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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 07-02-2008, 03:38 PM   #1 (permalink)
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Question Battery replacement in 2001- 320i

I am a new BMW owner. The battery in my 2001- 320 i has given up. I tested it and got 10.6 volts only. Obviously one cell has shorted. I replaced it with an Energizer for 1/2 the price. The original one has a little vent tube hooked up to vent to the outside of the wheel well due to possible hydrogen from over charging that may get inside the car because it it located in the trunk. I cover the battery with a piece of thick poly and hot glued the nipple to it and hook up the tube. It should do the same job. However, due to the momentary disconnection of the battery, the radio/CD player and the digital mileage read out below the odometer (don't know what it is for) are not functioning. they both show ....,....-...,...
I heard that I have to re-set them. Can someone who knows BWM advise me how to re set these ?? It would be much appreciated.

Thanks,

Last edited by Karluver; 07-02-2008 at 03:41 PM.
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Old 07-02-2008, 09:00 PM   #2 (permalink)
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you'll need to input the radio code before you can get it to function again. The code is marked on a card along with your owner's manual...
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Old 07-03-2008, 09:55 AM   #3 (permalink)
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Cool Battery replacement in 2001-320i

Thank you Darkhorse,
I do have the card with the owner's manual. The first one is the model number of the radio and the second one is the serial number which has many digits. Which one should I use and which button should I press to re set it ??

Thanks again,
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Old 07-03-2008, 10:24 AM   #4 (permalink)
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There should be a separate code. The code is entered using the numbered radio station preset buttons.
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Old 07-04-2008, 02:35 PM   #5 (permalink)
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Smile Replacing battery in 2001- 320 i

Thanks to both Darkhorse and Witeshark for their advice.
I fiddled around last night and got the radio/CD player and the clock working again without inputting any code. I took the battery off casually after reading the whole manual. There is no warning that I could have lost all the memory in the radio/CD player and the service reminder. But I have heard rumours about that though.
Just a friendly advice to owner who wants to replace the battery themselves, hook up a 12VDC power source (using 2x 6v lantern batteries or use a small amp charger before you disconnect the old battery so that the car electronic gadgets will not have a break of power supply. Otherwise you may lose memory in the gadgets like I did. A little extra work will save a lot of grieve. A 72- 41N Energizer (Walmart @ Cnd $89.95) fits nicely in 320-i.
Don't forget to cover the filler cap with duct tape and thick poly and hot glue the barbed nipple and connect the vent tube so that the hydrogen fume can escape and not filling the trunk.
That's my 2 bits.
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