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Rear hatch LED light emits dim glow when off


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So I replaced all my bulbs with Philips LED, this is on my 2012 Cayenne S. All of the w5w bulbs (194) went great and are the same white color as the original LEDs that came with the "comfort package". That being said I also replaced the rear hatch ceiling light which is a consumer replaceable standard 43mm festoon bulb. I also used the Philips vision line but for some reason that one light will emit a very dim glow after all other lights have dimmed to nothing. LED lights do not by nature emit a glow after shutting off and I have not ran into this before. Here is what it looks like and another shot at the end showing it on full blast so you can see it is far from on. It never gets any more dim, so I removed it in the meantime.

post-102423-144410046867_thumb.jpgpost-102423-144410047854_thumb.jpgpost-102423-144410048918_thumb.jpg

And here it is on regular brightness for reference.

post-102423-14441005178_thumb.jpg

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Your problem is a simple one; when the system is dimmed, there is still a low voltage on the wires, enough to illuminate the LED's, which require amazing little power to light, but not enough to do the same with the incandescent bulbs.  Happens to be a common issue, requiring the addition of resistors.  LED have such low resistance that we often see customer's that replace exterior running lights getting  "bulb out" warnings on some cars because the system cannot even see the LED's.

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Thanks. That is what I arrived at so I decided to suck it up and buy the factory kit. I thought a bulb was a bulb as long as it was not can-bus, but not so fast. So as a warning to anyone else thinking of it, be advised to not mess with anything other than factory no matter how high the quality.

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Thanks. That is what I arrived at so I decided to suck it up and buy the factory kit. I thought a bulb was a bulb as long as it was not can-bus, but not so fast. So as a warning to anyone else thinking of it, be advised to not mess with anything other than factory no matter how high the quality.

 

Don't feel bad, a lot of different makes suffer from this issue, we see it all the time.

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  • 3 weeks later...

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