Is it loud enough for you to record and upload for me to hear? Since you noticed it on the passenger side, could it have been the blower motor for the A/C and heater?
Here is what I would suggest: Since this is a draw on the battery with everything off, that means a circuit is providing power when it shouldn't. Where I need you to start is under the hood in the power distribution box (fuse box).
Remove one fuse at a time until the sound stops. Identify the fuse and using the back side of the panel cover, see what circuit that fuse is for.
Do this and let me know what you find. Also, if it is loud enough, record it and upload it for me to hear.
I will watch for your reply.
Monday, April 18th, 2022 AT 8:19 PM