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Thread: E34 LKM mod for HID/LED. Fix Bulb Failure Warning

  1. #51
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    Quote Originally Posted by sse34 View Post
    These don't catch on fire like ddm's

    But to each his own
    I didn't mean to put off your idea. Yes, I have heard of DMM's "exploding" due to their reverse polarity. The ones that I got from them don't seem as nice as the ones you link. I might go with those after all..

    '89 535i/5 Holset WH1E turbo
    Follow my m106 megasquirt build thread here
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  2. #52
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    Quote Originally Posted by 95///M3 View Post
    Mine looks different... Any schematics available for this version ??

    To update this thread, I just defeated the parking light warning and low-beam on this LKM-L US (91 M5), with some help from the Japanese DIY site.

    The two chips say TC4021BP, which in the pic above are the two chips to the top and right (the ones that are folding down).



    Compare to this pic below, and you'll see that chip A is on the left, chip B is on the right. I ground 14 to 8 for the parking, 1 to 8 for low beam.


  3. #53
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    '97 540i Dinan, 98 740iL
    My E38 and E39 both have aftermarket HID low beams installed... Does anyone know what maximum value of resistance will keep the error message from showing up and minimize wasted power dissipated in the load resistor?

    Those "error eliminators" are 6 ohms, which at 12 volts is 2 amps, and will waste 24 watts each! Does it really take 2+ amps draw to set the AD2201 comparator output?
    '98 740iL E38 201k, TCG at 190k, 5HP24 at 195k
    '97 540i/6 E39 Dinan blower & stage 1 suspension 114k
    '93 525i E34 "Golf Ball" (hail damaged) 334k

  4. #54
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    hey guys. all my research points back to this thread on how to get this mod done, but the pictures from the diy are long gone. i was able to figure out which chips need the modification from the discussion, but with no pictures i cant tell which pin is #1 and which is #8. did anyone save these? thanks!

  5. #55
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    Look closely at the IC's... there is either a small "notch" on one end of the package, or a dot next to pin 1.

    Pins are numbered counterclockwise like this, looking at the top of the package, not the solder side:

    16 15 14 13 12 11 10 09
    >
    01 02 03 04 05 06 07 08

    Hope that helps.
    '98 740iL E38 201k, TCG at 190k, 5HP24 at 195k
    '97 540i/6 E39 Dinan blower & stage 1 suspension 114k
    '93 525i E34 "Golf Ball" (hail damaged) 334k

  6. #56
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    DrCharles, thank you thats what I needed. Do me one last favor and check my work to make sure it matches what the OP intended.





    Quote Originally Posted by DrCharles View Post
    Look closely at the IC's... there is either a small "notch" on one end of the package, or a dot next to pin 1.

    Pins are numbered counterclockwise like this, looking at the top of the package, not the solder side:

    16 15 14 13 12 11 10 09
    >
    01 02 03 04 05 06 07 08

    Hope that helps.

  7. #57
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    2016 640i, 1990 535iM
    i may have to do this some time this week. i hate having errors on an error free car...

    - - - Updated - - -

    wheres a good place to get them pcb blaster. hope they are cheap
    2016 640i Coupe'
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    1999 740iL: Sold
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    IG- @Rogetta_Stone

  8. #58
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    Tinypics of toyotahachiroku's first post do not work anymore. If someone downloaded them, please upload them again, thanks
    Shogun tricks and tips for the E32 series are HERE!

  9. #59
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    Quote Originally Posted by straight6pwr View Post
    DrCharles, thank you thats what I needed. Do me one last favor and check my work to make sure it matches what the OP intended.

    I installed HID's a while back and was looking for a way to fix only the low beam error. Though not the original pictures, this picture helped me out a ton. This is for LKM-L (61.35-8 350 377), US spec. The pin-out for each IC is indeed correct HOWEVER the labeling of chip A & B are incorrect. Chip A is low beam lights (dip beams) and Chip B is fog lights.

