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Thread: HVAC LED bulbs not working

  1. #1
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    HVAC LED bulbs not working

    Well I finally got around to installing the HVAC led bulbs I ordered from DGo a while ago. Upon testing them prior to reinstalling the center console I discovered that none of them light up. Iím sure itís something stupid that Iíve missed. Any ideas?
    DMCF rebuild 2008, Stage II, Eibach

  2. #2
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    Quote Originally Posted by CFI View Post
    Well I finally got around to installing the HVAC led bulbs I ordered from DGo a while ago. Upon testing them prior to reinstalling the center console I discovered that none of them light up. Iím sure itís something stupid that Iíve missed. Any ideas?
    Some LED's are polarity sensitive. Maybe that is the problem

  3. #3
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    Quote Originally Posted by JETS 81 DMC View Post
    Some LED's are polarity sensitive. Maybe that is the problem
    Iím not sure how I would correct that though.
    DMCF rebuild 2008, Stage II, Eibach

  4. #4
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    Lol I figured it out. I was testing them by turning on the headlights. However, it turns out that the entire electrical system needs to be on. I put the key in the ignition and they all came on.
    DMCF rebuild 2008, Stage II, Eibach

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    Quote Originally Posted by CFI View Post
    Lol I figured it out. I was testing them by turning on the headlights. However, it turns out that the entire electrical system needs to be on. I put the key in the ignition and they all came on.
    Great you got it figured out. Been there done that too.
    By polarity you would remove the bulb turn it around so the bulb terminals plug in opposite from where they were.
    Not all LED's are that way but some are.

  6. #6
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    Quote Originally Posted by JETS 81 DMC View Post
    Great you got it figured out. Been there done that too.
    By polarity you would remove the bulb turn it around so the bulb terminals plug in opposite from where they were.
    Not all LED's are that way but some are.
    That wouldnít work for these bulbs. One terminal is at the bottom of the bulb (Iím guessing thatís positive), and the other terminal is the side casing of the bulb itself.
    DMCF rebuild 2008, Stage II, Eibach

  7. #7
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    Quote Originally Posted by CFI View Post
    That wouldnít work for these bulbs. One terminal is at the bottom of the bulb (Iím guessing thatís positive), and the other terminal is the side casing of the bulb itself.
    You are right. I was not sure what type base they were. Never had mine out. Glad easy fix for ya.

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    Quote Originally Posted by CFI View Post
    Lol I figured it out. I was testing them by turning on the headlights. However, it turns out that the entire electrical system needs to be on. I put the key in the ignition and they all came on.
    Do they come on just when the headlights are on? I think the original set up was for the lights to come on when the car was running. I remember changing mine to come on with the headlights. Don't remember how I did it though.
    Shannon

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    Quote Originally Posted by lazabby View Post
    Do they come on just when the headlights are on? I think the original set up was for the lights to come on when the car was running. I remember changing mine to come on with the headlights. Don't remember how I did it though.
    It's a jumper to replace the light relay. Most people did that because the incandescent bulbs got to hot running all the time. In stock wiring when the running lights were turned on then the HVAC bulbs would dim via a resistor dropping their voltage. But that does not dim if you run LEDs in the HVAC.
    Dave M vin 03572
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    Quote Originally Posted by lazabby View Post
    Do they come on just when the headlights are on? I think the original set up was for the lights to come on when the car was running. I remember changing mine to come on with the headlights. Don't remember how I did it though.
    Mine only come on when the external lights are on. I did this by removing one of the terminals from the ac illumination relay.
    DMCF rebuild 2008, Stage II, Eibach

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