[TZ]

Recently, my 2011 F10 535iX has headlight issue. No left turn light, no left halo.

iDrive showed

"Left turn light malfunction"

"Daytime lamp malfunction"

Pull a code of 800FC8, LIN bus headlight driver module(TMS), left, communication fault.

Does anyone have idea?

TIA

[bake]

You need to replace the headlight module. You are likely getting moisture in the headlight and it fouled the module. Very common problem in the F10. I just changed my module 3 weeks ago, PITA to get to.

[TZ]

Which module did you change, TMS or FRM? Do you need to reprogram?
What symptom did you have?

[TZ]

Update:
The fault code was 800FC8, LIN bus headlight driver module(TMS), left, communication fault.
I swapped the left/right headlight assemblies and confirmed the problem followed the left one. I removed the left light model TMS. It looked clean and no suspicious. I measured the wires point to point from headlight connector to TMS connector and found no fault.
Then I cleaned and resealed the headlight assembly. Put it back. Amazingly, it works again! Still not sure what is the root cause. Giving the headlight had condensation before, the only thing I can imagine was moisture and contamination (but I saw none) on the connection points.