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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > So what happened to my car?



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      02-10-2013, 01:47 PM   #1
TiAg330i
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So what happened to my car?

Today, my 7 year old E90 battery was totally dead. Yesterday, it was fine. So I hooked up my battery charger to the positive post under the hood and also to a bare nut (for a ground) at the top of the strut tower. Red went to positive and black went to the ground.

So after a few seconds of the charger being connected, the car started blinking inside and acting like it wasn't hooked up correctly. I immediately unhooked it and was perplexed as to why it wasn't charging correctly. Also, I can't seem to get into the trunk with the key inside the remote.

What could be going on here?

Any help is appreciated.
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      02-10-2013, 02:38 PM   #2
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you need a new battery!
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      02-10-2013, 02:41 PM   #3
Juiced46
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Well for one your batt is probably just that dead.

2 you are not grounding it properly. There is a ground lug on the passenger side of the engine. Ground it to that. The bolt @ the strut is not a good ground.
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      02-10-2013, 03:56 PM   #4
TiAg330i
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Thanks Juiced.

So why can I not get into the trunk? I am using the manual key inside the remote. Do you have to have power to open the trunk?
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      02-10-2013, 04:16 PM   #5
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Quote:
Originally Posted by TiAg330i View Post
Thanks Juiced.

So why can I not get into the trunk? I am using the manual key inside the remote. Do you have to have power to open the trunk?
Yes, power needed.

Be careful - you can lock yourself in the car when the battery goes.
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      02-10-2013, 04:19 PM   #6
TiAg330i
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Quote:
Originally Posted by Juiced46 View Post
...you are not grounding it properly. There is a ground lug on the passenger side of the engine. Ground it to that. The bolt @ the strut is not a good ground.
Good idea. I tried that but the car still flickers like I'm trying to kill it electrically. I'm really surprised I can't get it to charge.

If nothing else works, I'm going to have to have it towed out of my garage and to a shop.

Any other ideas?
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      02-10-2013, 05:10 PM   #7
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Do you have the valet switch, switched to off? This will prevent you from getting into the trunk.

How long are you leaving the charger on before trying to start it?
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      02-10-2013, 07:20 PM   #8
bender rodriguez
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Time for duralast
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      02-10-2013, 10:52 PM   #9
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Quote:
Originally Posted by mryakanisachoad View Post
Yes, power needed.

Be careful - you can lock yourself in the car when the battery goes.
Isn't there an emergency trunk lever somewhere in the car in case your keys are locked in the trunk? I thought I read that in the manual, but maybe I have it backwards?
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      02-10-2013, 10:55 PM   #10
mryakanisachoad
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Quote:
Originally Posted by bplewis24 View Post
Isn't there an emergency trunk lever somewhere in the car in case your keys are locked in the trunk? I thought I read that in the manual, but maybe I have it backwards?
Yes, there's an emergency release in the trunk.

But, I didn't write trunk. I wrote car, which you can be locked in if battery dies while you're in it. There's no release inside car.
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      02-11-2013, 02:08 AM   #11
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7 years is a long battery life
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      02-11-2013, 01:06 PM   #12
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Quote:
Originally Posted by mryakanisachoad View Post
Yes, there's an emergency release in the trunk.

But, I didn't write trunk. I wrote car, which you can be locked in if battery dies while you're in it. There's no release inside car.
I can see the unlock button not working, but pulling the door handle twice won't work? I always assumed that was a manual thing.
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      02-11-2013, 01:10 PM   #13
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Im glad my e90 has a trunk key hole.
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      02-11-2013, 01:18 PM   #14
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Quote:
Originally Posted by foghat View Post
I can see the unlock button not working, but pulling the door handle twice won't work? I always assumed that was a manual thing.
Nope. The double pull requires electricity.
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      02-11-2013, 02:59 PM   #15
TiAg330i
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Quote:
Originally Posted by ihsanshaik View Post
Im glad my e90 has a trunk key hole.
I was glad too until I realized it won't turn if the battery is dead. In other words, I could not get the trunk open with the key.

I had to try the inside release button once I had the battery charger hooked up to it to get it to unlatch. Shortly afterwards, the car went completely dead even with the charger connected. I'm in the process of replacing the battery now.
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