Question about 2001 BMW Z3

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Battery drain i have a battery drain , i seemed to isolate it to the clock,alarm, computer circute Started suddonly any further test to isolate problem?

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  • fljoe1 Oct 29, 2008

    Thanks for your help .But I finaly isolated the cause. it was the Radio. it seems this is on the same circuit and even off it would draw up tp 300 milamps.

    Never figured it because of making sure it was shut off.



    Thanks again Joe

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2 Answers

I have the same battery drain problem - left for any length of time, the battery will go flat...however it definitely does hold a charge, and the car is charging - if I disconnect the battery between journey's, it will be fine when re-connected.

Although I've not mananged to fix it yet, it might be worth checking the boot light. It sounds odd, but it's a moderately common problem whereby the interior light doesn't go out when you close the boot.

You can test it quite easily by triggering the plungers on the boot lid to see if the light goes out.

I discovered this, disconnected the bulb and my problem disappeared instantly for a couple of weeks...although it's since returned!

Worth checking tho :)

BTW..boot = truck if you're in the US I think.

Posted on Oct 28, 2008

Jeremy Dellow
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Best bet is to disconnect the clock and disable the alarm and see if you still have a drain. If you do, it's likely that it's something inside the computer (although that seems far-fetched). Chances are there are more components than that in the suspect circuit. However, that being said, I'd suspect the alarm system - the ECU doesn't really draw power with the car off, per se, and the clock is a minimal drain. Something shorting out in the alarm however, will likely drain your battery quickly. I have seen faulty sensors added as part of an alarm system cause battery drains in the past.

Posted on Oct 15, 2008

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HI. I would start by isolating the actual drain.

Here is a procedure I use to isolate a battery drain. Remove the negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you have just disconnected. The test light will glow or "light" if there is a drain. If the "light or glow" is faint, that is probably normal draw for the clock or computer. If the "light or glow" is bright, this will indicate a large drain is present. That should be corrected,asap. Now start removing and replacing the fuses one by one until the light goes out; The one fuse that causes the light to shut off, will be the circuit with the drain. Remember to close the car doors, when testing. If not, the interior doom light will interfere with the results of the test.

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