MindMind
New Member
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- Jul 2, 2021
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- Your Mercedes
- A180 cdi 2008 2.0lt diesel W169
Hi all.
Has anyone come across this problem? Any help would be great!
A friend of mine has a 2008 A180 CDI W169 that has just failed it MOT because the full-beam light will not switch on.
I started the process of diagnosing the fault after the chap at the garage doing the MOT said he couldn't sort it.
I started with the bulbs, but they're both good, replaced them anyway, but no change. Checked the fuses, but the only one I can find is #29 - that's the 30A fuse for the SAM unit - all good.
Received some advice from another mechanic that said changing the multi-function control (indicator stalk) might solve it, even though the little blue light does comes on the display. I swapped it for a 2nd-hand control, but nothing changed. Little blue light shows when I turn on the full-beam, but no full-beam comes on.
So I checked the wires from the bulbs to the SAM, but they're all good. However, I checked the SAM to see if it was supplying 12V to the full-beam and it wasn't when I turned them on. So I swapped the SAM with a 2nd-hand unit, but nothing changed. Still won't work.
Starting to sound like a wiring fault, but I can't find wiring diagrams that help, or even if there's something between the Stalk and the SAM that could be at fault.
Any ideas?
Thanks for reading.
Has anyone come across this problem? Any help would be great!
A friend of mine has a 2008 A180 CDI W169 that has just failed it MOT because the full-beam light will not switch on.
I started the process of diagnosing the fault after the chap at the garage doing the MOT said he couldn't sort it.
I started with the bulbs, but they're both good, replaced them anyway, but no change. Checked the fuses, but the only one I can find is #29 - that's the 30A fuse for the SAM unit - all good.
Received some advice from another mechanic that said changing the multi-function control (indicator stalk) might solve it, even though the little blue light does comes on the display. I swapped it for a 2nd-hand control, but nothing changed. Little blue light shows when I turn on the full-beam, but no full-beam comes on.
So I checked the wires from the bulbs to the SAM, but they're all good. However, I checked the SAM to see if it was supplying 12V to the full-beam and it wasn't when I turned them on. So I swapped the SAM with a 2nd-hand unit, but nothing changed. Still won't work.
Starting to sound like a wiring fault, but I can't find wiring diagrams that help, or even if there's something between the Stalk and the SAM that could be at fault.
Any ideas?
Thanks for reading.
