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(solved) BMW headlight fault 800FC8 Lin bus
04-01-2017, 17:07 PM, (This post was last modified: 04-01-2017, 17:10 PM by bawareca.)
Post: #11
RE: BMW headlight fault 800FC8 Lin bus
(04-01-2017, 01:20 AM)Loliceman Wrote:  BMW are unfortunately not giving away free FRM's biggrin

No, they dont. Just plugging in a used FRM or a "borrowed" from another car will quickly show if the problem is in the FRM or not.
There is a very big chance the TMS module being wet causing short to ground or sending 12v on the LIN bus and damaging the FRM.
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09-01-2017, 10:26 AM,
Post: #12
XZBMW  RE: BMW headlight fault 800FC8 Lin bus
HI i got the same problem at a 435 alpina, at that car the headlight was faulty. the plastic from the connector inside the headlight was broken the modul get not fully contact. the modul where fitted with the 2 screws outside the headlight and the connector inside was millimeters away from the ecu. sorry for the bad english. hope you can understand what i mean. if not feel free to ask me.

Greetings Frank
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10-01-2017, 01:53 AM,
Post: #13
RE: BMW headlight fault 800FC8 Lin bus
(09-01-2017, 10:26 AM)Maxe4077 Wrote:  HI i got the same problem at a 435 alpina, at that car the headlight was faulty. the plastic from the connector inside the headlight was broken the modul get not fully contact. the modul where fitted with the 2 screws outside the headlight and the connector inside was millimeters away from the ecu. sorry for the bad english. hope you can understand what i mean. if not feel free to ask me.

Greetings Frank


Hi, makes sense, but for me its both headlights also my friend has the same problem with both headlights. For now Im looking for second hand FRM3 module
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04-02-2017, 14:39 PM,
Post: #14
XZBMW  RE: BMW headlight fault 800FC8 Lin bus
Finally solved ! rockrockrock
So that was not a cheap fix, since headlights got some moisture inside my both TMS modules partly broke down and furthermore they effected FRM3 module which was not dead but did not function properly.
To fix fault 800FC8 Lin bus
I had to replace 2xTMS headlight modules and FRM3 (second hand but exactly same part no) also some coding. FRM3 worked without changing vin but some adjustments were needed to make it work properly.
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[+] 2 users say Thank You to chaF10 for this post
03-04-2017, 23:26 PM,
Post: #15
RE: (solved) BMW headlight fault 800FC8 Lin bus
800fc8 ,800fc9 lin bus no comunication to tms left and right problem solved, replaced the frm3 a used one ,just make sure you get the exact seime serial number thans one your original frm thanks ChaF10
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