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TBM TBM is offline
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Default 2007 E90 - Battery Drain: Car Does Not Enter Sleep Mode - 06-20-2015, 02:21 AM

So I've been dealing with a battery drain issue. I've done tests, and it's not the alternator nor the battery.

What I've noticed:
After locking the car, the car does not enter sleep mode. The START/STOP pushbutton LED and shift lever LED should turn off after 5 minutes. In my car, they stay on continuously. I have comfort access and I place the key fobs far away from the car.

Another thing that happens is that the LPFP (fuel pump) primes every 13 seconds, which would explain the car not being in sleep mode OR it's constantly being woken up.

As a result, my car is drawing a lot of current during this ordeal (around 7-8 amps) which eventually drains the battery.

I need to stop the car from being awake.
What would prevent the car from going into sleep mode?

Any help is much appreciated!
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Default 06-20-2015, 08:42 AM

Crazy idea - since you have comfort access...have you tried removing your batteries from your fobs? Just wondering if they are the culprit. Maybe one got water in it or something, maybe under the lock button?

FYI it's more like 15-20 minutes before your car will "sleep". At least on my e90 and e82.
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Default 06-20-2015, 12:18 PM

Yes I actually did that even before you mentioned it.

Something strange happened. So I removed the batteries in both my key fobs while my battery was disconnected and connected to a trickle charger.

I removed the trickle charger and then connected the battery. (Remember my car is locked the whole time and the fob batteries are removed.) after the battery was connected, I left the car and came back after two hours. Lo and behold, the car was asleep and I got a little excited. So I put a battery back in one of the fobs and started the car. Idled the car for 5 mins, turned it off and locked it with the key fob. Checked after 1/2 hr and the car didn't go into sleep mode.

I have it on the trickle charger again. My next step is to do the same for the other key fob and see what happens.
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Default 06-20-2015, 12:39 PM

I see your car is a 2007 model.

How old is the car's battery?
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Default 06-20-2015, 12:42 PM

One year old. And I tried a different battery (not new, but was good and fully charged.)
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Default 06-20-2015, 04:09 PM

Hmm....how do you register a used battery? These cars need new batteries every 4 years. I wouldn't be surprised if this was related to your issue....
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Default 06-20-2015, 05:49 PM

The battery isn't registered but it's been in the car for a year without issues. I don't think it's the battery because I can see the car drawing current as the car stays awake and doesn't go to sleep.
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Default 06-20-2015, 07:56 PM

Have you made any modifications to the stereo or other electronics?
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Default 06-20-2015, 08:54 PM

Stock radio. Electronic mods are just a JB4 G5 ISO. I've had it on the car for about two months. I wired in paddle shifters about a month ago. The car was at a body shop for windshield replacement. I believe they replaced the rain sensor as well. That's about the only electronic thing I can think of that they touched. I picked it up on a Thursday. Drove it Thursday and Friday. Parked it Friday for the weekend. Battery was dead Monday morning. Coincidence? Maybe.
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Default 06-20-2015, 11:10 PM

Looks like you're going to have to start unplugging fuses to some of the systems to see what's keeping the car awake. Not ideal. Hopefully someone else can chime in. I'm interested in your problem though.
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Default 06-20-2015, 11:14 PM

Yes, I want to start doing that but I'm afraid to do it since the car is awake. If the car went to sleep, I could hook up an ammeter in series between the negative cable and negative battery terminal, then keep an eye on the current draw as I unplug the fuses.

I'm afraid to start pulling fuses now for fear of damaging modules, because some modules will be awake since the car is awake.
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Default 06-21-2015, 09:22 AM

HOPEFULLY the car is designed that when a fuse blows (most likely when awake) that it doesn't damage anything, considering the most basic purpose of a fuse to begin with....lol
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Default 06-21-2015, 10:28 PM

I think I may have found the cause. :D

After spending hours on and off over the last few days, I started pulling fuses and I got to fuse #31. I was going off my car waking up every 13 seconds and the sound off the LPFP priming every 13 seconds. When I pulled it, the car went to sleep and no sound of fuel pump priming. Fuse #31 is the CD player (20A). No idea what caused it but at least I can drive my car now knowing that my battery won't die. I will investigate about the CD player later...

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Default 06-22-2015, 04:20 AM

Do you have idrive?
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Default 06-22-2015, 04:48 AM

No sir. Just a BMW Professional radio w/ Bluetooth. The radio isn't running when I shut the car off, or at least I can't see that it's on. So it was running in the background somehow.

