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Old 02-11-2013, 10:58 AM   #1 (permalink)
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07 overnight battery drain

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
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Old 02-11-2013, 10:23 PM   #2 (permalink)
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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.
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Old 02-11-2013, 10:35 PM   #3 (permalink)
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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.
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Old 02-25-2013, 10:08 PM   #4 (permalink)
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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
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Old 02-25-2013, 10:20 PM   #5 (permalink)
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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.
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Old 02-26-2013, 01:15 AM   #6 (permalink)
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thanks i will look into that in the morning
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Old 02-27-2013, 01:35 AM   #7 (permalink)
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thanks onefast450r I have unplugged the HFL unit and looks good without it
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Old 02-28-2013, 01:35 PM   #8 (permalink)
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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.
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Old 08-15-2013, 12:00 AM   #9 (permalink)
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My 2007 MDX battery went dead twice in last 4 days.
Not taking chances, I'm plugging battery on a smart charger every night.
I think the drain is coming from HFL unit
Acura already assessed this, and when I put new battery, I asked Acura to reconnect the HFL unit.
The battery lasted 2 years, and I'm sure the battery is still good.
Any other ideas?
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Old 12-10-2013, 02:18 PM   #10 (permalink)
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Hello all. I have this same problem, except I'm a bit farther down the road with the troubleshooting. First, put in a new battery. Then, I was told by my car tech that Acura put out a bulletin about the AC relay so I gave them the go ahead to replace it. $300 later for all this and alas, the problem is with me again today after being in the shop only 1 week ago. Same problem, overnight drain, barely enough voltage to create flickering and clicking, flashing on dash, etc...otherwise, once jumped, it works during the day without issue. Interestingly enough, my 2007 MDX HFL stopped working a while ago too, and now I happen to have this battery drain. Will attempt a disconnnect of the HFL and see if that takes care of the problem. Seems to be an every-other-week issue or so will take a few weeks to report back.

This is my 3rd Acura, and after my first had one, I loved them...but I'm starting to see a shine come off the apple with these cars a bit. TL Transmission issues, faulty HFLs, catalytic converter failures, A/C relays, what's next?
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Old 12-11-2013, 01:30 AM   #11 (permalink)
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Took out HFL

Hey all, I just posted earlier today and after doing more research I managed to pull out the HFL unit on my 2007 MDX. I will let you know from time if the parasitic battery drain issue is resolved with this HFLectomy.
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Old 12-11-2013, 06:22 AM   #12 (permalink)
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Did Acura ever updated the HFL module to fix this problem? I would replace mine with a new one but Im afraid its gonna crap out within months...
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Old 12-11-2013, 06:41 PM   #13 (permalink)
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Did Acura ever updated the HFL module to fix this problem? I would replace mine with a new one but Im afraid its gonna crap out within months...
Nope still the same old HFL, and my local dealer played dumb when I mentioned it was a known and common issue. I then gave him the TSB number and he said he'd get back to me. Still waiting for that call back (it's been several months).

The CD changers have a tendency to grenade on the inside too (mine did shortly after the HFL crapped out). I went with an aftermarket Pioneer setup for nav, bluetooth, stereo, etc... So far my wife is happy with it.
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Old 12-23-2013, 08:27 PM   #14 (permalink)
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I too have the same problem with my 07 MDX. Is removing just the heating/cooling face plate enough or the whole center console itself? Pretty cold here in MN, I don't want to break any plastic while trying to get at it.
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Old 12-23-2013, 10:26 PM   #15 (permalink)
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Just remove the heater
http://www.mdxers.org/forums/643610-post29.html
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