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Weird LED map/dome light issue

Discussion in '1st Gen. Tacomas (1995-2004)' started by Seagull233, Jun 3, 2017.

Page 2 of 2
  1. Jun 11, 2017 at 10:25 AM
    #21
    treyus30

    #21
    treyus30 70% complete 70% of the time

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    I mean bypass in the same way the resistors are. Replace the resistors in the photo above with wires.

    Perhaps my understanding from this thread about the wiring of your lights is incomplete. Are you not wiring like this?
    12v battery > Led > resistor(s) > on/off switch > ground
     
    Last edited: Jun 11, 2017
    treyus30, Jun 11, 2017
    #21
  2. Jun 11, 2017 at 4:34 PM
    #22
    frizzman

    #22
    frizzman Well-Known Member

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    the resistors are on the bulb itself. they are actually a festoon type (3175 I think) with a flat 3x3 LED and the resistor is added to the back of the bulb.
     
    frizzman, Jun 11, 2017
    #22
  3. Jun 11, 2017 at 7:53 PM
    #23
    Seagull233

    #23
    Seagull233 [OP] Well-Known Member

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    Unfortunately, these lights are anything but straightforward. They work through a control module. The dome light has a courtesy function, whereby, when unlocking the door with the remote, it automatically lights the dome light. It also has a delay off following closing the doors, as well as when you lock the door. It seems that the control module must sense resistance at the bulb in order to function properly. Because the LED bulb draws so little current the module does not perform as intended. By adding the resistor to the bulb, the additional draw satisfies the needs of the module, and it works the same as with an incandescent bulb.

    I ran into this same scenario when adding LED headlights. The LED headlights worked fine, but I no longer had a high beam indicator on the dash. If you only replaced one incandescent, the indicator worked fine. Rather than purchasing resistors, I merely grafted a second socket into the wiring, and placed an incandescent bulb in the extra socket. It just lives in a 6 ounce tomato juice can tucked out into the cavity of the fender. (didn't want any weird lights under the hood).
     
    Seagull233, Jun 11, 2017
    #23
  4. Jun 12, 2017 at 4:09 PM
    #24
    treyus30

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    treyus30 70% complete 70% of the time

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    Oooohhkkay. Gotcha. The resistors are in Parallel then, not series.
     
    Last edited: Jun 12, 2017
    treyus30, Jun 12, 2017
    #24
  5. Jul 7, 2018 at 5:30 PM
    #25
    Buckaroo1993

    #25
    Buckaroo1993 Who?? ME??

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    Reviving this thread...

    Does this mean all I need to do is solder a 1W 100 Ohm resistor end-to-end across the back of the LED dome light? (And map lights if they start acting up?)
     
    Buckaroo1993, Jul 7, 2018
    #25
  6. Jul 7, 2018 at 5:33 PM
    #26
    jrallan26

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    jrallan26 Well-Known Member

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    I didn’t need one. Just plugged in.
     
    jrallan26, Jul 7, 2018
    #26
  7. Jul 7, 2018 at 5:35 PM
    #27
    Buckaroo1993

    #27
    Buckaroo1993 Who?? ME??

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    Unfortunately I do. Door-open dome light only works with ignition switch to Acc or On.
     
    Buckaroo1993, Jul 7, 2018
    #27
  8. Jul 7, 2018 at 9:07 PM
    #28
    Seagull233

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    Seagull233 [OP] Well-Known Member

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    Yes, just solder the resistor to the ends of the bulb. Use for the dome, and it fixes the map lights as well. (Did for me anyway!!)
     
    Seagull233, Jul 7, 2018
    #28
Page 2 of 2

Products Discussed in

uxcell 10PCS 100 Ohm 1W Resistance Fixed Metal Oxide Film Resistors Blue
$9.24
Marsauto DE3175 31mm LED Interior Dome Light Map Bulb Door Courtesy for Car 1.22" DE3021 DE3022 Festoon Bulbs White Pack of 4
$8.99
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