Last edited by TBM; 06-22-2015 at 08:25 AM.. Reason: typo
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Chriztian09 Chriztian09 is offline
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Default 07-18-2016, 12:11 PM

Quote:
Originally Posted by TBM
No sir. Just a BMW Professional radio w/ Bluetooth. The radio isn't running when I shut the car off, or at least I can't see that it's on. So it was running in the background somehow.
Did you ever find out what was causing the cd player to drain? I'm having this exact problem.
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jide2008 jide2008 is offline
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Default e90 2007 bmw. battery drain, car does not enter sleep mode - 10-11-2016, 05:58 PM

I've been dealing with the draining battery and the car does not enter sleep mode. I removed the radio fuse and the car went to sleep mode but I can't play my radio. anytime I put the fuse back it draining my battery overnight. I like to listen to my radio. need help anybody know why the radio draining my battery. Or any solution. Please.
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Default 10-11-2016, 06:18 PM

I never found out what the issue causing the radio to constantly keep waking the car up was. I ended up getting a used head unit (radio) to get rid of the issue.


2007 E90 335i 6AT - 580whp/550wtq
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Default 10-11-2016, 06:26 PM

Maybe I should replace the radio I hope it will stop draining the battery. Thanks
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Default 10-11-2016, 06:30 PM

What I did to test it is to first unplug the radio fuse. Car went to sleep.
Then to confirm it's the radio, I swapped radios with a friend who had the same car, and the car went to sleep. That's when I bought a used radio, and no issues since.


2007 E90 335i 6AT - 580whp/550wtq
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Default 10-12-2016, 05:38 AM

Thanks. I will buy head unit.
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Default 10-12-2016, 06:11 AM

Hey quick question. Do think is advisable to remove the fuse at night so that the car can go on sleep mode and put it back in the morning. So I can listen to my radio until I get it fits.
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michaelscoffield michaelscoffield is offline
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Default 03-23-2017, 02:00 PM

On March.6 when I start the car the engine fan started to spin right away, since there were no warning lights I proceed to drive home. After about 15 minutes drive the "engine too hot" warning light appears on the dashboard and I reduced speed and kept driving for about 3 minutes, the warning sign became red and I got a power loss. I pulled over for 30 minutes and start the car again with the fan still on and drove for another 5 minutes home. The very next day I towed the vehicle to my mechanic and he said the coolant pump was down.

The vehicle was parking at the shop for about a week waiting for a new coolant pump and bolt to arrive. When my mechanic was about to start the car he found that the battery failed on the car and it is completely dead, the voltage was around 3V. He proceed to replace the coolant pump and also replaced the battery.

After replacing these parts, I picked up the car after that and drove home with no problems, I did not hear the engine fan spin again. After a couple hours I started the car again and after 15 minutes drive the "engine too hot" warning light came back, I pulled over to a parking lot and took a uber to work. After work I drove the car home with no problem. The very next morning when I was about to start the car the battery failed again. Not even let me open the door.

Since the problem happened twice I have to get the car towed to the dealership and let you guys have a diagnosis what caused a battery drain with a newly replaced coolant pump.

The problem happened even before I had the new coolant pump replaced. So the cause is still an unknown. What I am thinking is the DME or some sensor does not let the car go to sleep after shutting the car so the coolant pump continue working cause the battery drain.
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moe041598 moe041598 is offline
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Default Any luck finding out the battery drain issue? - 10-21-2017, 09:25 AM

After you towed it to the dealership, did they figure out the battery drain issue? Because I have the same issue. Has a new battery (less than 10 months old-programmed by bmw and everything), new alternator and new ground.
-Charged the car overnight and car will start up fine. However, while the car is running, the V is testing at 11.1 volts when its supposed to be around 14V. After charging the battery overnight, I started it, let it idle for about 5 minutes and after shut it off. When I start it up for the third and fourth time, I keep getting a battery discharge malfunction light.

Then later, the car wont start (alternator somehow not charging the battery) and have to keep going in a cycle of charging the battery. Also read about the "sleep mode" that the car is supposed to go in. And my transmission gear lights are off after I lock the car so that is not the issue. Any suggestions will be much appreeciated! Thank you
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michaelscoffield michaelscoffield is offline
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Default 10-22-2017, 01:42 AM

Quote:
Originally Posted by moe041598
After you towed it to the dealership, did they figure out the battery drain issue? Because I have the same issue. Has a new battery (less than 10 months old-programmed by bmw and everything), new alternator and new ground.
-Charged the car overnight and car will start up fine. However, while the car is running, the V is testing at 11.1 volts when its supposed to be around 14V. After charging the battery overnight, I started it, let it idle for about 5 minutes and after shut it off. When I start it up for the third and fourth time, I keep getting a battery discharge malfunction light.

Then later, the car wont start (alternator somehow not charging the battery) and have to keep going in a cycle of charging the battery. Also read about the "sleep mode" that the car is supposed to go in. And my transmission gear lights are off after I lock the car so that is not the issue. Any suggestions will be much appreeciated! Thank you


H there, my problem was the bad water pump, it won't stop after the car was shut so it kept running to drain the battery, after replacing the pump car went all good.
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