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987 Forum Discussion about the Cayman/Boxster variants (2004-2012)

interior lights to led-now issues

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Old Oct 10, 2021 | 11:41 AM
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Default interior lights to led-now issues

I just swapped out all of the interior lights with a kit. There was some odd behavior going on during the swap. The glove box worked after swap, then stopped, now works fine. While I was doing the vanity mirrors for a while the passenger one would go on and off when I flipped the driver's side up and down, while I was getting that side sorted. Now everything is in and the footwell lights do not work. I swapped one with the working glovebox unit, and tried putting the original bulbs back in-nothing. It seems like some odd computer thing-wouldn't be the first. I don't think it's a fuse, I did check, and everything else in the car works. Any insight is appreciated-someone else had to have had the same issue-
cheers

forgot this-'05 Boxster S

this is the kit-
Amazon Amazon

Last edited by J Free; Oct 10, 2021 at 12:00 PM. Reason: new info
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Old Oct 10, 2021 | 11:50 AM
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Hello, it would probably be helpful to describe your vehicle and year. Without that info, I can be vague. LEDs work at different specs that the original bulbs do, so they can play nasty tricks on any modules controlling them. The modules are looking for feedback from the bulbs that is not present in the LED.
If you want to prove it out, install the factory bulbs, and you may have to disconnect power to the LCM to have it reset.
I have seen all sorts of issues with LED bulbs that don't have the correct resistance.

Good luck

Rich
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Old Oct 10, 2021 | 11:51 AM
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LED’s are diodes or electrical “one way valves” it can be that one of them is backwards. Do you have a meter?

Also, make sure the electrical contacts of each socket are in good shape and didn’t bend

Last edited by 991Targa4S; Oct 10, 2021 at 11:56 AM.
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Old Oct 10, 2021 | 12:05 PM
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I am aware of the polarity requirement. I have done this on other vehicles. I tried flipping around, and swapping with the glovebox unit, which is known to work. I did try disconnecting the battery. I swapped in an original in the footwell to check. I do have a meter.
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Old Oct 11, 2021 | 07:25 PM
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Sounds basic, but check for voltage at the bulb socket.
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Old Oct 11, 2021 | 08:03 PM
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Will do in the AM-I don't suspect there will be any, but we shall see.
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Old Oct 12, 2021 | 12:36 AM
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Are there any dimmers on those circuits? If there are try adjusting them.
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Old Oct 12, 2021 | 07:25 PM
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OK-up and running. Inside one of the two housings was a diode (I believe) on one side of the terminals-it must be gone because it wasn't passing juice through it. When I jumped and took it out of the equation the light worked. Mysteriously the other side started working too-didn't do anything different there. I've got no legit explanation for that part, or explanation why the glovebox light wouldn't work in either footwell. Thanks for all the suggestions.
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Old Oct 13, 2021 | 12:02 PM
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IIRC (and it's been a while) on my 987.2 the glovebox light lens had a zener diode in the circuit. I believe this was to drop the voltage a bit so the glovebox light wasn't too bright.

Last edited by MrMoose; Oct 13, 2021 at 12:03 PM.
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Old Oct 13, 2021 | 09:04 PM
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Originally Posted by MrMoose
IIRC (and it's been a while) on my 987.2 the glovebox light lens had a zener diode in the circuit. I believe this was to drop the voltage a bit so the glovebox light wasn't too bright.
Interesting, that's probably it. With all the swapping back and forth troubleshooting, the glovebox light def could have ended up in the footwell.
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