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Sun Jan 26 2020, 10:15pm
Joined: Jan 26 2020
Member No: #4236
Location: Cardiff
Hello. Hope nobody minds me asking a question in this thread from 2010 but I have a question regarding the Citroen C6 instrumentation.

I am currently looking to buy my first Citroen C6 and I am tempted by Lignage trim. Some appear to have the the sat-nav RD4/MP3 screen others have a smaller screen set into a central recess.

Do all C6 trim levels have the head up display?

Can the RD4/MP3 screen and functionality be retrofitted to cars with the smaller screen?

Any help or advice greatly appreciated.
Mon Jan 27 2020, 12:00pm
Joined: Nov 26 2010
Member No: #299
Location: Wiltshire
From memory:

Exclusive always had the 'big screen' with Sat Nav - earliest systems with the mapping on a DVD, and a CD changer in the boot; later units with hard disk and no CD changer.

Lignage had small screen as standard, but a good proportion of them had sat nav as an optional upgrade (so have the 'big screen'). I would think it would be possible to upgrade, but it may be a complex and expensive job. Also, the sat nav has never been great, although I like the way the HUD shows the directions for you.

Exclusive and Lignage both have head-up display (HUD).

Base models had small screen and, I think, no HUD.
However, to my knowledge only a couple of base models made it to the UK, so you are very unlikely to find one (I've never seen one).
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 ckracer76 (27 January 2020)
David Hallworth   
Mon Jan 27 2020, 01:27pm

Joined: Apr 16 2010
Member No: #90
Location: Glasgow
RT3 isn't really worth Retrofitting in my opinion.

If you're going to retrofit then I'd be looking for an RT4 or an RT5. RT5 has the benefit of having bluetooth built into it. I'm not sure if the microphone for the internal phone system is fitted in a Lignage though.

RT3 uses a different screen to RT4/5, RT4 and 5 share the same screen.

RT3 reads it's navigation maps from a CD whereas 4 and 5 use a HDD built into the headunit. They also have the ability to upload music onto the internal HDD using the Jukebox feature.

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 ckracer76 (27 January 2020)
Mon Jan 27 2020, 06:51pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
Before spending money on it remember that even if you upgrade to RT5 the maps for the navigation system were last produced quarter 3/4 2015.

If your not going to lots of 'new to you' places is it worth the effort and money?

Me personally, I don't mind having a TomTom stuck on the screen which has up to date mapping and guidance when I'm going out of familiar areas, (down into France or to Italy the past couple of year).

The only advantage for me having RT4 over an RT3 is having the ability to load music onto the 'jukebox' which I have done using home compiled MP3 discs but even then I don't play them much.

BTW my current 6 (4th) is Lignage spec with Navidrive and Black leather upgrades so all that's really missing v an exclusive is Lane Departure (which I turned off as a nuisance) and electric steering column adjustment (which can be 'sticky') and mine never needs 'adjusting' anyway
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 FraserG (27 January 2020) , ckracer76 (27 January 2020)
Tue Jan 28 2020, 12:22am
Joined: Jan 26 2020
Member No: #4236
Location: Cardiff
Thank you for the replies. Much appreciated.

Wow. Looking at people signature spaces I'm a litle bit in awe of some of the Citroen cars you all have or have had. Incredible combined knowledge.

I like the look of the factory audio head units but as you all say the technology and features are quite old and the sat-nav maps outdated in 2020.

I have spent the last few days trying to find (without success) somebody who has swapped out the Citroen RT3/RT4/RT5 audio head unit and fitted a modern 1-DIN size single radio replacement or 2-DIN size aftermarket screen alternative?

It appears that the standard Citroen audio head units are made by Magnetti Marelli, Italy (which I really wasn't expecting) but some people also seem to think they are made by Blaupunkt, Germany. All the RT3 and RT4 units I have seen for sale secondhand are marked Magnetti Marelli.

I found a link to a Citroen C6 case study that has had a professional audio upgrade installation and even they did not replace the standard head unit?

Case study link: - Click Here -

I am wondering what the issue is with replacement? Is it a lack of facia plates to allow fitment in the non-standard aperture or something else?

Thanks in advance.
Tue Jan 28 2020, 09:33am

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
When I was running the C4owners - Click Here - forums a few members upgraded from RT3/4 to alternatives.

Can't remember what exactly but a search on there might find something however things like the parking sensors etc. run via the head unit and from what I remember some 'interface' units were required but it's been a while now so I can't remember. 'Wozza' (Tom) who is now head admin was the one doing most of the changes to his car so that will help narrow down the search for you.
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 ckracer76 (28 January 2020)
David Hallworth   
Tue Jan 28 2020, 01:24pm

Joined: Apr 16 2010
Member No: #90
Location: Glasgow
One of the issues is there is more then just the radio and nav that run through the screen in the car.

The trip computer including temperature gauges, climate control, telephone, and probably something else I've forgotten all run through the central screen and are controlled by the RT3/4/5. Infact, if you remove the headunit from a UK spec C6, I believe the speedo defaults to kilometers.

Removing that and replacing it with something aftermarket would cause multiple issues with controlling all of the cars functions as I don't think they'd be controllable or function correctly without it operating.

Tue Jan 28 2020, 11:33pm
Joined: Apr 09 2017
Member No: #3097
Location: Bournemouth
Hi Christian,

Changing the head unit for a DIN aftermarket is not a good idea for all the reasons Dave and Dave have outlined.

What is the reason for the swap? If it is for audio there are options if you already have an RT.

Using the Nav: I actually use the standard satnav quite a lot, even though it is quirky and out of date. Most of the time, especially in rural France it is perfect! I combine the built in with Google Maps on a mobile phone. A lot of roads don't change - and if I am off somewhere new I do check for any variance between Google and the C6.

For sound, on RT4, I use both the HDD and the Aux input in the glove box. The CD import is slow though..... The input from the Aux is not a true line in so I use a small in line amplifier (Fiio i1), although a bluetooth version would work if you wanted. You need a cable to hook up the aux phono sockets to a 3.5mm headphone plug (easily available from Amazon).

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 cruiserphil (04 February 2020)
Wed Jan 29 2020, 10:44am
Joined: Jul 17 2012
Member No: #954
Location: Bergen
In Norway the Government killed FM radio (!), so we need DAB+. I tried to find an alternative with DAB and found one listed for Peugeot 407, but the dealer said it could not be used on the C6. My garage tells me to try RT6 from Magneti Marelli. But I will not experiment and will only try something others have succeeded in doing.
Mon Feb 03 2020, 02:43pm
Joined: Sep 09 2011
Member No: #615
Location: Groesbeek
The RT4 and RT5 system in a C6 contains the configuration for like lights and so on, so changing to a different system will let you loose some of the configurations of your car.
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 cruiserphil (04 February 2020)
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