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      09-28-2012, 05:32 PM   #1
First Lieutenant
marksae's Avatar

Drives: ///M
Join Date: Jul 2011
Location: Bay Area

iTrader: (5)

E90 LCI Taillight LED's failed

Just thought I'd share what happened on my 2009 E90 M3. Build date is July 2009.

About a month ago, I noticed the bank of turn-signal LEDs on my left taillights flickered whenever I unlocked the doors. Upon closer inspection, 3 out of the ~15 LED's appeared to be really dim compared to the rest. Then I started getting the "left rear turn signal malfunction" message intermittently whenever I used the blinkers.

Anyway, long story short, I brought the car to the dealer and they replaced both Left and Right outer taillights under warranty.

Below is the TSB (SIB-63-06-10) for this issue. According to the TSB, the cause of failure is internal corrosion.
09 E90 AW ///M3 6MT
07 LBP S2K