2008rdx - parasitic draw & malfunctioning rear hatch lock
 

Hi, I have a 2008 rdx and recently got a parasitic draw that was killing the battery. I narrowed it down to fuse 23 (backup power). Things are fine when i pull the fuse and i've been driving it around without it, but now i have no radio/electronics/nav etc. I am about to take it to a place to get it diagnosed as to the exact cause of the draw. Before that i was wondering if anyone here had a few thoughts on this matter - garage electrical diagnosis in my area goes for around $90-$100/hour CAD.
Also, the rear hatch lock is constantly engaging/disengaging and causing the hatch warning light to come on while driving. The rear hatch will then be slightly ajar and i have to push on the hatch it to lock again, then 1 minute later it will unlock. The only way to fix it temporarily is to pull fuse 25(car door locks), so now all door locks are manual. Are these 2 problems related or do i just have 2 different problems?

90% chance the parasitic draw is from your Hands Free Link (Bluetooth) module because that is a very common issue on these vehicles. You can just unplug the module and everything else will still work.

Yes that was the first thing i tried when i started researching the issue. Unplugging it didn't fix it
Also, HFL isn't connected to fuse 23, it's fuse 35... but i'm no expert maybe there is some relation?

when you lock the doors with the fob does the car beep?

I have the same problem, measured around .3 to .5 A drain on the battery with the car off, down to 0 when fuse 23 was removed ( i unplugged the HFL and it dropped slightly before i tried fuse 23)

Replace the trunk lock actuator

I had the same issue in my 2010. The lock kept getting stuck in the depressed position which caused a phantom draw. I replaced the lock actuator and no more issues. $500 part.

$500 😓