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I think I found the answer to my own question: In WM_01.pdf on page 01-17A-5, section "Battery inspection", subsection "Back-up current":

Also have this problem I seem to have the same battery drain problem as discussed in this thread. I also see about 0.4A draw in the "ROOM" circuit, that (after a few minutes) drops to about 0.3A and stays at that level. I'm the original owner of the car, never had special (non-stock) parts...