Member Since: 01 May 2019
Location: Nice
Posts: 88
Rear fog lights problem after tow bar electrics fittement
Hi Guys,
Looking for a good soul who would check their GAP IID level settings and have 13 pin tow bar electrics installed and with properly working rear fog lights.
My D4 got Brink tow bar electrics have fitted and all works fine but the rear fog lights part.
It is MY10 in US spec (NAS) aka LR4. Rear fog lights did work without tow bar electrics fitment.
The way it is fit is that signal comes through 4 & 6 pin connectors on the left side of the cargo (fed to 2 -> white) and if trailer electrics is not attached it feeds rear fog lights via 2a (pictures attached).
Checking voltage with switch on, there's no voltage on the white wire 2. So it all looks like it is just not provided by the car. As part of troubleshooting, it has been verified that lamps do work still and the voltage is supplied on the direct plug, but not the one for trailer socket.
This led me to the fact that using GAP IID maybe settings were chosen incorrectly?
Attached is picture of current one, but I've tried 2 other with same effect.
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4142
Will check for you later today...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)
28th Jul 2020 8:12 am
eightfoot
Member Since: 12 Apr 2015
Location: sunny essex
Posts: 762
Are you saying that the fog lights on your vehicle don't work when you plug in your trailer? If so then that's how they work there not supposed to come on only the trailer fogs should light upplease excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4
28th Jul 2020 9:54 am
nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4142
I also have the Brink electrics and just checked my fog lights, they work fine when no trailer connected and are disabled when a trailer is hooked on... exactly as they are supposed to... the idea of disconnecting them with a trailer on is so your not lighting up the front of your trailer (or caravan) with red light when it’s foggy.. no one behind you would (unless you have a very small trailer) be able to see them anyway...
I checked my IID and for some reason I don’t have the options you do, just a confirmation that the towball is fitted
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)
28th Jul 2020 11:30 am
lrovy
Member Since: 01 May 2019
Location: Nice
Posts: 88
@nightcat - thank you very much.
I don't have rear for lights on with or without trailer connected when Brink wiring is connected. With Bink connected, car rear fog light is powered up by wire from the tow socket (2a) which gets the feed from (2) which originally comes through white wire from 4&6 pin socket for connecting tow electrics.
Rear fog lights are not powered through that hence my suspicion is on the CCF.
The only time when I get rear fog lights is connecting rear lights straight without that Brink pass through which effectively cuts the fog part to have that dependency on/off for fog lights with trailer connected or not.
Weird that I have more options. Which year is your car?
If you'd go, one level higher - do you have more "trailer" related settings?
Could it be cause it's HSE/NAS in my case?
28th Jul 2020 12:23 pm
Hot Tub
Member Since: 15 Aug 2017
Location: Milton Keynes
Posts: 1071
I think on the 13pin socket it has a switch which the when a plug is connected opens contact might be sticking.Welsh Collie Chauffeur Service To Barney & Rooney.
28th Jul 2020 1:18 pm
nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4142
@Irovy, I have a 2006 D3 (LR3 to those across the pond) which might explain the differences between this and your LR4... I don't have any other options above this in the menu....
Just to be clear you are getting no fog lights at all (either with or without a trailer attached) unless you disconnect the tow bar wiring ? Is this correct? When you disconnect the wiring your fog lights return ?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)
28th Jul 2020 2:11 pm
lrovy
Member Since: 01 May 2019
Location: Nice
Posts: 88
Hot Tub wrote:
I think on the 13pin socket it has a switch which the when a plug is connected opens contact might be sticking.
I've checked that the feed from the car (pin 2) is not powered - checked that on the wire side - didn't verify at car socket level in the 4&6 pin socket in the trunk - but honestly don't expect it to be a wire problem and suspect CCF problem.
nigethecat wrote:
@Irovy, I have a 2006 D3 (LR3 to those across the pond) which might explain the differences between this and your LR4... I don't have any other options above this in the menu....
Just to be clear you are getting no fog lights at all (either with or without a trailer attached) unless you disconnect the tow bar wiring ? Is this correct? When you disconnect the wiring your fog lights return ?
Yeah, D3 vs D4 might explain the difference in IID options.
Yes, to the second one too - as soon as the tow bar wiring is put in place - no rear fog lights. If connected straight - all works. All in all - it tells me there's no power going out of the car to the tow bar for rear fog lights (with or without trailer plug connected and also trailer doesn't get fog lights power either - this is how I've discovered that it doesn't work as part of MOT check for the tow bar wiring).
28th Jul 2020 5:00 pm
charlietortoise
Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 502
Wires
Hi there, I fitted an after market kit. It had a bridging wire harness about 120mm long that fitted between the tow electrics and the light clusters.
When fitted my fogs just would not work. When not fitted they worked fine. I just left the bridging harness out and everything worked as it should on the car and on the trailer.
My tow bar fitment was enabled in the car config.Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch 😂
28th Jul 2020 7:13 pm
charlietortoise
Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 502
Looks to be the same set up as I fitted (mine is twin socket though) I would suggest trying it without the links.
I have used it with three different trailer boards and it is all working as it should.Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch 😂
28th Jul 2020 7:16 pm
lrovy
Member Since: 01 May 2019
Location: Nice
Posts: 88
Thank you very much.
It seems to be this exact problem - don't know why my search didn't get with that result.
I'll give it a try disconnecting that pass-through portion.
The only problem I'm facing now is how to trick the car that trailer is connected as I don't have anything to connect - do you know which pins would I have to shortcut or put a resistance in between?
Thanks again for help.
29th Jul 2020 7:40 am
charlietortoise
Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 502
Pins
Hi, sorry no I dont. I just plugged in my trailer board.Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch 😂
29th Jul 2020 11:34 am
lrovy
Member Since: 01 May 2019
Location: Nice
Posts: 88
Thank you. I'll remove the pass-through part, re-configure it back to as thought it should be and will test it at MOT place.
31st Jul 2020 8:13 am
charlietortoise
Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 502
My settings
Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch 😂
31st Jul 2020 3:29 pm
lrovy
Member Since: 01 May 2019
Location: Nice
Posts: 88
charlietortoise, thank you very much again.
For the moment pass through is removed as we drove for some summer break. Once will be back will go to MOT guy to test if rear fog light works now.
Based on the links above provided seems to be the situation that D4 is the smart-ass beast and discover if trailer socket is occupied at ignition on time and adjusts which wire rear fog light signal is raised on.
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