

Well F**ck 🤯
I'm not sure what he meant with crossover (what is that) or a 12 ch amp as I already have an 12 ch amp as I said to him in the e-mail.

 

ok lets do it logically, your old amp must have outputs and inputs why can you not trace them back to source?
the old head unit HAS to have an output to the amp be it analogue or digital it wont work off magic, once you fidure out what you have already then we can suggest solutions instead of guessing

 

There's usually a solid blue 'remote' wire which is used as the trigger signal from the back of the headunit to switch on an external amp (often labelled/used for powered aerials). Any audio signal will be output from either the RCA outputs on the back of your new headunit or via the speaker outputs of the quadlock/ISO connectors.
The preferable option is to use the RCA outputs as these signals aren't processed by your head unit - and it's sent direct to the amp to take care of.

 

Hello everyone, its old discusion but, did you found solition?

 

Hi...
I bypassed my integrated amplifier and connected the speakers directly to the headunit.

 

o, thx.