MerlotTL

So i just got back from a one week vacation, and my battery is dead, its a one month old optimus yellow top, i recharged it and then tried again later and it was still a little weak, so i sat in the car with everything turned off and i heard a relay go off about every minute behind the cluster, Its a very small tick noise. ANY IDEAS?? Ive heard about this happening with other vehicles and the cause was the cd changer was going off on its own. Going to the dealership tomorrow if anything.

BlownJ32T

It could be a defective battery.....

omnuts

Could also be a bad HFL unit

Racewalker

I just had the same thing happen with my 2006 TL after a week's vacation. The local Acura service dept. diagnosed the problem as the HFL unit was turning itself on and off. I've not yet decided where I will replace the unit myself although, with all of the info I've read on this site, that seems quite doable.

Sickboy722

same here my HFL unit went out on my 2006 tl, after a day or two without turning my car on it would drain my battery completely, went to the dealer and they told me it was my
HFL unit, so all i did was pop of the dome light and got a couple of stews off and disconnected the unit since i hardly ever use it, better than spending 300-400 on a new one and that solved my problem, best advise would be to try to disconnect it and see if it solves your problem bro.

KN_TL

iTrader: (3)

^ This is the place to start.

There are a lot of delayed circuits (key cylinder, dash lights, etc) that come into play. But after a certain period of time, the current flow should drop to under 25mA.

If a phone is in close enough range to stay connected, then the HFL unit will never turn off, but there is an issue with many where it doesn't turn off regardless of a connections. So as Sickboy says, start with removing the HFL.

Do you have any means of measuring the current draw from the battery? If not, the next best thing is the dealer.

ttribe

This. Happened to my '06 TL. The HFL unit had gone bad and wouldn't out itself into "sleep" mode; it just kept trying to connect with something (I was out of town for a week) and finally killed the battery.

dhasselbacher

Definitely could be your HFL unit. There was a service bulletin (B05-020) issued by Acura way back in 2006 addressing the problem of the HFL not disconnecting from Bluetooth even when the car is turned off. I have read several posts from users who were able to get their dealer to perform the repairs free of charge, but it's been so long and most of the models from '04 and '05 are obviously now out of warranty.

I've had 2 batteries die early and I've had my '05 since early '06. The first time was due to a defective battery that was replaced under warranty, and I just replaced that one with an Interstate model just late last year. I know my car has the defective HFL but I never tried to have the dealer replace it for free; just don't use it enough I guess.

jtkoo7

Hi. I've been having a similar issue with my 05 TL. A while ago it seems to be dead. I assumed that it was the battery because i had left the car at the airport a few times. I have taken it to the dealer and the dealer says that the battery, starter and alternator are fine. The disconnected the HFL too. The issue seems to have gotten worse as it has become colder. Basically my accessories work fine, the battery light never comes on. It takes several tries to start the car. I can't help, but wonder if the cable going from the battery to the starter is cracked or something. The battery's electrodes are also clean and the ground wire looks fine too. I have noticed that the car has a better shot if I turn off the accessories when I try to start it. It's totally bizzarre because for a while it was just random. Sometimes it would start fine, other times you could tell that the starter didn't have enough power to do anything. now it's just always weak.

LowLow06TLNH6

with all loads off and the hood latch closed door locks locked let the car set for 20 min so all systems go to sleep and check the amp drow...should be below 0.005a.... desconnect the hfl unit and recheck amp drow.... if there is no amp drow with the hfl unpluged that is the problum.....

MerlotTL

So i was so clueless on what to do i just ended up taking it to the dealership, so i got taxed $87.00 to find out it was the HFL, i coulda found out myself just soo lazyyy lol. Anyways made them unplug it because nobody uses it, thanks alot everybody.

Sickboy722

87 dollars could have been saved bro, you could have simply just ask one of us to give you instructions on how to unplug it, takes less Than 5 minutes to do. But glad to hear your problem was solved.

jtkoo7

Anybody know of anything else that can cause that besides hfl?

Hi speed

iTrader: (3)

How do I unplug it? Pretty sure this is what I have going on right now. I hear the relay every minute or so and battery drain.

Will Y.

Post #221 in https://acurazine.com/forums/showthr...=792642&page=5 describes how to remove the HFL.

https://acurazine.com/forums/showpos...2&postcount=47 has a link to the TSB with diagrams that may help with HFL disconnection.

KyJellyTL

jtkoo7 i had the same problem i disconnected my HFL and my car would still die found it the draw was coming from fuse #6 my interior lights i don't know what i'm going do right now i just took the fuse out and have been driving around with no interior lights :/

05 NHB

YUP, just replaced mine. Feel the front left side of the housing unit where your driver dome light is located. That's where the HRL is housed. If it's warm after your car has been parked for a while, then it's not shutting off and therefore causing that parasitic drain on your new battery. It took me 2 new batteries, numerous jump starts, an ECU reflash and this forum to figure it out. No problems ever since. Got mine from: http://parts.sonsacura.com/

Here's the part number if you have the 04-06, Black Leather interior: TELEPHONE ASSEMBLY, HANDS FREE (MOON LAKE GRAY) 39770-SEP-A02ZA$163.05
$ 163.05Shipping & Handling (MD, USA)$ 23.00Total
$ 186.05
Good luck

05 NHB

Just replaced mine so it's still fresh in my mind: I carefully pried out the sunroof rocker switch with a small pocket screwdriver, unplugged the dome ligh connector, removed four 5/16 sockets, unplugged HFL module and replaced. Took me about 5 minutes. Here's the service bulletin: Google Acura service bulletin 05-020
Good Luck

cwallachy

Okay so unplugged the HFL, guess I'll replace mine... just curious, I saw someone posting about the Stereo running when the car was off... is this another possible issue?

cwallachy

OH AND WHY, if this is a known issue ACURA did you not recal and repair????

akash4u

iTrader: (3)

Mine did the same thing. It was a bad HFL unit.

NBP04TL4ME

Before you replace you may want to read what geepurs did in this thread -

https://acurazine.com/forums/showthr...7#post13854757

You still may wind up replacing but you might want to try this free fix first.