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Fog lights stopped working

GR11M

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I don't know when they stopped working but the Diode Dynamics SS3 worked when I installed them. I checked the fuse diagram and found nothing that pointed to a specific fuse so I checked them all under the bonnet and the foot well and none were blown. I swapped back the original light and still nothing. I connected a voltmeter to the connector to the light while the engine was running but it's not getting any power. 🤷‍♂️
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Not my field.
However, in general, Won't a control module of some sort be in the equation?
 

Chappers

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Not my field.
However, in general, Won't a control module of some sort be in the equation?
Have you messed around with Forscan recently? have you inadvertently turned them off? have you tried the engine bay fuses and the BCM fuses?
 
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GR11M

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I do have Forscan but I've never changed anything with it, I was planning on having a look with that at some point too.

I took a photo and labelled all my fuses, I also tested relay 78 and 79 open but had to order some more cables before I can test the resistance. I've actually just got another battery too but that's likely not the cause. I'm thinking maybe something has happened when I was installing insullation into the foot well.

Inside-Fuses.jpg


Engine-Fuses.jpg
 

Chappers

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i wonder if you've inadvertently disconnected a wire somewhere? either in the switch itself or on the BCM, are you sure you put the connector back on the correct way as i've noticed you are able to reverse the polarity on the connector itself to the fog light
 

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GR11M

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Ok I got them working, not sure how though. I replaced the battery, then I connected forscan and ran some tests, reset and rescanned everything that had errors, most were from me disconnecting devices previously. I then noticed there's actually an on/off switch which was turned off, garage must have done it, I then noticed 1 was connected the wrong way, like you said they can be connected either way.
 

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Ok I got them working, not sure how though. I replaced the battery, then I connected forscan and ran some tests, reset and rescanned everything that had errors, most were from me disconnecting devices previously. I then noticed there's actually an on/off switch which was turned off, garage must have done it, I then noticed 1 was connected the wrong way, like you said they can be connected either way.
glad you got it solved :like: it's always annoying these electrical gremlins
 

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It's a pain but you learn so much fixing problems
definitely i'm now an expert in electrical boiler repairs after my boiler stopped working haha
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