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+--- Thread: HKFM Module Disappeared - Tailgate - Trailer ECU (/showthread.php?tid=7156)
HKFM Module Disappeared - Tailgate - Trailer ECU - BimmerLeben - 12-02-2024
Hi everyone, good evening.
I've got an aftermarket tow bar fixed on my X3 2017 G01 recently and, after the installation, the tailgate stopped from working properly. It opens normally when I click push the buttons (both internal/external), but the tailgate won't lift/close automatically. Additionally, car's services alerts have all shown up after that, including the pre-delivery check (which is the only one I didn't manage to turn off).
I took it to a BMW shop and their diagnostics were:
"Investigated customer concern. Confirmed concerns. There is no communication to the HKL module, possibly due to aftermarket wiring.
Attempted to program vehicle but was unsuccessful due to aftermarket control module fitted to the vehicle.
Carried out further diagnostics and confirmed vehicle requires trailer control module, BMW trailer wiring harness to bring vehicle back to factory specification. Reset the tail gate module, if still faulty then recommend replacing tail gate module also. Will require programming after control units are replaced."
I tried to reprogram the ECU using E-sys but the HKFM module (or any other related to the tailgate) is simply not showing up, however, others do.
I'm a bit sceptic about the idea of the aftermarket trail module interfering with BMW's, and before running to buy a genuine BMW trailer ECU, I'd like to try it via coding.
I'm trying to find a way to identify if the module has been fried or not. Also, I'm not quite sure yet how to reprogram the module, "brute forcing" a HKFM folder save on it.
Does anyone here would be able to provide a suggestion?
Thank you very much!