C4 VTS - Adding front parking sensors

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lancia58
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C4 VTS - Adding front parking sensors

Post by lancia58 »

Hi

My 2006 2.0 16v C4 VTS has rear parking sensor. I want to add front parking sensor. IIRC I read in a forum that in C4 VTS the harness for front parking sensors is installed and only the sensors should be installed as well as configuring the BSI . How can I know if the harness in installed ?

Zohar
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GiveMeABreak
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Re: C4 VTS - Adding front parking sensors

Post by GiveMeABreak »

For this C4 model, there were several parking ECUs depending on build date, but unlike the C5, the one you currently have for rear only would seem to be configurable for front and rear parking options and would not appear to require another ECU.

Obviously you will need the relevant sensor supports and trim in addition to the sensors.

It would also seem that you already have the supplementary front harness in place according to your VIN to answer your question.

See the second diagram for the harness which is item (1). The second harness (2) is for AFIL only.
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lancia58
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Re: C4 VTS - Adding front parking sensors

Post by lancia58 »

What is Citroen part number for the front harness ?

Zohar
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Re: C4 VTS - Adding front parking sensors

Post by GiveMeABreak »

Harness number (1) has a part number of 6568 86. This is the harness that should be fitted to your car already.
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Re: C4 VTS - Adding front parking sensors

Post by lancia58 »

I checked online at Citroen service it my car includes that harness
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Re: C4 VTS - Adding front parking sensors

Post by GiveMeABreak »

So once you have the parts you just need to reconfigure the Parking Assistance ECU for Front and Rear. You may also need to configure the Head Unit ECU also to account for the change. I'll check later.
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Re: C4 VTS - Adding front parking sensors

Post by lancia58 »

Can the Harness (6568 86 ) be seen through the grill of the front bumper , I looked for it through the front bumper gill and didn't find it

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Re: C4 VTS - Adding front parking sensors

Post by GiveMeABreak »

I doubt it, the harness is probably tucked up behind the bumper - and as you don't already have the front obstacle detector sensors fitted, there won't be any reason for the wiring to be dropped down at each sensor point - so the sensor wiring drop down wires may be clipped / tied to the main loom. A bit of investigation work will be involved.
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Re: C4 VTS - Adding front parking sensors

Post by bloodjean »

Hello,

This weekend I tried to install the front parking sensors on my C4.
I already have the rear parking sensors.
Both Parking Assistance ECU and Head Unit ECU are compatible because I could program it with the front and rear mode.

So I decided to install the front parking sensor and to connect it to the connector pre-installed under the hood.
It occurred that I've got an error with the front parking sensor. I then realise with a scheme that the harness isn't connected to the Parking Assistance ECU. I discovered some wires not connected near this area (not sure it could be for front parking sensor) but there is no continuity with the harness under the hood. So I don't understand, could it be possible that the harness is partially installed ? From the hood to the back Parking Assistance ECU is there an other connector ?
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Re: C4 VTS - Adding front parking sensors

Post by GiveMeABreak »

Pop your VIN up and I’ll check the harnesses.
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Re: C4 VTS - Adding front parking sensors

Post by bloodjean »

VF7**************[VIN obfuscated, can be read by forum staff]
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Re: C4 VTS - Adding front parking sensors

Post by GiveMeABreak »

Your build date 10789
ECU part numbers 6590 N5 (to be Configured) or N6 (Pre-configured) are what you have and I have confirmed that these also support front parking assistance too, so that is ok.

Your issue is going to be the lack of wiring harness from the front sensors to the rear Parking assistance ECU. Think about it - if the front sensor harness is already there on models without it (pre-wired) and the ECU is compatible, - then there would already be front and rear assistance on all vehicles with rear parking!

So you probably have a different intermediate harness which carries the wiring to the rear ECU and that is why they are not functional.
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Re: C4 VTS - Adding front parking sensors

Post by bloodjean »

So what should I do ?
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Re: C4 VTS - Adding front parking sensors

Post by GiveMeABreak »

There are loads of harnesses - Engine, Supplementary, Front, Fascia, Intermediate, Seat Belts, Rear, Tailgate and others - so I can't tell you which one of these you need unfortunately. It would be a hell of a job to change the harness now - that's why they do a repair kit as they are not easy to replace once the car is assembled with all the trim in place.

Just to make it harder, the harnesses are fifferent for left and right hand drive models and again on 3 / 5 door models and again on the build date.

If I had the VIN from a C4 of the same model, engine and year with the Front & Rear factory fitted Parking Assistance system already fitted - I would at least be able to compare the harness part numbers and see which ones are different.....
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Re: C4 VTS - Adding front parking sensors

Post by xantia_v6 »

There should I think be a wiring harness diagram which gives details of which harness each circuit connects through (on a car with the option fitted), this would at least tell you which harnesses and connector blocks to inspect.