2013 Bmw 750 F01 Left Turn Signal Malfunction

Kary Owner/Technician Maryland Posted   Latest  
Unsolved
Electrical
2013 BMW 750i 4.4L (N63B44B) 8-spd (GA8HP70Z)
Left Turn Signal Malfunction

CODE 805CF8. Here's the issue with LH turn signal malfunction on 2013 750i LED adaptive headlight. New tms driver module has been replaced and coded the turn signal worked. Autel Maxisys Elite with j box was used for this. Then I inadvertently pressed programming the turn signal stopped working. Tried to reinitialize the headlight then teach in led. Turn signal led would flash once then the teach in process aborted with error in tms. No go after multiple tries. Then I replaced the led module and turn signal module. Still the same result. Then I tried esys and insta-p as I attached some screenshots below. Dont mind the error code on front left camera it is the corroded wiring that needs to be replaced. Also other hint is built in led on lh headlight is slightly dimmer than rh headlight. 

I admit I am not well versed in bmw electrical. STML<ZGW its all spaghetti. I need some idea where to look or have you remote (teamviewer capability) into my Autel Maxisys Elite hooked with j box to go back to the beginning where I inadvertently “bricked” the headlight. Or it is something insta p or autologic can do. Any help would be greatly appreciated. 

0
Louie Technician
New York
Louie
 

Try swapping the headlight driver modules from left to right if it now works swap it back​.​if it doesn’t work again just replace module again

+1
Ð Awarded
Agree
Kary Owner/Technician
Maryland
Kary
 

What they say keep it simple lol. Im just overthinking if ecm needs relearn to link to the stml after i got a code on flexray not being calibrated. Definitely planning to do drive module swap and testing. Dealer say lear module is 5 to 6 weeks out if ordered.

0
Ð Awarded
Kary Owner/Technician
Maryland
Kary
 

Circling back to this. It turned out that it was a hardware issue after of all. Some wiring shorted out inside the headlight that caused irregular volt relaying to the tms module preventing from being initialized during the teach in. Me and two other bmw specialists were stumped trying to diagnose this. The defective headlight turn signal flashed once during the teach-in initialization then…

0
Ð Awarded