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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 11-15-2012, 08:30 PM
steveh330i steveh330i is offline
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Location: Orange County, Ca
 
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Mein Auto: 2003 330i
Question Disconnect battery - part 3

2003 300i

Another follow up to my original post on the same subject. The car is parked outside in a carport with no power outlets - no option of connecting a battery tender when I leave it untended for weeks or longer. I plan on disconnecting the battery in that case with a quick disconnect tool on the negative post. But I've heard from several people that if I lock the car doors beforehand and then close the trunk with the battery disconnected, I won't be able to unlock anything with the key. Could that be true?
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  #2  
Old 11-15-2012, 11:13 PM
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cwsqbm cwsqbm is offline
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Mein Auto: ED'd 330Ci / E30 325i
You won't be able to unlock anything with the buttons on the key. You'll still be able to stick the key in the trunk and open it, or stick the key in the driver's door and open it. The only thing that's slightly hard to do with the battery disconnected is open the driver's door on a coupe, since coupes normally roll the window down a little bit on opening.
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Old 11-16-2012, 06:59 AM
steveh330i steveh330i is offline
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Location: Orange County, Ca
 
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Mein Auto: 2003 330i
Thanks. What I meant to say was, "I won't be able to unlock anything using the key manually." Your answer tells me I can. But my original query didn't include 2 youtube videos I came across. The first at refers to the problem in an E32 and E34, and it offers a solution. I thought it might be the same with my E46. The second video at is for an E46 and offers no resolution.

All that got me to thinking.
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  #4  
Old 11-16-2012, 07:03 AM
joegr joegr is offline
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Location: Gulfport, MS
 
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Posts: 203
Mein Auto: 2002 325i
A battery in good condition will go for months left connected.
Verify that your mechanical key locks work. Failure of these is not unheard of.
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  #5  
Old 11-16-2012, 07:57 AM
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jvr826 jvr826 is online now
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Location: In the woods. Santa Cruz County, CA
 
Join Date: Apr 2002
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Mein Auto: 05 330ci 6MT
In video 2, "look how smoothly this glides" means the mechanism is broken.
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Old 11-16-2012, 10:23 PM
GoForthFast GoForthFast is offline
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Mein Auto: '04 330Ci 6-speed
Leave my car for two months at a time with a sound battery and starts every time.
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