BMW MK3/Mk4 Drive power down procedure

This is something that isnt documented very well anywhere and personally i have totally destroyed a MK3 unit once by not realising this and unplugging the device before its ready.

The MK3/Mk4 bmw drive unit powers down fully and correctly approximately 1/2mins after the ignition has been turned off, if the power supply is cut or interrupted before hand then the devices ram corrupts.

To fully powerdown/make sure the device is ready to be unplugged:

  1. Turn off ignition get out and close door
  2. Go to the boot and open
  3. Look at the device the light should flash (this is when its writing and reading the memory)
  4. Wait roughly 1-2mins until the light is totally off

If no light is active then the device is fully shutdown

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