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Discussion Starter #1
Hello all,

I've been fighting this battery drain issue for about a month now where I have to jump the car every 2-3 days if I don't start the car. The car is a 2006 TSX with Nav.

Last week, I took the time to read the forums and read that the Bluetooth module is the culprit so I decided to take off the module and disconnect it entirely since I don't use it at all. I decided to let the car sit for 4 days and the battery still drains.

I bought a DMM to test what was draining my battery. Beforehand, I had the drivers' door open and had a block of wood + channel locks pliers + tape (couldn't find my vise grip) to clamp down the door sensor since I wanted to test the interior fuse box too. I also disconnected any wiring/charger that was connected to my aux/power outlet and turned off all switches/buttons. I started to disconnect the negative battery cable, waited 15 minutes so the car can go to sleep, and did a battery test which came up to 12.03V. I started taking out all the fuses that are in the engine bay and found that the back up, ACC 40A fuse made the DMM/battery jump from 12.03V to 12.24V. I put that fuse back in and proceeded to test the interior fuse box and found no issue. Took off the DMM from the negative cable and installed the negative cable back on. I decided to test the alternator and it came up to 14.32V which is good.

Question is, what does the back up, ACC 40A fuse connects to? I still have my stock Nav/radio in the car with no modification to it. The only recent upgrade I did was LED interior light bulbs and LED daytime running lights. I also have the Morimoto's LED foglights which I'd installed close to 2 years ago. Those are the only aftermarket items I have on the car; no aftermarket alarm or cameras.

Any help is appreciated and thanks in advance! ✌
 

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Discussion Starter #2
Did a series of tests within the interior starting from the DVD drive, nav/radio, sub-display clock, dome light/home link, and found that something is still draining my battery.

Decided to check the location where the amp was. I took off the compartment below the radio and noticed there was a small light bulb (that was burnt) that is used to illuminate the compartment. Took off the burnt bulb and disconnected/removed the whole amp. I unplugged the 40A fuse, checked the DMM and the amps did not jump. Maybe I found the culprit. I installed the amp, reconnected the wires, checked the DMM and it was stable.

This could mean that the little light bulb was draining my battery the whole time. While I was still inside the car, I decided to replace all the LED bulbs back to incandescent bulbs. I will update this post in/after 4 days to see if the car will start right up after sitting for 3+ days.
 

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Discussion Starter #3 (Edited)
Alright, a little update.

Lately, the car would die after 2 days of sitting without starting but the car starts up right away after sitting for 3+ days.

Checking the dashboard/center console accessories would be the best bet if anyone has this issue and already disconnected their Bluetooth module.

Dashboard/center console accessories: nav/radio, sub-display clock, preamp, compartment lights.
 

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Have you investigated the positive battery cable? I had a drain issue for a long time where I would periodically get a "charging system" light. That would flash for a split second and go away and come back, disappear in winter time, etc. Eventually my battery would get weak and die, then alternator. Then vice versa for a long time. I thought the blue tooth thing was the issue. Didn't solve my problem.

Ended up being bad wiring in the battery harness. I didn't get it confirmed. I just replaced it from process of elimination and from a few reports here on the issue. I would suspect you would get a system charge light as well but this might be something you want to look at.
 

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Discussion Starter #5
Have you investigated the positive battery cable? I had a drain issue for a long time where I would periodically get a "charging system" light. That would flash for a split second and go away and come back, disappear in winter time, etc. Eventually my battery would get weak and die, then alternator. Then vice versa for a long time. I thought the blue tooth thing was the issue. Didn't solve my problem.

Ended up being bad wiring in the battery harness. I didn't get it confirmed. I just replaced it from process of elimination and from a few reports here on the issue. I would suspect you would get a system charge light as well but this might be something you want to look at.
Thanks for contributing!

As for my car, I didn't have any warning lights on and the positive battery cable is still in good shape (but I'll keep an eye out for that in the future.) It was something within the dashboard/center console that was draining my battery. The car starts normally as it should without any issue. 🙏
 

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Not really sure. If you can find the fuse and pull it you could then check your battery drain and see if that was the issue.
 

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Discussion Starter #7
Not really sure. If you can find the fuse and pull it you could then check your battery drain and see if that was the issue.
I was speaking in general haha. I already found the culprit and fixed the issue. Thanks
 
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