I have a 2012 Honda CRV EX that has a battery that drains after not using it for a period of days.

I checked the alternator and tested the battery and they are both working.

I checked the fuses and found that it has a parasitic electrical drain on fuse 29 under the hood.

I have disconnected the hot fuses under the dash and had no change. I then disconnected the three wiring harness above them.

When I disconnect the bottom (blue) wiring harness the drain disappears.

My problem is that I can't find what this wiring harness if for so I can track the drain further. Any tips on the next step to see where the drain is coming from?