  10. #60
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    Quote Originally Posted by juhony View Post
    I installed HID's a while back and was looking for a way to fix only the low beam error. Though not the original pictures, this picture helped me out a ton. This is for LKM-L (61.35-8 350 377), US spec. The pin-out for each IC is indeed correct HOWEVER the labeling of chip A & B are incorrect. Chip A is low beam lights (dip beams) and Chip B is fog lights.
    you are correct. I performed the mod just a couple weeks ago and found the same thing. (forgot to come here and update.)

  11. #61
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    Here a Japanese language info with pics http://dd.jpn.org/BMW_HP/20040911/index.shtml
    including schematic circuit diagram drawing http://dd.jpn.org/BMW_HP/20040911/LKM376.pdf
    Shogun tricks and tips for the E32 series are HERE!

  12. #62
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    1995 bmw 540i
    Quote Originally Posted by straight6pwr View Post
    you are correct. I performed the mod just a couple weeks ago and found the same thing. (forgot to come here and update.)
    Hello,

    Thanks for the info on the Low Beam and Fog light warning cancel mod. I wanted to share my findings on the Fog lights with High beam mod.
    I'll admit, I was pretty stressed about playing around with the LKM, but I'm so happy it worked out. (so far)
    I used a Butane touch soldering iron which was great. One quick touch - done with solder.
    My Fogs are now driving beams as I changed my lenses to clears. Now the hot spot is centered instead of dispersed. Bi-xenon is next, but I
    won't get into details here.

    my jumper wires:
    IMG_9807.jpg

    Fog Jumper is from Pin 24 (Ground with blue mark) to a pin on the Fog relay. see pics below...
    Found the Ground via Bentley Manual and this forum.
    IMG_9809.jpg

    the diagram from the original poster with my updates. I found the high beam trigger pin on the fog light relay by accident when using a test light on each pin.
    I confirmed my LKM part# LKM USA-L 61.35-8 350 377


    bmw_lowbeam_fog_cancel.jpg

    The money shot:

    IMG_9819.jpg

    thanks and enjoy!

    scott
    Attached Images Attached Images
    Last edited by scott540i; 02-11-2018 at 06:31 PM.

  13. #63
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    BMW 325is Turbocharged - Jeep Cherokee 4.6L Stroke
    Wish the OP's pictures could be online to check the details as mine is a euro LKM. I recently installed HID in th elow and LED for high and as well LED for the fogs. All sort of bulb messages in my cluster is driving me nuts.
    Euro M3'87 NogaroSilver/Euro E34 M5 '93/Porsche 993 TT 97' Euro/Porsche 993 Carrera 95' Euro/Skyline R33 GT-R


  14. #64
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    The only difference between US and EURO is that the EURO has one relay more for rear foglights. Newest LKM mod is in the DIY section https://www.bimmerforums.com/forum/s...3#post29998123
    Shogun tricks and tips for the E32 series are HERE!

  15. #65
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    1994 E34 520 1996 E36320
    My E34 has HID set up for driving lights and low beam no issues bmw 520 - Copy.jpg H1 55w 6000k all i did was cut the wires and soldered the joint to the HID cable with some shrink tube to seal it,three years with no issues.

  16. #66
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    The older version HID conversion kits from China were all specified as 35W, that probably causes the light warning sometimes.
    Nowadays the offers on the bay show a selection of H1 35W or H1 55W, so with the 55W ballaster version there might be no light warning. But one of my wrenching buddies tested one 55W as sample, it had roughly 40-45W only, maybe the brand(?).

    Here is the latest write up on warning delete https://www.bimmerforums.com/forum/s...3#post29998123
    Shogun tricks and tips for the E32 series are HERE!

  17. #67
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    1994 E34 520 1996 E36320
    They now have H1 75w and 100w ballasts with bulbs for as little as $80 AUD though i have ordered 300w H1 6000k LED COB lights for high beam as these have cooling fans built into the aluminium casing ,i have not tested the light output though being China and cheap, you get what you pay for i am surprised i have got three years as the kit was only $40 AUD back then shogun.

