Renault Clio UCH repair and replacement width new versions

**mexanico1971** · 13th May, 2017, 01:39 AM

I People
I dont know if exist any thread about UCH repair and replacement
Old versions like Sagem BG or N?1 are not available any more
S? any one knows any source to buy it ?
wicth version is use now for replace old ones

About repair , i see that major problems are solders in PCB parts , not in connectors

Newbies , wend you want any pass , send PM to the guy , don"t span the thread

**albertros** · 13th May, 2017, 01:30 PM

Hi,
BG can be replaced with N2, HG replaced with N3.
N3 will replace N2.
N1 seems to only like N1
Not complete list but a start.

**mexanico1971** · 15th May, 2017, 02:02 AM

Thank"s for your input
So if BG can be replace width N?2 why does N?2 have delay after turn key off ?
I mean I switch off the key, and take it out of the ignition, and engine only 4 seconds later shot off ?
Any idea ?
I coded UCH width Clip

Thank"s in advance
Brs

**guerraa** · 24th November, 2017, 12:49 AM

Hi, after UCH replace do a ECM reprograming and all will be ok, dont know why but worked all times for me.

Best regards

**Dunker** · 26th November, 2017, 01:08 AM

Solder all caps etc. under black 40 pin connector. Solves 99% of UCH faults.

Also, for your own reference, from a good UCH measure all components to PCB GND under the connector and write all values down. Will give you an idea if a component or something connected to it is not right. Will save you hassle of removing connector more than once.

**Louislesinge** · 30th November, 2017, 10:19 PM

Hi,
What I can tell you is I've change about 50 UCHs in my life, most of them with original parts, and a lot with used parts.
You can allaways change Nx for a same grade or higher (N1 instead of BG, N2 instead of N1 etc).
Another speciall thing is if you got a Clio with engine 1,9 DTI, it needs to be the same UCH because of the antitheft. No other UCHs works for antitheft instead of the original: it happens to me twice ( red light stays on without flashing, it means no comunication UCH=>ECU) and I did not find another solution than removing antitheft from ECU 0 281 010 788 .
I've tested virgin, copying, all desperate things you can do.
I think this kind of ECUs have a special protocol.
Regards,

**Louislesinge** · 31st January, 2018, 01:45 PM

Hi,
By the way I order an UCH to replace BG P8200065817 G1 V4.1 , the replacement from Renault was 82 00 621 763 written N3 instead of BG.
Regards,

**Louislesinge** · 3rd February, 2018, 09:16 PM

Hi,
For the same UCH BG P8200065817 G1 V4.1 pulled up from recycle.
Antitheft light blinking permantly, does not reconise or even see any key i tryed (tested reset and another antena etc).
Tested continuity beetwen pin8 Black connector 40 ways and SAGEM E34707A OK (near the same connector upper right side, no contact to earth.
Tryed to replace the chip SAGEM E34707A from another working UCH: Now works fine, can learn the keys again, car starts.

If some needs electric diagram:
IMG_20180203_210759.jpg
Regards,

**tomo776** · 20th February, 2018, 12:49 AM

Hi.
I found something and repair this uch without them come back to me.
It take me a lot of nerves to find this but I wanna to find what can be done and after that solution I repair more then 10 uch and cars work more then 3 years without problems.
If someone need this ask on pm for password.
I use picture from 1 post of mexanico1971 .
And my picture high res. to see how it`s look after repair.
Soldering is not my best work but in late nihgt hour when I work this can pass.

Regards

**Louislesinge** · 20th February, 2018, 12:07 PM

Hi tomo,
I'm interested in your investigations, please send PW.
Regards,

**Louislesinge** · 20th February, 2018, 09:16 PM

Hi,
Ok tomo, i'll try to follow the electronic circuit to understand.
You don't say which problem this change solves: antitheft light staying on or flashing, etc. Those are for me the biggest problems because many times they are sporadic. The last one i save changing SAGEM E34707A, was permanently inoperative, a kind of breakdown easy to fix.
Regards,

**tomo776** · 20th February, 2018, 10:08 PM

Problems is
Car does not start,electric window problem, lights dont work etc.
Car going crazy and sometimes when you pull wiring of uch car work ok but this fix this errors.
First is sporadic that car does not start and problem with electric in car but then fail to start after some time.

This fix if car start doing this with no reason.
If someone change batery and reverse polarity mix + and - this is not fix for this.
And if some part inside uch is burn for some reason.

**nagyfeco82** · 21st March, 2018, 02:13 PM

hi
Why i cant download tomo776 post attached links

**ecuelettronica** · 8th June, 2018, 01:24 PM

non apre il rar file dannegiato

**cemar** · 9th August, 2018, 10:19 PM

Originally Posted by tomo776

Hi.
I found something and repair this uch without them come back to me.
It take me a lot of nerves to find this but I wanna to find what can be done and after that solution I repair more then 10 uch and cars work more then 3 years without problems.
If someone need this ask on pm for password.
I use picture from 1 post of mexanico1971 .
And my picture high res. to see how it`s look after repair.
Soldering is not my best work but in late nihgt hour when I work this can pass.

Regards

Password please, tank