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Thread: LED dome light relay

  1. #11
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by jawn101 View Post
    Very cool. One or both dome lights? Any action required on the trunk/engine bay courtesy lights?
    I only did my front dome light. As long a one of the lights has with the resistor is on that will be all you need. But say both doors are closed and your in battery save mode, than you would need one on the trunk or engine light if that was was on.

    Again, in power save mode, all your seeing is 200 ua. of current which is enough to give you a dim glow from LEDs. Adding the resistor will not change any power consumption but will reduce that 200 ua. through the LEDs below the threshold voltage of the LEDs.

    On my car with the one resistor on the dome light, I don't see any glow on the door lights when only that door is left open after power save mode is entered.

    So I suggest you just do the dome light resistor and then add resistors after testing if you need them.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  2. #12
    My friends think I'm nuts jawn101's Avatar
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    Quote Originally Posted by Bitsyncmaster View Post
    I only did my front dome light. As long a one of the lights has with the resistor is on that will be all you need. But say both doors are closed and your in battery save mode, than you would need one on the trunk or engine light if that was was on.

    Again, in power save mode, all your seeing is 200 ua. of current which is enough to give you a dim glow from LEDs. Adding the resistor will not change any power consumption but will reduce that 200 ua. through the LEDs below the threshold voltage of the LEDs.

    On my car with the one resistor on the dome light, I don't see any glow on the door lights when only that door is left open after power save mode is entered.

    So I suggest you just do the dome light resistor and then add resistors after testing if you need them.
    Sounds like a plan
    Jon
    1981 DMC-12 #02100. July 1981. 5-speed, black, grooved w/flap.
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  3. #13
    Senior Member QuadcityDMC's Avatar
    Join Date:  May 2011

    Location:  Moline,IL

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    Need help, what position is dome light auto position.

    My program lasted 1 day again. With all doors closed I open glove box but can not get in to program mode. Open my door and I'm in parade mode.

    I'm rechecking my installation from a year ago.

  4. #14
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

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    Quote Originally Posted by QuadcityDMC View Post
    Need help, what position is dome light auto position.

    My program lasted 1 day again. With all doors closed I open glove box but can not get in to program mode. Open my door and I'm in parade mode.

    I'm rechecking my installation from a year ago.
    Normally back is the auto position but you can stick in or wires differently to make forward auto. Pretty easy to find, close the doors and wait for the dome lights to go out. If they don't go off then it's in on position.

    You did say it was working fine with incandescent bulbs?
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #15
    Senior Member QuadcityDMC's Avatar
    Join Date:  May 2011

    Location:  Moline,IL

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    My VIN:    3390

    When I got the car the door light where led and dome where bulbs. The white relay was missing and there was a black relay in its spot. I bought the upgrade relay and placed LEDs in the domes, wired it up and it has been working "good" for the last year, no it seems every other day it loses it's program.

    I'm going to try and reprogram again later to day.

    Could you reprogram you chip in the relay to just be mode 1?

    Thanks for all the help

  6. #16
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    Quote Originally Posted by QuadcityDMC View Post
    When I got the car the door light where led and dome where bulbs. The white relay was missing and there was a black relay in its spot. I bought the upgrade relay and placed LEDs in the domes, wired it up and it has been working "good" for the last year, no it seems every other day it loses it's program.

    I'm going to try and reprogram again later to day.

    Could you reprogram you chip in the relay to just be mode 1?

    Thanks for all the help
    I still think putting a resistor on one dome light will fix it. Yes I could make a software change in a unit to keep it on mode 1 but after it's sealed up it could not be changed again. If you need some resistors, I can send you some in mail.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  7. #17
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    My VIN:    03572

    Instrution change

    Instruction change.

    note: the new caution statement. I want to keep supplying these units so please verify your circuit is fused.

    3) Now to get power to the module and interrupt the dome light power you install the new red wire with the crimped terminal into the white socket pin #87a. Install the new blue wire with the crimped terminal into the white socket pin #85. Tie wrap these new wires into the harness under the sockets to prevent pulling the wires too short for the next step. Route these new wires along the existing wire bundle and exit out the right side of the fuse block. Cut the purple wire in the large bundle on the right side of the fuse block (this wire comes from fuse #12). Note that there are some other purple wires in this area (see Figure 4.), confirm by a minor tug, that the purple wire you are about to cut goes to fuse #12. Attach the new red wire to the cut purple wire that goes to the fuse. Attach the new blue wire to the cut purple wire that goes into the large bundle on the right side of the fuse block.

    Caution:
    If you connect to the wrong purple wire you will blow the dome unit. I can tell you have done this when I ask for your unit to be returned. I will not warranty the unit for this failure. As a precaution, you can test you have wired correctly by short circuit the pin 87a to ground and it should blow fuse #12.
    Dave M vin 03572
    http://dm-eng.weebly.com/

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