  18. #68
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    does anyone sell a modified LCM for a 95 525i that will work with LEDS? I want to change my brake, turn signals, backup and taillights. Thanks
    Last edited by Russellc; 04-10-2023 at 09:56 PM.
    Thanks,
    Russell


    1995 BMW 525iA, M50TU, build date 1/95, Oxford Green/Parchment/leather/wood, EAT chip, Continental CD head unit, ASC+t, heated seats, lumbar support, HID & premium package abt 243k miles, rebuilt trany

  19. #69
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    Quote Originally Posted by Russellc View Post
    does anyone sell a modified LCM for a 95 525i that will work with LEDS? I want to change my brake, turn signals, backup and taillights. Thanks
    I've already asked and it seems nobody is willing to do it even for money. It sucks because you have to know what you're doing already or the pictures won't make any sense whatsoever

  20. #70
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    Quote Originally Posted by Russellc View Post
    does anyone sell a modified LCM for a 95 525i that will work with LEDS? I want to change my brake, turn signals, backup and taillights. Thanks
    I did some research and reverse engineering a decade ago, for free; information was posted for all on how to disable certain monitoring chips. The spec sheets for the AD123-whatever chips are available, you can reverse engineer and follow the breadcrumbs. Or you can bolt on expensive resistors and/or dump a bunch of money on things that will either generate a lot of heat, or simply not work. "CANBUS-free" LEDs are a joke, they can't possibly intercept "CANBUS" communications between modules and/or trick all different vendors of bulb monitoring systems, particularly when the LKM is sending a bitstream of warnings to the check control module.

    Quote Originally Posted by Broombroom View Post
    I've already asked and it seems nobody is willing to do it even for money. It sucks because you have to know what you're doing already or the pictures won't make any sense whatsoever
    Yes, and these bulb monitoring systems were designed to monitor bad bulbs that a) drew too much current (shorted wiring, aka hot testing) b) didn't pull enough current (wrong bulb/ bad bulb). Information is all available if you really wanted; I could certainly try and modify your LKM for you, but I'd probably charge $200+ for my time dig out my notes and to short out the ~6 pins needed to disable the monitoring that keeps folks safe.

    '89 735i, '91 850i, '81 MB 380SLC (For Sale), Tesla Model 3, and VW Passat TDI -- Yes, I still repair General Modules, DM for info!

  21. #71
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    one more link -LKM-Modification-For-LED-Exterior-Lighting https://www.bimmerforums.com/forum/s...erior-Lighting
    Shogun tricks and tips for the E32 series are HERE!

  22. #72
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    Two more--

    https://www.bimmerforums.com/forum/s...ion-of-the-LKM

    This one detailed disabling alert for the running HID/LEDs in the low beams, and glossed over the fact that the other AD22xxx chips managed different circuits
    https://www.bimmerforums.com/forum/s...-for-Early-LKM

    '89 735i, '91 850i, '81 MB 380SLC (For Sale), Tesla Model 3, and VW Passat TDI -- Yes, I still repair General Modules, DM for info!

  23. #73
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    Quote Originally Posted by Broombroom View Post
    I've already asked and it seems nobody is willing to do it even for money. It sucks because you have to know what you're doing already or the pictures won't make any sense whatsoever
    Thanks. that's a shame as i just wanted my tail lights, brake lights to be brighter. I found the rear turn signals, backup lights and the small side marker lights do not have bulb out warning so I have upgraded them to much brighter lights.
    Thanks,
    Russell


    1995 BMW 525iA, M50TU, build date 1/95, Oxford Green/Parchment/leather/wood, EAT chip, Continental CD head unit, ASC+t, heated seats, lumbar support, HID & premium package abt 243k miles, rebuilt trany

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