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2010 2011 BMW 5 Series Forum F10 F10 headlight problem, code 800FC8 |
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03-16-2024, 07:07 PM | #1 |
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F10 headlight problem, code 800FC8
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
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2011 535i xDrive Black/Black, Michelin PS AS 4
2014 435i RWD Convertible Service Manual: www.newtis.info Part: http://www.realoem.com |
03-17-2024, 09:50 PM | #2 |
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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.
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03-18-2024, 07:15 PM | #3 |
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Which module did you change, TMS or FRM? Do you need to reprogram?
What symptom did you have?
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2014 435i RWD Convertible Service Manual: www.newtis.info Part: http://www.realoem.com Last edited by TZ; 03-19-2024 at 05:41 PM.. |
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03-31-2024, 08:24 PM | #4 |
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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.
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2011 535i xDrive Black/Black, Michelin PS AS 4
2014 435i RWD Convertible Service Manual: www.newtis.info Part: http://www.realoem.com |
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