Auto lights or wipers doing what they want? Alarm going off randomly? Here's a fix..
As the title; My alarm started to go off randomly for a couple of nights, then stopped, then started again. It got to the point where I couldn't lock my car.. Diagnostics was showing a faulty BCM but as I needed the car, taking it out and sending it off for repair wasn't an option.. It then it cured its self.
Fast forward a month and it was doing the same again but with the autolights coming on and off sporadically in the daylight, and the auto wipers doing the same.
Now, four CAN wires that are tucked away in the main loom are held together, from factory, by tape. These come apart/corroded and create the issues mentioned above.
Simply remove the seat, and the module housing underneath (leave the cables attached to the module), pull back the carpet and the tread plate, find the three 'red with orange trace'wires from the front of the loom and join these together in one end of a crimp, then attach the single 'red with orange trace' to the other end of the crimp.
Carried out on a 2012 L322
Job jobbed. Hope this is of use to someone because it drove me fucking nuts.