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Discussion Starter #1 (Edited)
Hey guys, the rear fog is stuck on, on the 147. It came when testing out the lights and now does not respond to pressing the button. Any ideas where to look first?
 

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Problem with the actual switch, or a ground problem/short ?
Other then that the light is controlled by the bodycomputer, you could try disconnecting battery ground for 10 minutes or so to reset.
 

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Is it just on the left side by any chance? My car has the exact same (known) issue, the BCM which controls the electronics believes you have put the parking light on when you haven't, I haven't fixed mine yet but there are a couple of options available.

You can get a new BCM from Alfa, but that would be expensive (£600+) alternatively you can go to a specialist ECU company, they would essentially clone the info from your own BCM, upload it onto a "virginised" BCM and it should plug n play, this option is nearer the £200 mark, though prices may vary, I will be doing the latter when I can afford to.
 

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Discussion Starter #4
Problem with the actual switch, or a ground problem/short ?
Other then that the light is controlled by the bodycomputer, you could try disconnecting battery ground for 10 minutes or so to reset.
I have been disconnecting the battery as to not drain it, so I guess that leaves the other two reasons.

Should they be on with the lights off? As I did notice that the front fogs turn off if you switch off the headlights.
 

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Discussion Starter #5
Is it just on the left side by any chance? My car has the exact same (known) issue, the BCM which controls the electronics believes you have put the parking light on when you haven't, I haven't fixed mine yet but there are a couple of options available.

You can get a new BCM from Alfa, but that would be expensive (£600+) alternatively you can go to a specialist ECU company, they would essentially clone the info from your own BCM, upload it onto a "virginised" BCM and it should plug n play, this option is nearer the £200 mark, though prices may vary, I will be doing the latter when I can afford to.
Yeah it is on the left side, the right (reversing light) works as intended. Does yours stay on all the time though? I imagine that would be draining your battery rather quickly.
 

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Discussion Starter #6
I did forget to mention that I found that the number plate lights are missing, could that be a cause of this?
 

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Bodycomputer on the 147 has also been known to suffer from water/damp, causing oxidation.
You could check the bodycomputer, if this is the case people have had good results drying / cleaning of the oxidation.....
BCM is mounted on the back of the fusepanel
 

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Yeah it is on the left side, the right (reversing light) works as intended. Does yours stay on all the time though? I imagine that would be draining your battery rather quickly.
Yuup, it's almost always on, enginf n lights to off position, still on, I drive a good distance for work so the longest the car sits is about 8 hours but the battery isn't going to last too long I feel, but this is definitely sounding like the BCM fault
 

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Discussion Starter #10
Yuup, it's almost always on, enginf n lights to off position, still on, I drive a good distance for work so the longest the car sits is about 8 hours but the battery isn't going to last too long I feel, but this is definitely sounding like the BCM fault
Might be a dumb question, but why haven't you just removed the bulb?
 

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Might be a dumb question, but why haven't you just removed the bulb?
No a dumb question at all mate, but 2 reasons, firstly, the light would still be receiving the current without the bulb though not the full wattage so the battery would still drain, and secondly I have the face lift model and have to remove the entire light cluster out of the car as opposed to just the back and change the bulb.
 

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The bulb has a resistance which creates the current draw, no bulb means no current draw or battery drain.
 
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