2008 Acura TL battery drain problem, please let me know what you think the problem might be?

[JimPghPA]

Hi everyone. I have been trying to find a parasitic battery draining problem on a 2008 Acura TL.

Someone else has already tried to find what's draining the battery on this vehicle and could not find it.

I found that removing a 7.5 Amp fuse labeled rear, in the under dash fuse box will sometimes cause the constant draw of around 0.66 Amps to drop to a normal amount of 0.012 to 0.062 Amps. But when that fuse is out, many things will not work.

I have tried unplugged the voice recognition module in the top center by the rear view mirror, the backup camera, the in trunk DVD CD player, and every electrical connector in all 4 doors.

The only thing I know of that might be causing this problem that I have not yet unplugged is the sun sensor on the dash near the front windshield. In front of where the glovebox is. And that is going to be a bear to get to, if we try disconnecting that.

Are there any other items that are common causes for draining the battery on 2008 Acura TL vehicles?

Unfortunately the few schematics I can find do not give a clear breakdown about everything that 7.5 amp powers.

 

[ctechbob]

99% of the time it is the HFL/bluetooth module which as I recall is overhead. You can tell which one it is because the chips on it will be warm 24/7. Lives above the overhead console.

I had my old one kicking around for a while, but I think it went in the trash or I'd take a picture of it.

 

[ctechbob]

This one:

 

[JimPghPA]

99% of the time it is the HFL/bluetooth module which as I recall is overhead. You can tell which one it is because the chips on it will be warm 24/7. Lives above the overhead console.

I had my old one kicking around for a while, but I think it went in the trash or I'd take a picture of it.

I did disconnect that today and the drain did not go away.

I took out the four 8mm hex head screws, and disconnected it and even removed the board completely. The drain still is there.

 

[Nick1994]

I asked ChatGPT and it recommends unplugging the trunk latch/light circuit.

It said the HFL module is most likely, and to check after the car has been asleep for 30 min

 

[JimPghPA]

I asked ChatGPT and it recommends unplugging the trunk latch/light circuit.

It said the HFL module is most likely, and to check after the car has been asleep for 30 min

I did that also when I unplugged the backup camera. I forgot to mention that in my original post.

 

[ctechbob]

What things don't work when you pull the 'rear' fuse?

 

[JimPghPA]

What things don't work when you pull the 'rear' fuse?

The owner found quite a few things not working when I removed the 7.5 Amp " rear " fuse. I knew the back-up camera was not working. She said the radio, and navigation and key-fob also did not work.