Rodent
Member Since: 02 Nov 2013
Location: Aberdeenshire
Posts: 64
  
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| Epb wiring - nsr wheel arch to epb switch |
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I have the dreaded epb fault (red and orange fault lights) and my iid tool shows u2002. I’ve checked the wiring and found that the yellow wire running from the switch to the nsr wheel arch connector shows infinity (broken wire??). The wiring from the epb module to the nsr connector is ok, (continuity) and the connector itself is ok. The other 3 wires (red, yellow/green and yellow/blue) all ok.
I’ve also bought a new epb switch from LR, just to rule that out.
Does anyone know the routing of this yellow wire, eg where it goes after the rear nearside wheel arch block connector, to get to the epb switch by the drivers seat?
Thanks, Will
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 30th Sep 2023 11:23 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10735
 
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I think the next step is to get into the front wheel arch , passenger side.
There is a connector at the bottom of that.
A thick wire powers the epb there.
Look at the connectors there and check condition and continuity
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| 30th Sep 2023 11:40 am |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18573
 
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Most likely is that the yellow wire from the body into the arch connector C0376 is broken or very badly corroded close to the connector.
My yellow wire and another (can’t remember the colour off the top of my head) were dust 
I cut the wires to get back to known good copper, extended them and bypassed the arch connector pair completely - joining the extension onto the EPB side.
The only other connector pair is C0903/C0867 which is they grey set of 24 pin connectors under the centre console.
https://disco3.co.uk/gallery/albums/userpi...g_diag.pdf 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know!
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| 30th Sep 2023 11:40 am |
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Rodent
Member Since: 02 Nov 2013
Location: Aberdeenshire
Posts: 64
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Thanks Pete and Martin,
I’ve recently had the body off to do turbo, timing belts etc so I did inspect the nsf 3 big wiring plugs, and all looked well (have had a problem there before). I checked the nsf wires all the way back through the compressor and all looked ok.
When I had the body off, I unwrapped the wiring all the way from the black coloured block connector to the rubber boot (where it goes up into the body, somewhere near the storage cubby hole in the boot nearside.) the wiring all looked intact, no damage or signs of corrosion. I used electrical grease on all the connectors I’ve disturbed too.
I’ve also had the centre console apart and checked from the epb switch to the grey 24 pin connector, and that was good too.
So ultimately I think the fault lies between the 24 pin grey block and the nsr wheel arch ? I just don’t know where this wire routes.
It may not be relevant, but my rear park sensors have also completely stopped working (having been only partially working for years, they now don’t work at all)
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| 30th Sep 2023 12:02 pm |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18573
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Before you look into the main cable run, check again at the rear wheelarch connectors for the yellow wire having broken/corroded. 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know!
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| 30th Sep 2023 12:46 pm |
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