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121chy
Member Since: 22 Nov 2014
Location: Swansea
Posts: 31
  
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| EPB and Ride Height Problems - CanBus/Electrical Issues? |
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I currently have a sick Disco sitting in my barn on its bump stops. It recently had issues with it's EPB so in order to pass the MOT, the garage bypassed the switch on the console so the EPB operated manually - but the EPB light is constant amber, they said something about a comms fault.
A short while after I got it back from the garage, a suspension fault occured an it sunk down to it's bump stops and there it has stayed.
Having seen some of the posts on here, I bought the Autel AP200 diag kit, plugged it in and got the following reports. I would appreciate any info you may have about my results.
I have a feeling that the comms is failing and that is what is caused both EPB and suspension faults but tbh I am guessing. Here's a link to some PDFs.
https://1drv.ms/b/s!AscFuWSEb64Vn3LcqKqDBa9BBfmX?e=jYarjn
Hope you can access this, it's a onedrive link.
Cheers,
Rich.
Last edited by 121chy on 7th Nov 2021 7:59 pm. Edited 1 time in total
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 12th Apr 2020 2:07 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
 
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check wiring at the rear left. for chaffing.
inspect the twisted yellow wires
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| 12th Apr 2020 4:43 pm |
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121chy
Member Since: 22 Nov 2014
Location: Swansea
Posts: 31
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Thanks Pete. Is the cable route obvious when I get under there?
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| 12th Apr 2020 7:37 pm |
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121chy
Member Since: 22 Nov 2014
Location: Swansea
Posts: 31
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OK, so I am finally getting around to fixing the disco, it's been in the barn gathering dust and on a battery conditioner for a while.
I've got the wheel arch covers off, got it onto axel stands and dropped the spare wheel. I've downloaded the circuit diagrams for the suspension module and deciphered them (I think). It looks like there are 4 connectors that are candidates for checking continuity.
One question, is there a way of identifying the location of the various connectors shown on the diagrams? eg. c2053->c2054, c2293->c2294.
I know that some are under the drivers-side front wheel arch cover, where are the others?
Thanks,
Rich.
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| 9th Sep 2020 4:29 pm |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18452
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Check the wires to the connectors top of the chassis rail, to the left of the spare wheel well. Particularly the black connectors, these are the C0390/C0376 pair:
https://www.disco3.co.uk/gallery/albums/userpics/10002/C0390.pdf
https://www.disco3.co.uk/gallery/albums/userpics/10002/C0376.pdf
I had broken EPB switch to EPB module wires here, so I bypassed the connector pair entirely for those, and it's been perfect since.
From the codes it looks likely you've got a broken or intermittent CAN bus to the EPB module, as Pete says check the yellow/brown and yellow/black wires - pins 4 5 6 7. There are two pairs as the EPB module has an in and out connection to the CAN bus.
To ID where the other connectors are and what they look like you need the Electrical Library (where those PDFs above come from) as well as the wiring diagrams. 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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| 10th Sep 2020 10:19 am |
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121chy
Member Since: 22 Nov 2014
Location: Swansea
Posts: 31
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Fab.
Just about ready to dive-in. I will document my findings.
Many thanks.
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| 10th Sep 2020 10:50 am |
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Martin
Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18452
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Definitely look here first, if you notice your diagnostic report does not report faults from the EPB module itself - suggesting it is missing from the CAN bus. 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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| 10th Sep 2020 10:56 am |
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121chy
Member Since: 22 Nov 2014
Location: Swansea
Posts: 31
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| New info - corroded cable |
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It's taking a while I know, and this is an old thread of mine, but Disco still on axle stands in my barn.
I had a look underneath this evening and found a corroded cable near the compressor cover.
https://drive.google.com/file/d/1gsc1egPTn...sp=sharing
on closer inspection and peeling back some of the protection, it looks like a previous repair to a rather thick green/yellow wire. The copper seems to have completely disintegrated.
https://drive.google.com/file/d/1govxZvJYu...sp=sharing
I'm guessing this is an earth cable, so I suspect it would cause all manor of problems. Question is, how do I repair it - being such a thick cable.
Cheers.
Rich.
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| 7th Nov 2021 7:33 pm |
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121chy
Member Since: 22 Nov 2014
Location: Swansea
Posts: 31
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Looking at the electrical diagram, page 12 (206-05) seems to be the only one that mentions a green/yellow cable. It looks like a 30A feed (hence cable thickness).
https://drive.google.com/file/d/1o-RTi7q3p...sp=sharing
That seems like an awful lot of current to put through a repaired cable, which might explain why the repair didn't last. LOL
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| 7th Nov 2021 7:52 pm |
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121chy
Member Since: 22 Nov 2014
Location: Swansea
Posts: 31
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BTW, what does the SJ prefix indicate on the wiring diagrams (eg SJ406 with a black dot) - I can't see any reference in the wiring doc.
I only have the "connector quick reference guide" for a Disco4 and the connectors all seem to start with 'C'.
Cheers.
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| 7th Nov 2021 8:06 pm |
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