Rear light problem.

60041 · Nov 19th, 2022, 19:47

Rear light problem.
2018 V90 CC.
When I started my car yesterday, it flagged up a message: “rear marker light malfunction”, a quick check revealed that the n/s/r light was not lit.
When I got home, it was out when I opened the tailgate, but when I went out later and unlocked the car and opened the tailgate, it came on. I tried the side lights, and it came on, but when I started the car, the message reappeared and the light was not working again.
This suggests to me that it is a can-bus error, rather than the light itself; does anybody have any suggestions?
Is there a quick re-set, or is it an expensive 130 mile round trip to the dealer?
I am willing and prepared to tackle any mechanical issues, but modern electrics are akin to the dark arts, as far as I’m concerned.
Sod’s Law, of course, in that it is due an MOT in 10 days time!

Quaffwine · Nov 19th, 2022, 23:12

Perhaps a low battery. Tends to throw things like this. Fairly sure mine needs a new batter soon as occasionally get a headlamp malfunction warning never around for long.

SnineT · Nov 19th, 2022, 23:28

It's most likely you have a dying bulb that you've since knocked the filament back into place, sometimes it goes on sometimes it doesn't this is assuming the car has bulbs still and not LED.

If it has LED which I think it does *never got that far with mine* you could be looking at a new light as I believe they are sealed (corrections welcome) for life, I would unclip the loom, check for moisture and dirt then reconnect and pray.

Don't rule out what Quaff said either.

60041 · Nov 20th, 2022, 00:12

Quote:

Originally Posted by SnineT

It's most likely you have a dying bulb that you've since knocked the filament back into place, sometimes it goes on sometimes it doesn't this is assuming the car has bulbs still and not LED.

If it has LED which I think it does *never got that far with mine* you could be looking at a new light as I believe they are sealed (corrections welcome) for life, I would unclip the loom, check for moisture and dirt then reconnect and pray.

Don't rule out what Quaff said either.

LED I’m afraid, cheapest I have seen is £303, main dealer price will no doubt be much more. I will check connections tomorrow, but I’m not hopeful.
The message appeared after a 40 mile journey, so unlikely to be a low battery, but it’s something else I will check.

SnineT · Nov 20th, 2022, 10:15

Quote:

Originally Posted by 60041

LED I’m afraid, cheapest I have seen is £303, main dealer price will no doubt be much more. I will check connections tomorrow, but I’m not hopeful.
The message appeared after a 40 mile journey, so unlikely to be a low battery, but it’s something else I will check.

Have a look for an auto electrician or indeed a hobbyist one who may be able to open it up and fit a new set of diodes for you.

If this cheers you up a bit thank God it's not a front one, £2000 for the ones that haven't got cornering and £2500 if they have, almost an excuse to ram a parked car.

Lancee · Nov 20th, 2022, 10:42

If you can open it up it may be a dry solder joint ?

Gluas · Feb 2nd, 2023, 11:51

Hi,
I was wondering how you got on with this. I had an intermittent fault (usually when I had driven over 100 miles) on the rear passenger side. It is now permanent for the last couple of days. Did you have to replace?
Many thanks.
Martin

Nov 19th, 2022, 19:47	#1
60041 Premier Member Last Online: May 23rd, 2024 21:01 Join Date: Feb 2010 Location: North Northumberland	Rear light problem. Rear light problem. 2018 V90 CC. When I started my car yesterday, it flagged up a message: “rear marker light malfunction”, a quick check revealed that the n/s/r light was not lit. When I got home, it was out when I opened the tailgate, but when I went out later and unlocked the car and opened the tailgate, it came on. I tried the side lights, and it came on, but when I started the car, the message reappeared and the light was not working again. This suggests to me that it is a can-bus error, rather than the light itself; does anybody have any suggestions? Is there a quick re-set, or is it an expensive 130 mile round trip to the dealer? I am willing and prepared to tackle any mechanical issues, but modern electrics are akin to the dark arts, as far as I’m concerned. Sod’s Law, of course, in that it is due an MOT in 10 days time! __________________ 2018 V90CC D4, 2022 XC40 1940 Matchless G3, 1980 Moto Guzzi T3 Coming soon:- 1947Rover 14 P2 Last edited by 60041; Nov 19th, 2022 at 19:51.

Nov 19th, 2022, 23:12	#2
Quaffwine Junior Member Last Online: Apr 10th, 2024 17:16 Join Date: Oct 2020 Location: Edinburgh	Perhaps a low battery. Tends to throw things like this. Fairly sure mine needs a new batter soon as occasionally get a headlamp malfunction warning never around for long. __________________ Volvo v90 CC D5 B&W Xenium Winter etc

Nov 19th, 2022, 23:28	#3
SnineT Extrahumanestrial Last Online: Feb 13th, 2023 19:02 Join Date: Jun 2022 Location: Budapest	It's most likely you have a dying bulb that you've since knocked the filament back into place, sometimes it goes on sometimes it doesn't this is assuming the car has bulbs still and not LED. If it has LED which I think it does never got that far with mine you could be looking at a new light as I believe they are sealed (corrections welcome) for life, I would unclip the loom, check for moisture and dirt then reconnect and pray. Don't rule out what Quaff said either.

Nov 20th, 2022, 10:42	#6
Lancee Premier Member Last Online: Today 10:22 Join Date: Jun 2009 Location: Devon	If you can open it up it may be a dry solder joint ?

Feb 2nd, 2023, 11:51	#7
Gluas New Member Last Online: Mar 12th, 2024 11:55 Join Date: Sep 2020 Location: Navan	Hi, I was wondering how you got on with this. I had an intermittent fault (usually when I had driven over 100 miles) on the rear passenger side. It is now permanent for the last couple of days. Did you have to replace? Many thanks. Martin

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