[crosis]

Vehicle: 2011 BMW X3 (F25) x35i

The right rear tail lamp (the led bar) is not lighting; it is the inner lamp not the one on the tailgate. The turn signal light works. The brake light works. I've already replaced the LED control board with a new Mean Well LDD-500L led driver.

Referencing the photo below I applied 12v battery power to the 2 gold leads. Nothing. I checked voltage from the very thin black / gray wire (located at right) and the very thin pink / red wire (located at right); attaching my multimeter + and - leads to those to locations on the driver produced 12.1 volts. It appears to be passing power from the Vin side to the Vout side.

Could my issue be a bad fuse which controls JUST the led bar within the right rear tail lamp? Sounds unlikely but i'm all out of ideas. I have to assume the led light died. And for the record i cant make any sense of the heiroglyphs of the BMW fuse chart or wrap my head around why there is a fuse box within my glovebox and another in my trunk.

Thanks for any tips

[Commerce]

I had the same thing happen with 3/4 rear LEDs, the turn signal and brake lights would work but the LED bars would not. I purchased a new set of identical LED drivers from eBay and it was a simple plug and play.

Is this the only tail light you have tried to fix? The issue could be related to the Mean Well or soldering.

[crosis]

Thanks for the reply.

This is my first go at replacing the led driver. I ordered 4 led drivers (Mean Well LDD 500-L) and replaced the right tailgate light. It worked fine. But my second attempt, this rear side light, has failed.

I will try desoldering and doing it all again to see what happens.

Is there any chance the led tubes could be toast?

Thanks.

[nonot]

https://www.bimmerpost.com/forums/sh...php?p=22358308

[Commerce]

Originally Posted by crosis

Thanks for the reply.

This is my first go at replacing the led driver. I ordered 4 led drivers (Mean Well LDD 500-L) and replaced the right tailgate light. It worked fine. But my second attempt, this rear side light, has failed.

I will try desoldering and doing it all again to see what happens.

Is there any chance the led tubes could be toast?

Thanks.

I'm doubtful that would be the case but the best way to test this would be connecting a driver/board that you know works.

[neelkc12]

Is there a fuse for left turn signal. Just like OP by rear left module went bust. I followed exactly what I done before -replace the board witha LDL driver - tested the module by attaching to my right - tests fine. But when connected to the original left connector - no lights at all . Dash chirping at high rate - same for a gone bulb.

[Rounde1Head]

looks like LED tail is dead. I had the same thing. In the left part, replacing the board helped. In the right after a while, no. I had to change it completely

[neelkc12]

After fixing up the rear tail light - It still did not work - I had to go to the dealer. -
The fix was the hardness - BMW replaced it @170(inspection)+370
My eye could not tell - apparently harness connectors was corroded.

Originally Posted by neelkc12

Is there a fuse for left turn signal. Just like OP by rear left module went bust. I followed exactly what I done before -replace the board witha LDL driver - tested the module by attaching to my right - tests fine. But when connected to the original left connector - no lights at all . Dash chirping at high rate - same for a gone bulb.

[Kbern55]

I have had 2 of 4 go bad. The Valeo circuit board went bad and simple replacement fixed the issue. bought a 4 pack from Amazon and set up for when the others failed.

[jonmon6691]

Originally Posted by Kbern55

I have had 2 of 4 go bad. The Valeo circuit board went bad and simple replacement fixed the issue. bought a 4 pack from Amazon and set up for when the others failed.

Careful with those amazon replacements... They have a tendency to basically be radio jammers and cause comfort access to stop working, FM radio reception to go to shit, and TPMS to throw faults. I bought my car with all those problems and they all went away after I got rid of those amazon circuit boards.