For my 2003 Lexus RX overnight battery drain, mechanic determined in was a constant 4.2 amp draw coming from somewhere INSIDE the vehicle. But, it was NOT the Multiplex Body Control Module said to be the specific problem by some. I have checked the full diagram of the vehicle's electric system but it does not break down specific sources, likely since they probably all go thru large amp points. Is there a way to find single sources of a 4.2 amp electrical draw, which I might be able to fix or disconnect??
Thank you for any suggestions. John L.