Rear fog light not working any ideas?

Goby · Oct 14th, 2023, 16:50

Hi all,

Ok so I got my MOT coming up in a month and my rear fog lights are not working.
I have checked the bulbs and ok, the fuse is also ok.
Looked at the earth point for the rear fog lights and goes to a green plug on the boot floor which I can’t seem to do much with.
If I have the headlight on and switch the rear fog light switch on the switch illuminates the icon on dash but no lights.

Please bear with me as I’m quite new to this and the electronics, I got a Haynes manual so any tips on how to start diagnosisi is the prob please.

ITSv40 · Oct 14th, 2023, 16:56

Stating which car you have may help folks diagnose the issue.

Goby · Oct 14th, 2023, 17:38

Ah sorry I thought I would appear in my post like yours.

Ok it’s a 1999 Volvo v70 xlt 2.4tdi.

Many thanks

4x4 · Oct 14th, 2023, 17:48

Did you have the ignition and headlamps on when checking?

Goby · Oct 14th, 2023, 17:52

Yes I had the car running, they did work but have just stopped

Luxobarge · Oct 14th, 2023, 18:05

Does your car have one rear fog light or two? Standard they have one, but it's really easy to do a modification to have two, many owners have done this.

This being the case, are you SURE you have checked the correct bulb? If you're not sure, use a multimeter or simple 12V test rig (you can use a battery charger if you're careful) and check ALL the bulbs in both clusters. Any you find where the glass has gone dark, change it, because even if it's working now the dark glass shows it's on its last legs.

Failing that, you'll need to take the multimeter and test for a 12V feed to the lamp cluster. If it's not there, you'll need to chase it back until you find the break.

HTH

Goby · Oct 14th, 2023, 18:19

Ah it has a build each side so I presume 2.
It’s the bulbs above the yellow indicators isn’t it?
Ok I will double check the bulbs agian and then use a voltmeter to check for voltage at the bulb holder.
I let you know how I get on will try it tomorrow as dark now.
Many thanks for the help!!

Lancee · Oct 14th, 2023, 19:03

Usually only one rear foglight, the offside, is in operation/lights up. The nearside one is not connected.

Hopefully you have not been focusing on fixing the nearside light ?

Goby · Oct 14th, 2023, 19:17

Ah ok that’s good to know but no neither of the lights work but will try agian tomorrow.

SteveSarre · Oct 14th, 2023, 21:15

Is there a fog light switch on the dash?

Steve

Oct 14th, 2023, 16:50	#1
Goby New Member Last Online: Jan 31st, 2024 15:43 Join Date: Feb 2018 Location: Horam	Rear fog light not working any ideas? Hi all, Ok so I got my MOT coming up in a month and my rear fog lights are not working. I have checked the bulbs and ok, the fuse is also ok. Looked at the earth point for the rear fog lights and goes to a green plug on the boot floor which I can’t seem to do much with. If I have the headlight on and switch the rear fog light switch on the switch illuminates the icon on dash but no lights. Please bear with me as I’m quite new to this and the electronics, I got a Haynes manual so any tips on how to start diagnosisi is the prob please.

Oct 14th, 2023, 16:56	#2
ITSv40 VOC Member Last Online: Today 11:45 Join Date: Mar 2008 Location: Northampton	Stating which car you have may help folks diagnose the issue. __________________ 2001 V40 2.0lt Sport lux - Daily Driver. 174k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 65k miles. http://www.neptuno6benagil.com

Oct 14th, 2023, 17:48	#4
4x4 Premier Member Last Online: Today 12:03 Join Date: Dec 2017 Location: North of Hadrian's Wall & South of Antonine's Wall View Photos By: 4x4	Did you have the ignition and headlamps on when checking? __________________ MY2010 XC90 SE (M66-manual) Magic Blue (467) Sold MY1997 850 GLT (62,000 miles) Silver Sand (419) MY2005 V70 2.5T (66,000 miles) Willow Green (471) Volvo 850 GLT website

Oct 14th, 2023, 17:52	#5
Goby New Member Last Online: Jan 31st, 2024 15:43 Join Date: Feb 2018 Location: Horam	Yes I had the car running, they did work but have just stopped Last edited by Goby; Oct 14th, 2023 at 17:56.

Oct 14th, 2023, 18:05	#6
Luxobarge Premier Member Last Online: Today 10:31 Join Date: Jan 2011 Location: Horne (Nr. Horley)	Does your car have one rear fog light or two? Standard they have one, but it's really easy to do a modification to have two, many owners have done this. This being the case, are you SURE you have checked the correct bulb? If you're not sure, use a multimeter or simple 12V test rig (you can use a battery charger if you're careful) and check ALL the bulbs in both clusters. Any you find where the glass has gone dark, change it, because even if it's working now the dark glass shows it's on its last legs. Failing that, you'll need to take the multimeter and test for a 12V feed to the lamp cluster. If it's not there, you'll need to chase it back until you find the break. HTH __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Oct 14th, 2023, 17:38	#3
Goby New Member Last Online: Jan 31st, 2024 15:43 Join Date: Feb 2018 Location: Horam	Ah sorry I thought I would appear in my post like yours. Ok it’s a 1999 Volvo v70 xlt 2.4tdi. Many thanks

Oct 14th, 2023, 18:19	#7
Goby New Member Last Online: Jan 31st, 2024 15:43 Join Date: Feb 2018 Location: Horam	Ah it has a build each side so I presume 2. It’s the bulbs above the yellow indicators isn’t it? Ok I will double check the bulbs agian and then use a voltmeter to check for voltage at the bulb holder. I let you know how I get on will try it tomorrow as dark now. Many thanks for the help!!

Oct 14th, 2023, 19:03	#8
Lancee Premier Member Last Online: Today 12:24 Join Date: Jun 2009 Location: Devon	Usually only one rear foglight, the offside, is in operation/lights up. The nearside one is not connected. Hopefully you have not been focusing on fixing the nearside light ?

Oct 14th, 2023, 19:17	#9
Goby New Member Last Online: Jan 31st, 2024 15:43 Join Date: Feb 2018 Location: Horam	Ah ok that’s good to know but no neither of the lights work but will try agian tomorrow.

Oct 14th, 2023, 21:15	#10
SteveSarre Premier Member Last Online: May 2nd, 2024 17:17 Join Date: Oct 2004 Location: London/West Country	Is there a fog light switch on the dash? Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

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