Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515
D3 towing electrics, bit of advice please.
Hi all,
I’ve fitted the towing electrics for a trailer and although it’s not been programmed, I still thought they might work all they seem to do is when brake pedal is pressed one of the indicators comes on. Any ideas? Or is it a trip to the dealers. As far as I know when I fitted the loom it just plugged in.
Thanks in advance Lee.
4th Jul 2019 5:46 pm
M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
Programming it just stops the car fog light coming on when there’s a trailer fitted and also sets the suspension for a trailer. It should work, have you got the correct kit for your vehicle?
4th Jul 2019 6:49 pm
Biffysun
Member Since: 09 Jul 2011
Location: Central
Posts: 1787
How sure are you the trailer is wired correctly? Check thats ok then check with a known working trailer board or similar
4th Jul 2019 6:51 pm
Lee Trinder
Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515
M3bobby, that’s what I thought, it’s a genuine LR kit, but could be for a d4, I don’t know, but it plugged straight in and all the clips fitted.
Biffysun, it’s a brand new Thule easy base, the plug seems to match ok.
Thanks both.
4th Jul 2019 7:12 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
It will be the trailer wiring, check the earth wire
4th Jul 2019 7:40 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10362
What other symptoms do you get?
If the car has been configured to USA spec this will cause both indicators to come on when braking. And the indicators to work normally.
4th Jul 2019 7:43 pm
Lee Trinder
Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515
Thanks.
I’ll give it all a check over the weekend, and try to find out what’s going on.
The car is uk spec. It’s never had the electrics fitted or Towbar till now.
4th Jul 2019 7:52 pm
Lee Trinder
Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515
Have checked trailer lights, they work fine on another vehicle, anybody else had this issue?
Pete, I’m getting nothing apart from one indicator when brakes pressed.
5th Jul 2019 7:26 am
al cope
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10297
it cant be a D4 kit as these are very different to a D3 kit
AlVolvo XC90 B5 Plus Dark
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Now gone - MY16 D4 SE Tech, Loire Blue, Almond Leather, Privacy, plus some other goodies.
Old - MY12 D4 SDV6 XS Auto - Ipanema Sand with Almond Leather - Plus other niceties, and D4.com sticker
Older - D3 TDV6 XS Auto - Lugano Teal with Almond Leather, 20" Stormers, Shiny Tailpipes, DVD/TV - and obligatory D3 sticker
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5th Jul 2019 8:10 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10362
I would get a test lamp.
turn on the side lights.
And have a prod in the D3 connector.
the center pin should be + with the lights on.
If not, there should be some connectors visible when the rear left light is removed.
Inspect
and or look inside the car on the rear left.
check other pins on trailer socket.
Left indicator is at the top of the socket 1
right indicator at the bottom 4
5th Jul 2019 5:19 pm
Lee Trinder
Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515
Thanks, I’ll have proper go tomorrow when I have someone older that three to press the brake pedal and turn the lights on. Photo here shows plugs the plug with two pins in, it appears to show permanent live at both, I’m assuming they are for the caravan set up. And there is a plug behind the light that the white towing set plugs into. The plugs all seem to match, it’s whether they are playing all the right notes in the right order.
5th Jul 2019 6:04 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10362
Humm it doesn’t look genuine LR???
There are usually 6 fuses for the tow bar in there
5th Jul 2019 6:49 pm
Lee Trinder
Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515
Hi Pete,
I’m sure it is, it’s got a Land Rover cap on it, this is the other set I haven’t put that on yet.
Got them off someone on here
5th Jul 2019 7:15 pm
Lee Trinder
Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515
Hi,
Does anybody have a wiring diagram of what does what on the trailer socket?
6th Jul 2019 3:41 pm
Admirable
Member Since: 19 Jul 2015
Location: Fife
Posts: 1011
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How sure are you the trailer is wired correctly? Check thats ok then check with a known working trailer board or similar 
