C5 X7 RT4 - Fitting Factory Amplifier

This unit is the RT4 and RT5 system and is made by Magneti Marelli
Main differences between RT4 & RT5 - RT5 has Bluetooth Hands Free, faster Navigation calculation and on C4 & C4 Picasso only, USB ports and a High-Res screen.

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Fortius
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C5 X7 RT4 - Fitting Factory Amplifier

Post by Fortius »

Hi everyone! I've recently bought this HIFI system for my car. I have 4 woofer, 4 tweeters and the amplifier. I don't have the subwoofer. From the above diagram I've (almost) managed to understand which wire is which... However, I have the following questions:

1. Where do I connect CAN+, CAN High and VAN low?
2. Where do i connect the rear left and right tweeter?
3. Why does the amplifier have a left and right output for the bass module (subwoofer i guess).
4. From where can I get signal for the signal inputs of the amplifier (RH audio system input and LH audio system input - 16way black connector). The RT3ev/RT4 does not have line output, as far as i know!
5. Are there any other diagrams, schematics or anything else that I can use?

Any help is highly appreciated! Have a great week!
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GiveMeABreak
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by GiveMeABreak »

Here is the circuit diagram and a list of all the connections. I will shortly put up the pin out connections specifically for the Amp as it relates to the RT4 - the table in the other thread is similar, but better to have the correct one.

I assume you have an RT4 fitted from your post. That being the case here is the electrical diagram for the Audio Amp to RT4:
RT4 Amp A.PNG
ElementDesignation
BB00Battery
BH12Passenger Compartment 12-Fuse Box
BPCBProtection Unit: Battery Cable (Dt17 Engine)
BSI1Built-In Systems Interface
CA00Ignition Switch
CV00Switching Module Under The Steering Wheel
PSF1Connection Board - Fuse Box (Engine Compartment)
VMF1Steering Wheel With Fixed Central Controls
0004Instrument Panel
6570Airbag ECU
7215Multifunction Screen
7800Stability Control Ecu (Esp)
8404Aerial GSM, FM1
8406Aerial FM2
8415CD Changer
8424Audio Amplifier
8426Bass Acoustic Speaker Enclosure
8430Rear Left Loudspeaker
8435Right Hand Rear Speaker
8440Front LH Tweeter Speaker
8444Front Woofer Speaker (Left Hand )
8445Front Right Tweeter
8449Front Woofer Speaker (Right Hand )
8480RT4 Audio/Telephone
8482Car-Phone Microphone
8486External Audio Input Block
8501GPS Aerial
No. of linkSignalTransmitter/receiverNature of signal
1Radio control status (volume, frequency search, etc)
Controls at the steering wheel status
Trip computer control
Navigation control
VMF1 / CV00LIN
2Radio control status (volume, frequency search, etc)
Controls at the steering wheel status
Trip computer control
Navigation control
CV00 / BSI1Body CAN
3Vehicle speed information7800 / BSI1CAN Is
4Impact information6570 / BSI1Body CAN
5Impact information6570 / 8480filament
6Radio reception signal FM28406 / 8480Analogue
7Audio signal : Playing of CDs8415 / 8480Analogue
8CD changer control (mode, tracks...)8480 / 8415COMFORT CAN
8CD changer status8415 / 8480COMFORT CAN
9Radio reception signal FM1
GSM signal
8404 / 8480Analogue
10GPS signal8501 / 8480Analogue
11Display data8480 / 7215Analogue
12User voice8482 / 8480Analogue
13Auxiliary audio/video input signal8486 / 8480Analogue
14Impact information
Vehicle speed information
VIN code information
BSI1 / 8480COMFORT CAN
14Emergency call sequence information
Display request processing signal
8480 / BSI1COMFORT CAN
15Navigation informationBSI1 / 0004COMFORT CAN
16Radio pre-amplifier output signal8480 / 8424Analogue
17Output signal to the woofer speaker (Left hand front)8424 / 8444Analogue
18Output signal to the front left woofer speaker for emergency call in the event of an accident8480 / 8444Analogue
19Output signal to the tweeter speaker (Left hand front)8424 / 8440Analogue
20Output signal to the speaker (RH rear)8424 / 8435Analogue
21Output signal to the speaker (Left hand rear)8424 / 8430Analogue
22Output signal to the speaker (Bass acoustic speaker enclosure)8424 / 8426Analogue
23Output signal to the woofer speaker (Right hand front)8424 / 8449Analogue
24Output signal to the tweeter speaker (Right hand front)8424 / 8445Analogue
25Vehicle speed information
Network life phase information
BSI1 / 8424COMFORT CAN
25Status of the audio amplifier
Audio amplifier fault
8424 / BSI1COMFORT CAN
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GiveMeABreak
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by GiveMeABreak »

