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Rodent
Member Since: 03 Nov 2013
Location: Aberdeenshire
Posts: 64
  
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I’ve got a fault in the epb wiring on my disco 3. There are four wires that run from the nsr wheel arch to the park brake switch. One wire (yellow) has infinite resistance between the rear wheel arch connector and the switch by the drivers seat. I tried changing the switch.
Having read extensively on the forum, my understanding is that the wires run forward from the wheelarch and then go under the passenger seat?
Seat removal looks job looks ok, but will this reveal the wiring or will i need to lift the carpets too? (And has anyone done this. I’ve got an mot coming soon and its a certain failure without the epb working 😭
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 24th Oct 2023 1:21 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10530
 
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How about probing the wire inside on the passenger sill ( if that’s where it is) and that will tell you which side the break is. (It’s problem outside really?)
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| 24th Oct 2023 1:26 pm |
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Rodent
Member Since: 03 Nov 2013
Location: Aberdeenshire
Posts: 64
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Hi Pete, i’m trying to find the routing of the wire to then pick it up half way. I read somewhere that once the passenger seat is out, the wiring might be accessible underneath. Just not sure how to get the carpet lifted, or maybe just the plastic sill covers by the passenger door would be enough. Was hoping someone who had done this might be able to advise how to attack it…otherwise with my ham-fisted approach I’m likely to break things🙄
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| 24th Oct 2023 1:49 pm |
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nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4187
  
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Plastic sill just pops off with a trim tool, and you can see the wiring from there or try the plastic panel where the bonnet release is (although that may be too far up?). If you do break any clips getting the cover off I have plenty of spares if you are close to Foggie... I want to see the sweets before I get into your windowless van... I'm not stupid!
Corris Grey D4 Commercial SE 2016
Zermatt Sliver 2007 D3 SE manual (gone)
Indus Silver D4 HSE 2015 (gone)
Bonatti Grey D3 HSE 2006 (gone)
White D3 S (LHD) 2007 (gone)
Firenze Red D4 HSE 2014 (gone)
Black RRS 3.6TDV8 2008 (gone)
Rusty Green Defender 110 1997 (gone)
Black FL2 HSE 2013 (gone)
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| 24th Oct 2023 2:04 pm |
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Rodent
Member Since: 03 Nov 2013
Location: Aberdeenshire
Posts: 64
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Cheers Nigethecat, i’ll see if i can get the sill covers off for a look. We must be almost neighbours….i’m just along the Deveron, near Netherdale!😁
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| 24th Oct 2023 2:26 pm |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18506
 
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Did you definitely prove the wire is ok at the connectors at the back?
https://www.disco3.co.uk/forum/topic205982.html 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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| 24th Oct 2023 2:35 pm |
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nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4187
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Rodent wrote:Cheers Nigethecat, i’ll see if i can get the sill covers off for a look. We must be almost neighbours….i’m just along the Deveron, near Netherdale!😁
I don't think we've met but I certainly know a few of your neighbours  You must know Graham the farrier at Cobblehouse Cabins (also with Disco) ? And Richard at North East Brakes ? (other side of the river).
I'm just by the river near Marnoch  I want to see the sweets before I get into your windowless van... I'm not stupid!
Corris Grey D4 Commercial SE 2016
Zermatt Sliver 2007 D3 SE manual (gone)
Indus Silver D4 HSE 2015 (gone)
Bonatti Grey D3 HSE 2006 (gone)
White D3 S (LHD) 2007 (gone)
Firenze Red D4 HSE 2014 (gone)
Black RRS 3.6TDV8 2008 (gone)
Rusty Green Defender 110 1997 (gone)
Black FL2 HSE 2013 (gone)
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| 24th Oct 2023 3:24 pm |
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Rodent
Member Since: 03 Nov 2013
Location: Aberdeenshire
Posts: 64
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Martin wrote:Did you definitely prove the wire is ok at the connectors at the back?
https://www.disco3.co.uk/forum/topic205982.html
Hi Martin,
I’ve checked for continuity from the multi plug at the epb module and it’s showing good continuity from the epb module multi plug across to the osr connector, and also across the connector itself.
At the switch end, there is continuity from the switch connector to the grey multi plug (the one very close to the switch).
But the yellow wire from this grey plug, back to the osr wheel arch multi plug shows infinite resistance.
Hence, my theory is a broken yellow wire somewhere between the rubber boot in the nsr wheel arch (where the loom goes up into the body) and where it reappears at the brake switch.
My thinking is I will need to remove the carpets and maybe the passenger front seat.
Does that sound fair?
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| 24th Oct 2023 7:45 pm |
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Rodent
Member Since: 03 Nov 2013
Location: Aberdeenshire
Posts: 64
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Update: today I removed the sill cover, passenger front seat and the rear interior trim panel. Traced the wiring loom and eventually found a tiny spot of corrosion on the yellow wire near where the loom runs past the rear passenger door. I cut out the corroded piece, re-soldered the wire together and put heat shrink on the joint. And voila, epb up and running again.
Was slightly concerned at how many previous repairs there are in the wiring loom, but at least the epb now works again - just in time for the mot this week.
Many thanks to all for helping me to understand this fault 🙂
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| 29th Oct 2023 6:38 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10530
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It’s normal for there to be blue joints if that’s what you found ?
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| 29th Oct 2023 7:15 pm |
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Rodent
Member Since: 03 Nov 2013
Location: Aberdeenshire
Posts: 64
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Hi Pete, yes blue insulating tape (double width), under which I found the bare wires crimped. It looked quite crude, surely it didn’t leave the factory like that?
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| 29th Oct 2023 7:22 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10530
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yeap 
And the joints aren't very reliable. At least you know what they look like now, when you need to find them.
Most common issue is the key fob not working. (green wire crimp at front)
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| 29th Oct 2023 8:24 pm |
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