CPH (Body computer) wiring diagram Xantia II 2000?

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Egoda
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CPH (Body computer) wiring diagram Xantia II 2000?

Post by Egoda »

Hello everyone, i'm new to this, got a 2000 1.8 16V LFY Xantia non-starter, few issues looking like, trying to sort Central locking first, wondering if anyone has got a copy of the CPH (Body computer) wiring diagram could share. Many thanks.
Last edited by GiveMeABreak on 15 Dec 2018, 11:31, edited 1 time in total.
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GiveMeABreak
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by GiveMeABreak »

Hi and welcome.

Pop up your VIN and I might be able to get you a Diagram.
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by Egoda »

Many thanks for the response, VIN VF7**************[VIN obfuscated, can be read by forum staff]
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GiveMeABreak
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by GiveMeABreak »

Here you go:

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GiveMeABreak
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by GiveMeABreak »

Hardware:
8220: analogue module transponder
8630: protection central unit

Wiring:
8211 : front right exterior low frequency aerial earth
8210 : front left exterior low frequency aerial earth
8212 : rear left exterior low frequency aerial earth
8213 : rear right exterior low frequency aerial earth
8641: Unknown
6245 : diagnostic info
820, 821 & 822: Unknown
B15 : battery +
B25B : battery +
Egoda
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by Egoda »

Thanks a lot, much appreciated. I'm just wondering if any more detailed wiring / internal logic (as to input output) diagram available especially when central locking wires connected to it. trying to figure out workings of the 8 wires goes to central lock in the driver door front and how the inputs and outputs feeds into it from body computer, also deadlock wiring makes it even more complicated i guess. thanks again, any help much appreciated.
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GiveMeABreak
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by GiveMeABreak »

Ok, you have to remember that the circuit diagrams are different depending on the area you are interested in. The CPH is just the basic ECU (precursor to the modern BSI), so you need to be specific to the component that you want to diagnose to get the right diagram. As it's central locking - here is the relevant diagram showing the relationship of this system to the CPH:

There are no 'internal' diagrams of the CPH or oither ECUs - only the connections between them.

If you need component numbers, look them up here using the Wiki, they are split into sections in number hierarchy:

https://frenchcarforum.co.uk/wiki/Elect ... ring_Codes

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Egoda
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by Egoda »

That's great, Thanks a lot. Will have a good look at this and see if i can get the central locking sorted. thanks again for your help. much appreciated.
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by Egoda »

Hi all, is it possible to find numbers / diagram for relays around fuse box in cabin near steering wheel for this VIN VF7**************[VIN obfuscated, can be read by forum staff] Xantia 1.8 16V LFY 2000. Any help much much appreciated. thanks.
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Nick Orfanidis
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by Nick Orfanidis »

Does anyone know where the cable for the unlock command of the central lock is? I've found the lock command cable at the drivers side to the wire loom that is coming from the door... But none of the other cables is the unlock command (-) If it is beneath the glovebox, do you know color and number? Xantia mk2 1998. Thank you in advance!
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by xantia_v6 »

Based on the diagram above, I think that the lock and unlock functions use the same pair of wires, reversing the direction of the locking motors to unlock that doors.
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Nick Orfanidis
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by Nick Orfanidis »

Yes but to do that , the cables that move the motors need a command. As far as I know , there is a command cable for lock (-) which I found, and somewhere is another command cable (again -) that is for the unlock command... The loom that comes from the drivers door has only the lock command.
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Doo
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Re: CPH (Body computer) wiring diagram Xantia II 2000?

Post by Doo »

Nick Orfanidis wrote:
24 Jul 2021, 06:45
Yes but to do that , the cables that move the motors need a command. As far as I know , there is a command cable for lock (-) which I found, and somewhere is another command cable (again -) that is for the unlock command... The loom that comes from the drivers door has only the lock command.
It is likely that the lock/unlock command will travel along one wire, using a diode and resistance to differentiate between signals. It's likje the electronic version of Morse Code.