So here are the pin outs for the Audio Amp as they relate to the RT4 in the C5 X7:
RT4 Amp Pin Out D.PNG
Connectors
(1) Audio amplifier.
"a" 16-way black connector.
"b" 16-way white connector.
"c" 16-way blue connector .

Role
The audio amplifier amplifies the 4 audio outputs of the audio system/audio-navigation and divides them into 8 amplified outputs:
2 outputs for the front woofers
2 outputs for the front tweeters
2 outputs for the rear tweeters and woofers connected in parallel
2 outputs for the bass acoustic enclosure

Electrical Features

The connection to the audio amplifier is by means of 3 connectors (The 3 connectors are of the SICMA 16-way type):
  • The black connector transmits the low power information and the supplies
  • The blue connector transmits the power information to the right-hand speakers
  • The white connector transmits the power information to the left-hand speakers
Connector 'a'Connector 'b'
RT4 Amp Pin Out A.PNG
RT4 Amp Pin Out B.PNG
Channel numberAllocation of channels of connector
1Channel not connected
2CAN +
3Channel not connected
4Audio amplifier front right output positive control
5Audio amplifier front right output negative control
6Channel not connected
7COMFORT CAN High
8Channel not connected
9Central power switch positive
10Channel not connected
11Audio amplifier front left output negative control
12Audio amplifier front left output positive control
13Channel not connected
14COMFORT CAN Low
15Channel not connected
16Earth
Channel numberAllocation of channels of connector
1Positive control of the front left tweeter
2Positive control of the front left woofer
3Channel not connected
4Rear left boomer and tweeter positive control
5Channel not connected
6Positive control of the rear left bass acoustic enclosure
7Channel not connected
8Channel not connected
9Negative control of the front left tweeter
10Negative control of the front left woofer
11Channel not connected
12Rear left boomer and tweeter negative control
13Channel not connected
14Negative control of the rear left bass acoustic enclosure
15Channel not connected
16Channel not connected
Connector 'C'
RT4 Amp Pin Out C.PNG
Channel numberAllocation of channels of connector
1Positive control of the front right tweeter
2Positive control of the front right woofer
3Channel not connected
4Rear right boomer and tweeter positive control
5Channel not connected
6Positive control of the rear right bass acoustic enclosure
7Channel not connected
8Channel not connected
9Negative control of the front right tweeter
10Negative control of the front right woofer
11Channel not connected
12Rear right boomer and tweeter negative control
13Channel not connected
14Negative control of the rear right bass acoustic enclosure
15Channel not connected
16Channel not connected
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EDC5
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by EDC5 »

You are a brave man to attempt the factory amp installation.

Bear in mind yo uwill need some time on Diagbox to change the amplifier mode on the RT4 once installed (or possibly before).
Fortius
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by Fortius »

EDC5 wrote:
24 Feb 2020, 23:00
You are a brave man to attempt the factory amp installation.

Bear in mind yo uwill need some time on Diagbox to change the amplifier mode on the RT4 once installed (or possibly before).
Could you elaborate about the Diagbox? After all the connections are made, the amplifier will not work as such? I don't have Lexia or Diagbox, and I don't know how to change mode on the RT4.

Note, my HU is RT3ev (I understand that it is identical to RT4).

Thank you!
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GiveMeABreak
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by GiveMeABreak »

Several things to bear in mind:

As EDC5 says, you will need to change the Amplifier setting in the BSI to tell it you have an Equaliser Amp. Only do this when you have completed the project.

'Presence of an audio Equaliser Amplifier' - change to present

The actual Intermediate wiring harnesses for vehicles with an Equaliser Amp option were different - as the speaker connections are different for this setup. As you can see from the 'role' section in my last post, some of the outputs for the rear tweeters and woofers are connected in parallel.

