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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 06-19-2010, 01:00 AM   #1
Registered User
Join Date: Nov 2009
Location: Whitby, Ontario
Posts: 669
My Ride: 2009 335Xi Sedan
Send a message via MSN to Nachos23
Lightbulb Any Electronics designers want to assist in a VERY cool mod?

Some of you may have seen my previous posts in regards to retro fitting a DCT shifter from a 2010 650i to my Steptonic e46. http://forum.e46fanatics.com/showthr...381&highlight=

With my black interior, and black CF trim, should look sweet! Not my car; someone that tried and almost got it there......

BMW's current lighting system on the e46 uses a common power, switched ground design. PRND LEDs are lit when the selector switch closes the circuit to ground.....

See schematic below.

The challenge is that the DCT shifter uses a common ground, switched power design to illiuminate PRND LEDs. I've traced and determined the pin connections for the DCT shifter and got ambient lighting on the shifter to operate through car dash lights. Got green LEDs to illuminate by applying Dimmer power directly to applicable pin and varying intensity (best appearnce @ around 6vdc; don't know spec of LED installed).

Where everybody previously had failed is getting it to operate in the car.

The circuit I have in mind would use the switched ground connections of the current design to trigger a micro relay or opto coupler which in turn would provide approx 6vdc to the LEDs (drop voltage across resistor). Replicate circuit 5 times PRND and M/S. Simple design and I am an electrical engineer by trade, but been out of industry for close to 20yrs and sorta behind on mre technology available to me. Spent evening browsing Electrosonic catalogue and think I've got the relay identified....

Just need some assistance in fine tuning and double checking to ensure the components selected are appropriate for application.

Just a little of your time to help make this work........ Any takers?
My Rides:
2009 335i Xdrive

2000 Z3M Roadster

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diy, e46, electronics, retrofit, shofter

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