Cheap trick to installing LEDs without issues!




Between my two W211's and a W209, I've tried all the canbus, resistor, regular LED combinations, until it hit me a few days ago working on my E500....why not add a factory bulb in parallel to the LED. That way you know for SURE that it'll trick the computer...no need to worry about resistor ohms, wattage, etc.
For the interior, I added one 194 bulb in the whole series for the footwell lights. I bent the 194 bulb wires, slipped them onto the connections under the drivers feet. If you bend the bulb back over the connector, there is a lot of empty space under the dash so the bulb has a ton of free space around it and it wont be close to touching anything.
Its been working PERFECT for nearly a week now. The LEDs I am using are the regular (not canbus) cheap-o Hong Kong imports from eBay. Not a single flash, bulb-out or anything, and it cost me 30 seconds of work! Its reversible in the same amount time. I have the ambient mode, full brightness with doors open, no flashing and they shut off with the other lights just as they should.
See picture below for a visual.
I know that people have had issues with doing the trunk LEDs as one would always flash, so I will try this method in the trunk as well and report back. I am almost certain that it will work like a charm. I'll report back.
NOTE: Try this at your own risk. I highly advise making sure that the bulbs will have enough space to cool properly and that they don't touch other wires, etc. I assume no liability for any issues anyone may experience attempting this.




I put the 194's on both sides and folded them forward toward the LED bulb that way they sit nicely in that indent away from everything.
Its been 2 hours and i opened the trunk quite a few times to test them, and not one flicker.




Let me know how it goes!




All my interior bulbs are regular LEDs, no canbus/error-free b/s.
For the dome and doors, didnt even need to add anything. Just plain old LEDs work 100% fine.
The only concern (if its a concern for you) the under the door bulbs are slightly illuminated as soon as you put the key in but go off wirh key off. I had it this way for a while then when i was bored attampted to correcr and that i solved with a 1W-1000ohm resistor from radioshack. It works like factory and the 1000ohm resistor stays very cool. Barely warm to touch after 3-5mins
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