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Sidewaysste
Member Since: 10 Oct 2021
Location: Pinxton Nottinghamshire
Posts: 25
  
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| 2010 D4 HSE Trailer towing |
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Do all D4s have the various trailer assist/stability programs?
Do they all come pre fitted with towing sockets?
I've just done my first towing trip with mine and although it tows beautifully, it doesn't appear to recognise that there is a trailer fitted, no extra menus come up or anything and the camera doesn't change in any way, also when reversing the parking sensors aren't disabled and therefore blare constantly.
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 2nd Nov 2021 1:49 pm |
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swansty
Member Since: 21 Sep 2008
Location: Northern Ireland
Posts: 940
 
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I think it was only later D4’s that have trailer assist
Towing electrics usually need activated so that parking sensors are deactivated
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| 2nd Nov 2021 1:54 pm |
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nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4244
 
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By towing sockets are you referring to the electrical connections ? None came fitted as standard but it was often specified as a factory or dealer fit option, this could either be 12N & 12S (two sockets one black one white) or 13 pin connector (single black socket).
If not fitted it is probably one of the easiest additions to make to the car as they are simple plug and play sockets, connecting behind the left hand trim panel in the boot (the wiring and connectors should already be there) if buying second-hand make sure you get both sections as there are two parts to the wiring, one runs from the towbar to behind the bumper, the second runs from the behind the bumper to the rear quarter panel in the boot, also a D3 loom will not fit a D4!
These days a 13 pin socket is the way to go as all trailers manufactured from 2013 (I think) and caravans from some time before should be fitted with the 13 pin connection.
If by towing socket you mean the receiver for the detachable towbar then yes, all Discovery's have this built in to the chassis, although if doing a lot of towing most on here go for a fixed towbar or fit a security plate over the detachable towbar.
https://www.ebay.co.uk/itm/174885641553?ep...SwkWZhE-Ow 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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| 2nd Nov 2021 2:19 pm |
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Sidewaysste
Member Since: 10 Oct 2021
Location: Pinxton Nottinghamshire
Posts: 25
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Hi, I meant the electrical sockets. I was under the impression that they came fitted with 12N/S or 13pin as standard from the factory. It appears I was mistaken.
I have 13 pin on mine. I assume that it's witter as I think that's what the tow bar itself is.
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| 2nd Nov 2021 2:44 pm |
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nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4244
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Ok, that's solved that one then  Swansty was correct in that it was only from around MY14+ that trailer assist was fitted as standard to all D4s, I don't know if it's possible to retrofit but you can certainly update the settings in your CCF to add trailer options with an IID tool (best investment you can make for your D4!), this will disable the rear parking sensors when reversing and also prevent the car fog lights when towing (assuming your trailer has fog lights).
Just be aware that the software on Discovery's has trouble recognising LED trailer lights and this can either mean the trailer is not recognised or the indicators flash at odd rates (not an issue with BMW's  ), can be fixed with additional resistors. 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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| 2nd Nov 2021 3:13 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8230
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If the tow bar is Witter it’s highly likely the add on electric connection cables are not genuine, with none genuine the tow assist etc will not work even if you have it and it is enabled in the CCF(car configuration file). It can when others can't,
It will when others won't,
It goes where others don't.
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| 2nd Nov 2021 6:26 pm |
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galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
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ours is 66 plate...dont think ive ever seen trailer assist come up...how do i find it...
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| 2nd Nov 2021 11:46 pm |
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Sidewaysste
Member Since: 10 Oct 2021
Location: Pinxton Nottinghamshire
Posts: 25
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M3DPO wrote:If the tow bar is Witter it’s highly likely the add on electric connection cables are not genuine, with none genuine the tow assist etc will not work even if you have it and it is enabled in the CCF(car configuration file).
I don't suppose you know where I might find a wiring diagram for the tow electrics do you?
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| 3rd Nov 2021 8:13 am |
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LIAMMCL
Member Since: 27 Aug 2013
Location: Northumberland
Posts: 414
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I have a 2010 and the first job when I bought it years ago was fit the tow electrics & tow trust bar.
Reasonably easy job when you're nervous around a new(to me), expensive & seemingly complicated car. I'd probably do it in half the time now.
I had it activated for cash while having other work done, but I don't get any tow assist etc. Also on mine it will only mute the reverse sensors if I plug the trailer in with the ignition on or the engine running. Puzzles me that one, but not really fussed about it.
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| 3rd Nov 2021 8:18 am |
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Kelvo
Member Since: 07 Aug 2015
Location: Perth WA
Posts: 264
 
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Trailer sway control was available 2010 onwards, this works even with no electrical connection between the D4 and trailer.
If your trailer has LED lights the D4 will not detect that a trailer is attached. When it knows a trailer is attached the rear fog lights and rear parking sensors are disabled, no automatic suspension height change happens when changing TR programs (Manual adjustment is still available) and auto box shift points are changed. To get around LEDs on the trailer just add LED load resistors to the trailer indicator circuits. I actually mounted my resistors permanently in my D4 and can turn them on or off via a switch. https://www.aulro.com/afvb/l319-discovery-...ost2916698 The resistors will only work if the trailer tow socket is wired into the D4 trailer harness. MY14 TDV6
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| 3rd Nov 2021 11:17 am |
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nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4244
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galwaygreen wrote:ours is 66 plate...dont think ive ever seen trailer assist come up...how do i find it...
It's in the settings if you have an IID tool... as said may require genuine LR wiring to the socket... hook up a trailer hit reverse and you should see extra lines in the camera (I did on my 2015 HSE)... 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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| 3rd Nov 2021 4:43 pm |
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Sidewaysste
Member Since: 10 Oct 2021
Location: Pinxton Nottinghamshire
Posts: 25
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Kelvo, thanks for that. The video was most informative.
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| 4th Nov 2021 11:07 am |
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