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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > "Check trailer lights" on dash, but no trailer attached



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      09-06-2017, 03:36 PM   #1
Wahnsinn
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"Check trailer lights" on dash, but no trailer attached

I have a light on my dash saying: „check trailer lights“ (CC-7), but I have no trailer attached. The car is an E91 325 2005 with the hidden hitch (S3AC). The light pops up, when I switch on the lights. The indictors blinking frequency rises sharply after two blinks as if one indicator was faulty.

I have read the error memory of the AHM module and the information memory using INPA. The error memory is empty and the information memory says that all trailer lights malfunction. (Error Codes: Fehler 9401 AHM,9405 AHM, 9400 AHM, 9403 AHM.)

The issue occurred for the first time after pulling a trailer for 200km.
Any ideas how to fix this? Can anyone help?
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      10-22-2021, 04:06 PM   #2
torbmw
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Did you ever figure out the cause of this problem? I have the same issue on my 2006 330i.
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      10-22-2021, 04:42 PM   #3
Andystobbs
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Check for water ingress at AHM
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