C6 Radio no sound

This is the RT3 unit and was made by Magneti Marelli
The RT3 was available in a few different hardware versions, the later ones supporting MP3 playback. These units had an optical connection to the Display Screen.

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IpeXM
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C6 Radio no sound

Post by IpeXM »

Hi,
C6 radio lost its voice. Seems to work fine but no sound at all.
Checked fuses and took radio out to take connectors off and back again.
No help. Any suggestions? :)
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Re: C6 Radio no sound

Post by GiveMeABreak »

Hi and welcome - please post up your VIN so I can determine exact options fitted - as it could be an amp issue (as a lot of these have factory amps or other). I'm consulting electrical diagrams so need specifics I can get from your VIN.
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IpeXM
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Re: C6 Radio no sound

Post by IpeXM »

Ok, here comes.....
VF7**************[VIN obfuscated, can be read by forum staff]
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Re: C6 Radio no sound

Post by GiveMeABreak »

Ok, so you have the RT3 Head unit and the equaliser Amp as I suspected - leave it with me while I check it out...
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Re: C6 Radio no sound

Post by GiveMeABreak »

Ok, so first thing is to check out the fuse to the equaliser amplifier. I would check it with a multimeter and not just a visual check as these can burn out at the edges being hard to see.

It is in the passenger compartment fuse box (BH12) and is a 25 Amp fuse, F32 as per the diagram - should be fourth one up.
C6 Fuse Amp.PNG
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Re: C6 Radio no sound

Post by GiveMeABreak »

Next if you have a Lexia, run a diagnostic check on it. If you are getting an FD3A fault code then that is an internal amp fault causing:
  • Malfunctioning of the audio adjustments
  • No sound
  • Malfunctioning of the adjustment of the sound quality of the equalisation effect
  • Loudspeakers randomly cut out
  • Impossible to put on MUTE
The fault can be with the AMP itself or the electrical wiring.

The system detects any occurrence of an internal error (Memory, processor…) Every 1.5 seconds (for a HARMAN model) or every 200 ms (for the PHILIPS).
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IpeXM
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Re: C6 Radio no sound

Post by IpeXM »

Thanks,
Have to measure fuse first. Last time just took it off to see if broken.
I try ask if I can borrow Lexia from someone :-D

All the functions are just normal except volume knob in radio.
That does not work when you turn it. From steering column push buttons
are working.

Rgds,
Ilppo
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Re: C6 Radio no sound

Post by GiveMeABreak »

So are you saying you have volume control when using the remote buttons?
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Re: C6 Radio no sound

Post by IpeXM »

Yes in that way everything seem to be fine but no any sound.
Just measured that fuse and changed a new one.
Noticed there is no power in that slot (0,5V).
Is there some relay providing power to amp?
IpeXM
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Re: C6 Radio no sound

Post by IpeXM »

Oh.... was wrong about the power. It's ok:)
Had too thick contacts in multimeter.....
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Re: C6 Radio no sound

Post by GiveMeABreak »

I'm just putting together a schematic for you...
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C5 MK II 2.0 HDi Exclusive Obsidian Black
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Re: C6 Radio no sound

Post by GiveMeABreak »

So as you can see, the Amp power is via F32 as per my last post and this in turn is supplied my Maxi Fise 3 (MF3) in the engine fuse box.

But MF3 also supplies power to the Cabin Fusebox supply (BH12) - as we know, the front RH heated seat, the radio amplifier (F32), the Hydraulic Suspension ECU and the AM6 automatic gearbox. So if there was a problem with the supply, it would also affect these other systems.

So if you have no sound via the Head unit volume button and no sound via the audio remote on the steering wheel, then either the amp is faulty or the Head Unit - so you really need to get Lexia on it and do some tests / fault code readings.

8480 is the RT3 Head Unit
8408 is the Equaliser Amplifier

Image
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Marc
IpeXM
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Re: C6 Radio no sound

Post by IpeXM »

Thank you:)
I try to get one used head unit and try first with that one.
Think still need to "code" used one for my car.
-Ilppo-
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C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
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C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
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Re: C6 Radio no sound

Post by GiveMeABreak »

Yes you will need to VIN code the new unit - if you can locate a used one - they are very hard to source nowadays.
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Marc
IpeXM
Posts: 8
Joined: 08 Aug 2019, 18:16
Location: Finland
My Cars: Citroen C6, BMW 520 Xdrive, Renault Avantime

Re: C6 Radio no sound

Post by IpeXM »

Hi
Got a used radio and installed it but still no sound.
Where is that amp located in C6?
Could not find it:)
Ilppo
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