E46Fanatics - View Single Post - OEM LED tailights and using resistors
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Old 01-14-2013, 07:13 PM   #6
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Join Date: Feb 2008
Location: Philadelphia
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My Ride: M3 & ZHP
Originally Posted by jfoj View Post
Just get BMW Scanner 1.4.0 for $32 and code the cold/warm check to off, this is what they do on the cars with factory LED's.
Not exactly. The cold/warm checks are disabled, but the other difference is that the LEDs are controlled via PWM rather than simply sending a lower voltage. If you look at a car with factory LEDs or properly retrofitted LEDs and compared it with one that uses resistors or simply disabled cold/warm checks, you'll notice the latter has a slight flicker.

The best way to do an LED retrofit is to add "+LEDH" to your vehicle order and then recode the LSZ with a blank FSW_PSW.MAN. The +LEDH in the vehicle order will tell the system to code the car for an LED retrofit.
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