07 overnight battery drain

[onefast450r]

I have a 2007 mdx with around 83000 miles on it, i went out the other morning about 3 weeks ago to start it, and it wouldnt crank over, all the dash lights would just go click, click, click really fast. so i had to have it jumped started and i took it down to my local auto store to replace the battery. i figured it was almost 6 years old and the battery was just wore out. so i had a new battery installed, everything was good. a few days later i head out to start it again, and it started but it just sounded like a really weak start, didnt think to much about it. sat morning i go out again to start the vehicle, click,click,click, wouldnt start, dead battery. so i charge the battery, and then take it for a nice ride, turn it off and on a few times, everything sounds normal again, i did find where i had left one of the dome lights on, i just figured the battery had died because of that. so yesterday morning i go to start it again, wouldn't start battery was dead again. i didnt know what to think. so i got on mdxers and started reading about parasitic draining of the batter over night. saw alot of complaints about the hfl being the culprit. so i went out and sat in the mdx made sure everything was off, locked the doors and alarmed it with me inside. sat there for a moment and heard a static noise that would come over the speakers that was really faint everything 45 secs for about 10 secs at a time. i didnt know what it was just knew it would playing through the speakers. it would keep doing that over and over and over. so i went ahead and located the hfl and disconnected it, and the noise over the speakers went away, plugged it back in and it would return. so i left it unplugged overnight, went out this morning to start the vehicle, started up no problem, battery didnt sound weak or anything. so my question is, does this sound right that the hfl is having problems? has anyone else experienced this weird noise that causes to overnight battery drain? is there anything else i should check out? i do have an appointment at my local dealership this thursday, anything i should ask them or have them check out. i am going to have them also check into the tsb concerning transmission shutter when the vehicle doesnt wanna downshift when it should. thank you

[SuperTech]

Two main culprits for battery drain for your vehicle is the HFL and the A/C compressor clutch relay. And both can be sometimes intermittent. So unplugging one to rule it out is an excellent strategy.

[onefast450r]

Supertech, thanks for the reply. Still have the hfl unplugged and so far so good. I Do have an appt at acura on thursday so i will come back and post what they have to say. Thanks again.

[sukhi]

Originally Posted by onefast450r

Supertech, thanks for the reply. Still have the hfl unplugged and so far so good. I Do have an appt at acura on thursday so i will come back and post what they have to say. Thanks again.

how i can unplug the hfl i have the same problem on my mdx

[onefast450r]

The hfl on the mdx at least in my 07 is located in the back of the center console behind the heating/cooling controls. Sit in the second row seats and pull the cover off towards the back of the car. Once the cover is removed youll see the hfl, its a grey box, unplug the connector from it on the right. For me it was not covered under warranty, and i was told just to leave it unplugged indefinately.

[sukhi]

thanks i will look into that in the morning

[sukhi]

thanks onefast450r I have unplugged the HFL unit and looks good without it

[dshedrick]

Thanks, I have the same exact issue. My battery was dead again this morning for the 2nd time in a month.
I spoke w/ a Acura tech about the "ghost" sound and they did not hear when upon inspection. Take note, my HFL does not function any longer and I'm wondering if this is a symptom of that. Does hour HFL function? In my case, my BT does not show up on the display nor does pressing the HFL button brings up the voice prompt.