Submariner1
Senior Member
- Joined
- Sep 3, 2016
- Messages
- 4,692
- Reaction score
- 788
- Location
- Windsor Berkshire
- Your Mercedes
- CL500 2009 5.5
I bought these from an eBay seller claiming to be an official Osram Partner.
Neither worked!
So I then tried the original bulbs, both didn't work, but they did before.
Here is the weird bit:-
I had to turn the side lights on and off , and then the original bulbs worked perfectly again.
These Osrams look like they fit perfectly. Note all the other MB lights work perfectly.
Thinking this was probably an odd car glitch, I tried the Osram LEDs again. Both Didn't work.
So I tried the original MB ones again, same oddity. Turned the sidelights on and off, and the MB ones work perfectly, with or without sidelights.
Shut the boot 5 x ... all good, they go on and off as they should with the MB original bulbs.
I then tried the free set of 5W5s that came with my Phillips White Vision cornering H7. And they worked perfectly. So imo there is nothing wrong with the car.
so the question is
1. Can one test an LED bulb with a multimeter? I.e. check resistance or dont LEDs work like that?
2. Could there be something in the Mercedes circuit, that prevents the car powering a 1W LED. Instead of a normal 501 5 watt bulb? [I don't think there is]
Note: If I take one or even two of the normal MB 5W5 bulbs out, the other one still works, and there are no canbus warning messages like a failed bulb. If I later put one or both back .... it or theynjust work.
So IMO the boot lights are not on the Canbus warning system.
3. Is it worth getting a link off the Osram site to an officail reseller, like Power-bulbs, and trying again with LEDs?
I.e. I just got conned with rubbish fakes
Appreciate your views, but Sadly I can’t do any suggested testing, as the car is now at the Dealers (sorting out another not connected issue).
Note I have upgraded 6 of the front bulbs ... all perfect. But they were bought from Powerbulbs.
Neither worked!
So I then tried the original bulbs, both didn't work, but they did before.
Here is the weird bit:-
I had to turn the side lights on and off , and then the original bulbs worked perfectly again.
These Osrams look like they fit perfectly. Note all the other MB lights work perfectly.
Thinking this was probably an odd car glitch, I tried the Osram LEDs again. Both Didn't work.
So I tried the original MB ones again, same oddity. Turned the sidelights on and off, and the MB ones work perfectly, with or without sidelights.
Shut the boot 5 x ... all good, they go on and off as they should with the MB original bulbs.
I then tried the free set of 5W5s that came with my Phillips White Vision cornering H7. And they worked perfectly. So imo there is nothing wrong with the car.
so the question is
1. Can one test an LED bulb with a multimeter? I.e. check resistance or dont LEDs work like that?
2. Could there be something in the Mercedes circuit, that prevents the car powering a 1W LED. Instead of a normal 501 5 watt bulb? [I don't think there is]
Note: If I take one or even two of the normal MB 5W5 bulbs out, the other one still works, and there are no canbus warning messages like a failed bulb. If I later put one or both back .... it or theynjust work.
So IMO the boot lights are not on the Canbus warning system.
3. Is it worth getting a link off the Osram site to an officail reseller, like Power-bulbs, and trying again with LEDs?
I.e. I just got conned with rubbish fakes
Appreciate your views, but Sadly I can’t do any suggested testing, as the car is now at the Dealers (sorting out another not connected issue).
Note I have upgraded 6 of the front bulbs ... all perfect. But they were bought from Powerbulbs.
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