C5 X7 RT4 - Fitting Factory Amplifier

[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!

[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:

Element	Designation
BB00	Battery
BH12	Passenger Compartment 12-Fuse Box
BPCB	Protection Unit: Battery Cable (Dt17 Engine)
BSI1	Built-In Systems Interface
CA00	Ignition Switch
CV00	Switching Module Under The Steering Wheel
PSF1	Connection Board - Fuse Box (Engine Compartment)
VMF1	Steering Wheel With Fixed Central Controls
0004	Instrument Panel
6570	Airbag ECU
7215	Multifunction Screen
7800	Stability Control Ecu (Esp)
8404	Aerial GSM, FM1
8406	Aerial FM2
8415	CD Changer
8424	Audio Amplifier
8426	Bass Acoustic Speaker Enclosure
8430	Rear Left Loudspeaker
8435	Right Hand Rear Speaker
8440	Front LH Tweeter Speaker
8444	Front Woofer Speaker (Left Hand )
8445	Front Right Tweeter
8449	Front Woofer Speaker (Right Hand )
8480	RT4 Audio/Telephone
8482	Car-Phone Microphone
8486	External Audio Input Block
8501	GPS Aerial

No. of link	Signal	Transmitter/receiver	Nature of signal
1	Radio control status (volume, frequency search, etc) Controls at the steering wheel status Trip computer control Navigation control	VMF1 / CV00	LIN
2	Radio control status (volume, frequency search, etc) Controls at the steering wheel status Trip computer control Navigation control	CV00 / BSI1	Body CAN
3	Vehicle speed information	7800 / BSI1	CAN Is
4	Impact information	6570 / BSI1	Body CAN
5	Impact information	6570 / 8480	filament
6	Radio reception signal FM2	8406 / 8480	Analogue
7	Audio signal : Playing of CDs	8415 / 8480	Analogue
8	CD changer control (mode, tracks...)	8480 / 8415	COMFORT CAN
8	CD changer status	8415 / 8480	COMFORT CAN
9	Radio reception signal FM1 GSM signal	8404 / 8480	Analogue
10	GPS signal	8501 / 8480	Analogue
11	Display data	8480 / 7215	Analogue
12	User voice	8482 / 8480	Analogue
13	Auxiliary audio/video input signal	8486 / 8480	Analogue
14	Impact information Vehicle speed information VIN code information	BSI1 / 8480	COMFORT CAN
14	Emergency call sequence information Display request processing signal	8480 / BSI1	COMFORT CAN
15	Navigation information	BSI1 / 0004	COMFORT CAN
16	Radio pre-amplifier output signal	8480 / 8424	Analogue
17	Output signal to the woofer speaker (Left hand front)	8424 / 8444	Analogue
18	Output signal to the front left woofer speaker for emergency call in the event of an accident	8480 / 8444	Analogue
19	Output signal to the tweeter speaker (Left hand front)	8424 / 8440	Analogue
20	Output signal to the speaker (RH rear)	8424 / 8435	Analogue
21	Output signal to the speaker (Left hand rear)	8424 / 8430	Analogue
22	Output signal to the speaker (Bass acoustic speaker enclosure)	8424 / 8426	Analogue
23	Output signal to the woofer speaker (Right hand front)	8424 / 8449	Analogue
24	Output signal to the tweeter speaker (Right hand front)	8424 / 8445	Analogue
25	Vehicle speed information Network life phase information	BSI1 / 8424	COMFORT CAN
25	Status of the audio amplifier Audio amplifier fault	8424 / BSI1	COMFORT CAN

[GiveMeABreak]

So here are the pin outs for the Audio Amp as they relate to the RT4 in the C5 X7:

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'
Channel number Allocation of channels of connector 1 Channel not connected 2 CAN + 3 Channel not connected 4 Audio amplifier front right output positive control 5 Audio amplifier front right output negative control 6 Channel not connected 7 COMFORT CAN High 8 Channel not connected 9 Central power switch positive 10 Channel not connected 11 Audio amplifier front left output negative control 12 Audio amplifier front left output positive control 13 Channel not connected 14 COMFORT CAN Low 15 Channel not connected 16 Earth	Channel number Allocation of channels of connector 1 Positive control of the front left tweeter 2 Positive control of the front left woofer 3 Channel not connected 4 Rear left boomer and tweeter positive control 5 Channel not connected 6 Positive control of the rear left bass acoustic enclosure 7 Channel not connected 8 Channel not connected 9 Negative control of the front left tweeter 10 Negative control of the front left woofer 11 Channel not connected 12 Rear left boomer and tweeter negative control 13 Channel not connected 14 Negative control of the rear left bass acoustic enclosure 15 Channel not connected 16 Channel not connected

Connector 'C'

Channel number Allocation of channels of connector 1 Positive control of the front right tweeter 2 Positive control of the front right woofer 3 Channel not connected 4 Rear right boomer and tweeter positive control 5 Channel not connected 6 Positive control of the rear right bass acoustic enclosure 7 Channel not connected 8 Channel not connected 9 Negative control of the front right tweeter 10 Negative control of the front right woofer 11 Channel not connected 12 Rear right boomer and tweeter negative control 13 Channel not connected 14 Negative control of the rear right bass acoustic enclosure 15 Channel not connected 16 Channel not connected

[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]

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!

[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]

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!

[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....

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]

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?

[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.

[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?

[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]

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...

[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

[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?