XC70: Electrical - High level brake light

Maudyxc70 · Sep 24th, 2018, 18:03

Hi,this is my first Volvo ,and I must say I'm rather impressed.All but for one thing up to press, which is the high level brake light , it has ceased to function, I have no onboard warning light telling me I have lights out ?But I have had a towbar fitted with the electrics wired up on a modual, and they took the brake lights hot wired off the high level brake wire above head lining!!! I have seen someone post a thread on this forum and this is something that is done .
It has been working fine for the last few months even with the caravan on ,now no brake light ?????

MartinK · Sep 25th, 2018, 09:09

One on ebay right now here
https://www.ebay.co.uk/itm/30678549-...EAAOSwttVaIpKP

Looks like the connector on the back is quite obvious. I would check the function of the brake light (i.e. wire direct to a power source) and work back from there...

Suprised the tow electrics are powered by this feed, mine wasn't - there's a connector block in the boot for that purpose..

Maudyxc70 · Sep 25th, 2018, 10:15

Would you say there's a relay in or near fuse box under glove box ,dedicated to the high level brake

GrantA · Sep 25th, 2018, 10:32

Hi Maudy,

I posted a Thread on the High Level Brake Light problem I had, it is here: https://www.volvoforums.org.uk/showt...iler+electrics Your problem could be the wire that was linked (spliced) into the high level brake light may have cut the power to the brake light. The only way to check it is to take off the trim on the roof inside the boot and check the wiring - if you find a loose wire then that is your problem. There are videos on YouTube showing how to remove the panel here is one of them: https://www.youtube.com/watch?v=wfV3...em-uploademail

The purists on here will no doubt argue the fact that your trailer electrics are spliced (hard wired) into the electrical system when you should have a "plug-in" module but my argument is that my car came that way when I bought it and it was an easy fix after I received advice from "Towingelectrics.com" who supplied the relay module that was fitted to my car.

Good luck, Grant

volvocat · Sep 25th, 2018, 11:00

Quote:

Originally Posted by Maudyxc70

Hi,this is my first Volvo ,and I must say I'm rather impressed.All but for one thing up to press, which is the high level brake light , it has ceased to function, I have no onboard warning light telling me I have lights out ?But I have had a towbar fitted with the electrics wired up on a modual, and they took the brake lights hot wired off the high level brake wire above head lining!!! I have seen someone post a thread on this forum and this is something that is done .
It has been working fine for the last few months even with the caravan on ,now no brake light ?????

As it's highly likely to be related to the towbar installation, surely they're the ones to fix it? - hopefully FOC...
I'd be taking it back to them pronto!

apersson850 · Sep 27th, 2018, 02:31

A towbar shouldn't be connected like that on these cars. There's a TRailer Module (TRM), which is a computer node like the other nodes in the car, that should be added to provide all signals to the towbar's socket. The constant +12 V feed is the only exception.

MartinK · Sep 27th, 2018, 13:47

^^ agree - mine had a plug-in kit - no need to splice any wiring...
https://www.pfjones.co.uk/Wiring_ins...19260519RC.pdf

Maudyxc70 · Sep 29th, 2018, 18:30

Well , just to let those and others who replied and viewed, problem solved, I think !!! Checked fuses all ok , checked wiring for breaks all ok , then with a scratch of my head , I decided to disconnect the battery and see if things reset , Bingo !!!! Brake light now working , Totally baffled, just wandering if lights on trailer had trip something!

Clan · Sep 29th, 2018, 19:52

Quote:

Originally Posted by Maudyxc70

Well , just to let those and others who replied and viewed, problem solved, I think !!! Checked fuses all ok , checked wiring for breaks all ok , then with a scratch of my head , I decided to disconnect the battery and see if things reset , Bingo !!!! Brake light now working , Totally baffled, just wandering if lights on trailer had trip something!

yes the electronic fuse no doubt .. too much current due to the bodged wiring ..

Sep 24th, 2018, 18:03	#1
Maudyxc70 New Member Last Online: Oct 3rd, 2018 21:54 Join Date: Sep 2018 Location: Cleckheaton	High level brake light Hi,this is my first Volvo ,and I must say I'm rather impressed.All but for one thing up to press, which is the high level brake light , it has ceased to function, I have no onboard warning light telling me I have lights out ?But I have had a towbar fitted with the electrics wired up on a modual, and they took the brake lights hot wired off the high level brake wire above head lining!!! I have seen someone post a thread on this forum and this is something that is done . It has been working fine for the last few months even with the caravan on ,now no brake light ?????

Sep 25th, 2018, 09:09	#2
MartinK Senior Member Last Online: Jan 10th, 2019 14:27 Join Date: Apr 2009 Location: Edinburgh & Aviemore	One on ebay right now here https://www.ebay.co.uk/itm/30678549-...EAAOSwttVaIpKP Looks like the connector on the back is quite obvious. I would check the function of the brake light (i.e. wire direct to a power source) and work back from there... Suprised the tow electrics are powered by this feed, mine wasn't - there's a connector block in the boot for that purpose.. __________________ 2009 XC70SE Geartronic

Sep 25th, 2018, 10:32	#4
GrantA Master Member Last Online: May 10th, 2019 09:02 Join Date: Feb 2012 Location: Inverness, Scotland	Hi Maudy, I posted a Thread on the High Level Brake Light problem I had, it is here: https://www.volvoforums.org.uk/showt...iler+electrics Your problem could be the wire that was linked (spliced) into the high level brake light may have cut the power to the brake light. The only way to check it is to take off the trim on the roof inside the boot and check the wiring - if you find a loose wire then that is your problem. There are videos on YouTube showing how to remove the panel here is one of them: https://www.youtube.com/watch?v=wfV3...em-uploademail The purists on here will no doubt argue the fact that your trailer electrics are spliced (hard wired) into the electrical system when you should have a "plug-in" module but my argument is that my car came that way when I bought it and it was an easy fix after I received advice from "Towingelectrics.com" who supplied the relay module that was fitted to my car. Good luck, Grant __________________ 2009 XC70 Geartronic SE Lux (185HP at the moment......) Porsche sold looking for a P1800.......

Sep 27th, 2018, 13:47	#7
MartinK Senior Member Last Online: Jan 10th, 2019 14:27 Join Date: Apr 2009 Location: Edinburgh & Aviemore	^^ agree - mine had a plug-in kit - no need to splice any wiring... https://www.pfjones.co.uk/Wiring_ins...19260519RC.pdf __________________ 2009 XC70SE Geartronic

Sep 25th, 2018, 10:15	#3
Maudyxc70 New Member Last Online: Oct 3rd, 2018 21:54 Join Date: Sep 2018 Location: Cleckheaton	Would you say there's a relay in or near fuse box under glove box ,dedicated to the high level brake

Sep 27th, 2018, 02:31	#6
apersson850 Premier Member Last Online: Apr 17th, 2024 21:40 Join Date: Jul 2011 Location: Traryd View Photos By: apersson850	A towbar shouldn't be connected like that on these cars. There's a TRailer Module (TRM), which is a computer node like the other nodes in the car, that should be added to provide all signals to the towbar's socket. The constant +12 V feed is the only exception.

Sep 29th, 2018, 18:30	#8
Maudyxc70 New Member Last Online: Oct 3rd, 2018 21:54 Join Date: Sep 2018 Location: Cleckheaton	Well , just to let those and others who replied and viewed, problem solved, I think !!! Checked fuses all ok , checked wiring for breaks all ok , then with a scratch of my head , I decided to disconnect the battery and see if things reset , Bingo !!!! Brake light now working , Totally baffled, just wandering if lights on trailer had trip something!

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