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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 02-08-2006, 03:33 PM   #1
CurE
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Corner Delete Mod.

How do i go about hooking up the corner lights to the side markers so that the corner lights only come on when i use the indicator...
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Old 02-08-2006, 04:31 PM   #2
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Rule #1: Search before you post.
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Old 02-08-2006, 04:39 PM   #3
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Searched because I wanted to know as well and found this

http://forum.e46fanatics.com/showthread.php?t=267800
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Old 02-09-2006, 10:04 AM   #4
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Beware though a few people who've done this have ended up with a bad LCM cause of the side marker needing more power or something.
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Old 02-09-2006, 03:47 PM   #5
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Originally Posted by bimmer07
Beware though a few people who've done this have ended up with a bad LCM cause of the side marker needing more power or something.
If you want to be safe, use a relay on the corner light to be "clicked" by the side light power. Don't forget to add a diode on the relay contacts to eliminate feedback when the relay is "released" (the surge could damage the LCM). The diode should be connected "backwards" on the relay contacts (line side goes to contact getting a positive signal.) You can get power for the relay from either the corner light, or another 12v source. This can also probably be done with a transistor.
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Old 02-09-2006, 07:22 PM   #6
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And this thread: http://forum.e46fanatics.com/showthr...=278132&page=3. Read nearer the end where it discusses LCM failures and the associated costs. Plus there's the heat issues with the resistors.

The ONLY way this should be done is as ca1242 described. Personally I wouldn't recommend it period, but hey it's your car.

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Old 02-09-2006, 07:50 PM   #7
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uhh couldnt you just put a resistor where the front turn bulb would be and problem is solved
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Old 02-09-2006, 09:01 PM   #8
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Or you could use LED turn signals since they draw less current than the OEM bulbs, this would further reduce the chance of LCM failures..
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Old 02-09-2006, 09:09 PM   #9
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uhh couldnt you just put a resistor where the front turn bulb would be and problem is solved
You've lost me...how is this going to solve the problem of LCM output channel overloading??

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Old 02-11-2006, 03:51 PM   #10
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i know of 1 person who had a problem, and hes the one that told everyone that ur LCM willgo bad.. thats bs in my opinion
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Old 02-11-2006, 08:07 PM   #11
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i know of 1 person who had a problem, and hes the one that told everyone that ur LCM willgo bad.. thats bs in my opinion
It is more than 1, it is at least a couple that I've read about. And from an electical design standpoint, it is NOT BS. You are asking an unfused transistor controlled circuit to produce and sustain a 26 watt output (front and side marker combined) when it is only designed to provide 5 watts (side marker only). It is like overloading as house plug circuit 5 times over.

If you don't want to listen to the warnings, go nuts and install this mod, can't say no-one here warned you. These warnings aren't just opinions. And I wouldn't be willing to risk to assume the known failures were random unrelated issues, especially considering the price of an LCM.

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Old 02-11-2006, 11:27 PM   #12
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I've had it installed for almost a year now, and I've had no problems. If you really want to be safe, use LED bulbs in your corners...
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Old 02-12-2006, 11:23 AM   #13
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I've had it installed for almost a year now, and I've had no problems. If you really want to be safe, use LED bulbs in your corners...
Good idea.

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Old 02-13-2006, 04:03 AM   #14
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i bought another bulb and use this bulb as a "resistor" and wrapped it with aluminum foil. hooked up the signal light to the side indicator, seems to do the job well after 6months+
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Old 02-14-2006, 06:43 PM   #15
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I've had it installed for almost a year now, and I've had no problems. If you really want to be safe, use LED bulbs in your corners...
i have LED corners, it could be different my bad
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Old 02-15-2006, 11:02 AM   #16
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thanks for all the help...
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Old 02-15-2006, 11:20 AM   #17
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Quote:
Originally Posted by ca1242
If you want to be safe, use a relay on the corner light to be "clicked" by the side light power. Don't forget to add a diode on the relay contacts to eliminate feedback when the relay is "released" (the surge could damage the LCM). The diode should be connected "backwards" on the relay contacts (line side goes to contact getting a positive signal.) You can get power for the relay from either the corner light, or another 12v source. This can also probably be done with a transistor.
Could you list out the parts you would suggest to do it this way? I was thinking along the same lines but don't know what parts to use.

Thanks,
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Old 02-15-2006, 12:43 PM   #18
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To do it this way, you would need a relay and diode on each side. You can buy the parts at radio shack. Use a normal 1-amp recifier diode and an "automotive" type relay (single pole, single throw). This is not the most elegant way of doing it, but it would definitely work.

Probably the best option is, as suggested to use LED corner light bulbs and do the mod as everyone else does it. Since the LEDs draw so little current, it won't cause problems.

If you are using light bulbs, you could also do it with transistors. No mechanical components to go bad (such as a relay). Just needs a little engineering design to figure out which parts to use.
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Old 02-15-2006, 01:05 PM   #19
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I thought even with LEDs there was still a potential problem because the front signal bulbs use 21 watts vs the 5 watts for the side markers. So even with no load from the LEDs that is 16 watts more load that the circuit should have on it.

How would you wire the transistors?

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Old 02-15-2006, 01:20 PM   #20
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Originally Posted by tim330i
I thought even with LEDs there was still a potential problem because the front signal bulbs use 21 watts vs the 5 watts for the side markers. So even with no load from the LEDs that is 16 watts more load that the circuit should have on it.

How would you wire the transistors?

Tim
I think the idea is to use LEDs in the front corners, eliminating the 21 watt extra load of the regular front corner bulbs on the side marker circuits. It would only add maybe 1 watt or so.

This may be repeating the obvious, but something that gets confused here is there really are two "mods" being done. One is moving the front corner bulbs to the side marker circuit to change the lighting configuration (removing the parking light feature), the other mod is adding the resistors to the front circuits that the front corner bulbs used to be connected to. The resistors are only there to remove the "bulb out" warning - that step could be skipped but you'd have bulb-out warnings on the dash. All that said, the overload issue is with the "bulb" circuit not the "resistor" circuit.

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