A lot of those harnesses are no longer available from Citroen. So have a think about this before going ahead.
Fortius
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by Fortius »

Regarding the harnesses problem, I will do the appropiate connections to the actual harnesses from my car. As long as I know which cable goes where, that is not a problem. Do you think there will be any problems after I connect to the CAN BUS?

Marc, thanks for the input, but on the new pin out that you posted, I don't see any amplifier inputs from the head unit. On connector "a", pins 4&5 and 11&12 are assigned as output; is there a typo?

If I understood correctly, I have to connect the speaker outputs (front left and right) from the RT4 head unit to the inputs of the amplifier (left and right). After using Lexia or Diagbox and 'Presence of an audio Equaliser Amplifier' is changed to "present" as you said, I suppose that the head unit will change the type of the signal output in a way that the amplifier can process. Is that correct?

Again I want to mention that my head unit is not RT4, is RT3eV. I have attached 2 pictures with the HU.

Thank you all for your involvement so far!
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GiveMeABreak
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by GiveMeABreak »

That is the official RT4 unit as fitted at factory, despite the label on the back - that is what PSA refer to it as.

No Typos - like I said there was a different vehicle intermediate harness for models fitted with the equaliser amp - you won't have those connections on your exiting harness:

There are actually 16 different Intermediate harnesses for the various options and head units fitted for the X7 Estate alone....
RT4 Harness.PNG
That's why it will probably mean you having to manually create all the wiring needed and that is something I can't help you with personally. It's not something I would of attempted myself as I know these things are notoriously difficult to retro-fit.
Fortius
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by Fortius »

Is there any way to identify the type of harness installed in my car?
I'm thinking that if I know the part number maybe there is a schematic with it and using that I can cut/solder wires to retrofit the amplifier.
But, the primary problem remains from where do I get the signal from the head unit and where do I plug that signal into the amplifier?
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by GiveMeABreak »

There are CAN network connections from the Amp to the BSI shown in the diagram (Black connector, pins 7 & 14) and again a different CAN connection from the BSI to the RT4. It's a multiplexed Amp - so it's not just a matter of cutting and splicing - if you do that on the CAN network, you may have operational problems with the car as the data network transmits other data to other unrelated ECUs on the Comfort network.

So what I am saying is that because you don't have the correct electrical loom installed that would have the connections to the amp (which would then have the CAN wiring to the BSI) there's nothing to wire in.

But here is an electrical diagram for the X7 with Equaliser Amp fitted so you can see the wiring:

See my earlier post for the equipment otems in the tables (8424 is the Amp) - and all those wiring connections are missing on your car.

Image
Fortius
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by Fortius »

OK, thank you for the info. So I guess that in the end, there is no way to install this amp on my car using the actual harnesses, is there?
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GiveMeABreak
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by GiveMeABreak »

Put it this way - it would probably be easier to get an aftermarket amplifier that will work with what you do have I suspect.
Fortius
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by Fortius »

I like a challenge, but I don't want to have different problems in the future.. If only I knew that before I bought the system...

I do have another question though: I've tested the 4 door speakers (woofers) on my system and they work fine, but each tweeter from this setup (Philips HIFI System tweeters) is heard very dim (you can almost not hear them at all). At first I thought that the first tweeter had a problem, then the second, and the third and the fourth. I thought that they don't work proper because the signal is not coming from the amplifier, hence the need and desire to install the factory amp...

I can not find any technical information about the speakers and the tweeters. No power output, ohms and so on...
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GiveMeABreak
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by GiveMeABreak »

There are a different set of speakers for systems with the Hi-Fi option and the wiring that goes to them from the amp is specific, so they won't get powered properly from a normal system without the amp or the amp wiring to the speakers.

That's why is's such a job and often requires re-wiring all the speakers and tearing the car up to do it :-D
Fortius
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Re: C5 X7 RT4 - Fitting Factory Amplifier

Post by Fortius »

I will tear up the car and put it back together, as long as i find what goes where! :))
So far I understand that it's very hard to do this retro fit, but not impossible... I still have some questions... don't know if I'll find the answers.

Anyway, no one has done this until now? No other crazy person like me?
Last edited by Fortius on 25 Feb 2020, 17:11, edited 1 time in total.