Rear fog lights

john-sussex · Sep 9th, 2018, 20:04

Ok i give up, warning on dash says rear fog light fail, neither work. however turn the switch on and the warning goes. Fuses as far as i see are good...next?

ma70 · Sep 9th, 2018, 21:11

Check the actual bulbs? Assuming they're good then clean the connectors? Maybe a bad earth if the warning is acting funny.

Does the telltale light on the dash work when switch is on?

john-sussex · Sep 10th, 2018, 05:00

Quote:

Originally Posted by ma70

Check the actual bulbs? Assuming they're good then clean the connectors? Maybe a bad earth if the warning is acting funny.

Does the telltale light on the dash work when switch is on?

Hi, yes bulbs are good, rear lights work normally, just fogs, and yes the switch telltale light too...

Not really sure of my way round on these canbus systems..

Missing Lincs · Sep 10th, 2018, 07:54

Do you have a towing socket (or is there evidence that one may have been fitted and removed)?

If there is/or was, look around the for extra connectors around the tailgate area or behind the light clusters. There is an factory socket for towbar electrics but not installs use it.

Operationally, on a RH drive vehicle, usually only the RH rear fog works.

john-sussex · Sep 12th, 2018, 18:13

Hi, no towbar, never has had one..

Missing Lincs · Sep 13th, 2018, 08:10

The next place I'd check is the REM (Rear Electronic Module). I'm not sure which relay is for the rear fog, perhaps Google will have the answer to that question. Also while you're looking at the REM, did you check the rear fog fuse on the REM?

barrybritcher · Sep 18th, 2018, 01:11

easy fix mate!

swap the relay in the boot (REM) with the reverse lights relay (assuming your reverse lights work)

hopefully they should then work and the reverse lights fail indicating a shagged relay

barrybritcher · Sep 18th, 2018, 01:16

the second column of relays swap the 4th one up (reverse) with the 6th one up (fogs)

barrybritcher · Sep 18th, 2018, 01:17

https://ww2-secure.justanswer.com/up...m_diagram..gif

Bassius · Sep 20th, 2018, 18:07

Hey,

I had the same problem a few weeks back. Bulb was good, fuse was good but as soon as i turned on the rear fog light, i got a warning.

After measuring all of it, it turned out that the lower rear light unit was broken. There was a small piece missing on the circuit, causing the fog light not to get any power.

Very strange as it always used to work, so i guess it burned through at some point.

If i recall correctly the bridge in the attached pic was missing.

Bought a 2nd hand unit off eBay for 50euros or so from a same age V70 to prevent any color difference. Works fine now...

Sep 9th, 2018, 20:04	#1
john-sussex Member Last Online: Yesterday 21:17 Join Date: Oct 2006 Location: storrington	Rear fog lights Ok i give up, warning on dash says rear fog light fail, neither work. however turn the switch on and the warning goes. Fuses as far as i see are good...next?

Sep 9th, 2018, 21:11	#2
ma70 Curmudgeon with a turbo Last Online: Jul 1st, 2020 17:48 Join Date: Nov 2014 Location: Congleton	Check the actual bulbs? Assuming they're good then clean the connectors? Maybe a bad earth if the warning is acting funny. Does the telltale light on the dash work when switch is on? __________________ (current) '06 P2 S80 D5 SE LUX, Met. Gold/Black leather, 200k (past)'99 P1.5 V40 SE 1.8 (1731cc), Metallic Peacock Blue-Green, Black Leather, Winter Pack. 101k (past) '88 340 GL 1.7, gifted to me with "slipping clutch" that was a sticky linkage

Sep 18th, 2018, 01:11	#7
barrybritcher Flaccid Member Last Online: Apr 15th, 2024 16:09 Join Date: Nov 2016 Location: Norwich	easy fix mate! swap the relay in the boot (REM) with the reverse lights relay (assuming your reverse lights work) hopefully they should then work and the reverse lights fail indicating a shagged relay __________________ 2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped) 2007 Volvo S60 T5 SE 2.4 Geartronic (Sold) 2008 Volvo V70 D5 SE Sport Geartronic (Current)

Sep 18th, 2018, 01:16	#8
barrybritcher Flaccid Member Last Online: Apr 15th, 2024 16:09 Join Date: Nov 2016 Location: Norwich	the second column of relays swap the 4th one up (reverse) with the 6th one up (fogs) __________________ 2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped) 2007 Volvo S60 T5 SE 2.4 Geartronic (Sold) 2008 Volvo V70 D5 SE Sport Geartronic (Current)

Sep 18th, 2018, 01:17	#9
barrybritcher Flaccid Member Last Online: Apr 15th, 2024 16:09 Join Date: Nov 2016 Location: Norwich	https://ww2-secure.justanswer.com/up...m_diagram..gif __________________ 2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped) 2007 Volvo S60 T5 SE 2.4 Geartronic (Sold) 2008 Volvo V70 D5 SE Sport Geartronic (Current)

Sep 10th, 2018, 07:54	#4
Missing Lincs Premier Member Last Online: Today 08:55 Join Date: Jan 2010 Location: Louth	Do you have a towing socket (or is there evidence that one may have been fitted and removed)? If there is/or was, look around the for extra connectors around the tailgate area or behind the light clusters. There is an factory socket for towbar electrics but not installs use it. Operationally, on a RH drive vehicle, usually only the RH rear fog works.

Sep 12th, 2018, 18:13	#5
john-sussex Member Last Online: Yesterday 21:17 Join Date: Oct 2006 Location: storrington	Hi, no towbar, never has had one..

Sep 13th, 2018, 08:10	#6
Missing Lincs Premier Member Last Online: Today 08:55 Join Date: Jan 2010 Location: Louth	The next place I'd check is the REM (Rear Electronic Module). I'm not sure which relay is for the rear fog, perhaps Google will have the answer to that question. Also while you're looking at the REM, did you check the rear fog fuse on the REM?

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