It could be a short on the wiring or a problem with the LCM. You can check for a short by unpluging the connector at the back of the LCM and ringing the pin out to earth. There are no fuses in the circuit, if tut LCM detects a short it powers down that circuit. It would be useful if it indicated that it had detected a short when it did this but it doesn't. You can check the LCM is operating correctly by checking the pin out,on the socket with a meter. The most likely cause is a short on the wiring. I had this on my headlight. If it is the LCM they are not cheap and are coded to the car and only new ones can be fitted which are encoded.
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