Alfa 159 TBi rear fog light has stopped working - Alfa Romeo Forum
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(Post Link) post #1 of 11 Old 02-10-16 Thread Starter
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Alfa 159 TBi rear fog light has stopped working

Hi, I am new to the site, but not new to cars and their problems.

I have a 159 TBi saloon which I took for MOT yesterday. The car has been and still is great, with no problems of consequence before this one.
The car went to the testing station with everything working and in fact would have passed the MOT, if I hadn't been notified that my rear fog light was now not working, and so it failed.

Now let me stress it was and has always been fine, but now I am left with this issue which is annoying. I have a knowledge of cars, so have gone through the usual checks, bulbs, wiring to a point, though I have yet to find the fuse for the rear fog light, or the relay it uses. No mention in any Alfa documentation or online!!

Does anyone know where I can find the fuse and relay for the rear fog light, or has anyone had this issue? I have read some similar threads, but with no definitive solution.
I now have a 'bulb out' warning on the dash, though the bulb is fine.

This is very frustrating and so any help or assistance would be appreciated, as I want to try and take it back to the MOT garage tomorrow if possible.

Cheers
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No fuse or relay, signal comes straight from the body computer when it receives the input form the switch.
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Is it the right bulb?


New one could have been mixed up with a dual element one.
I think they fit but don't make contact.

(The brake and rear lights use dual-element bulbs but only use
one element from each. Not sure about the fog/reversing lights.)
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(Post Link) post #4 of 11 Old 02-10-16 Thread Starter
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Quote:
Originally Posted by Mito_No3 View Post
No fuse or relay, signal comes straight from the body computer when it receives the input form the switch.
Hi Mito_No3. Thank you for your response, that was exactly what I was looking for!
Do you know if there is anything I can measure signal wise with a voltmeter, and if so where from?

Thanks
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Member car:

AR 159 sw 2.4

I had No light in left fog..turned out to be bad connection in plug. Have you checked plug for corrosion?? Disconnect and connect a few times
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Hi, yes I have done all of that. There is no power at all, have checked with my multimeter. The positive side seems open circuit. The earth is good as it is shared with the sidelights.
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sometimes cables within rubber hose which goes between car body and boot lid gets broken. it is 15min job to strip things and inspect.connector sits very close to boot lid - under back window.
you can also download eLearn iso, use some virtual cd software or burn it on cd, install (including swf viewer version from installation!) and look at schematics/connector pinouts there,will be help to diagnose. there is no iso elearn for tbi (sine some time they offer online or usb key service documentation), but any older engine version will do for fogs.
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(Post Link) post #8 of 11 Old 03-10-16 Thread Starter
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Thank you, that is very useful. I did take the rubber out and look, but I will peel back the black covering to get to the wires, and do a continuity test. Otherwise I think it is looking like the body computer, from further discussions I have had, today.
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Hope this helps.

F036 is the fog
D040 is the boot connector
Attached Images
File Type: jpg Rear fog.jpg (42.4 KB, 16 views)
File Type: jpg Locations.jpg (84.4 KB, 16 views)
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(Post Link) post #10 of 11 Old 04-10-16 Thread Starter
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Thank you, much appreciated. This will really help.
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(Post Link) post #11 of 11 Old 04-10-16 Thread Starter
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You have all been a great help.I will let you know how I get on!
On a positive note, the garage saw sense and passed the car(MOT),which gives me a year to resolve.
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