2001 E46 325i - Battery Drain Problem

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  1. 2001 E46 325i - Battery Drain Problem 
    #1
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    mccraque's Car Details
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    Hi guys....after some advice.

    I have just acquired an E46 2001 325 Touring.....Seems to have a battery drain issue. I've owned it for less than 3 months, and immediately this problem presented itself. Am talking to the dealer with regards to the warranty at present.

    Battery fully drains itself from a fully charged battery to completely flat within a 3 day period. That said....sometimes it doesn't.

    I replaced the battery just assuming that the old one was knocking on a bit. No joy. BMW looked at the car and told me that it was the ballast (sic?) resistor causing the drain and replaced this as well. However...a week later I am stuck with a fully flat batteried 325 on my drive again.

    Am so fed up...anyone experienced anything similar or have experience of similar issue and remedy?

    Thank you!
     
     

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    mccraque (07-08-2011)

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    Thanks....BMW have done such a test which led to them changing the BR. Hence why i am now scratching my head....
     
     

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    try this mate
    disconnect one of the battery leads and bridge it with an amp meter
    ... place the amp meter in view of a window so you can see it from outside the car.

    lock the car and after about 14 mins it should go to sleep and you should see the amps being drawn drop to a bare minimum. approx 0.2A-0.4A if my memory serves me right

    if it doesnt drop after about 20 mins this means something is not going to sleep.

    i have come across this problem once on an 3 series and was due to central locking kept locking itself over and over even when it was locked.(body control module fault)

    i have also had same problem on a 5 series and it was something behind the o/s/f wheel arch.some sort of heater device if i remember(it was 3 years ago) but could be heard buzzing if you put your ear to the arch

    hope this helps you track your fault

     
     

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    mccraque (07-08-2011)

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    So the car is back with the auto electrician. And guess what? He can find no trace of drain at all. Which is both weird and frustrating.

    They have been trying it for a week....no luck. I am at a loss as to what is causing this.

    Anyone experienced and solved intermittent ones before? Just looking at things to try.

    thanks
     
     

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    Are you talking about the BR on the alternator?
     
     

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    Scrap my last,Has anyone checked the diode on the alternator as if this has gone it will drain back to earth
     
     

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    Thanks Dellboy..I don't know but will ask tomorrow.

    would that be intermittant though?
     
     

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    I had the same problem on my 5 series, the battery would stay charged for a couple of weeks then discharge overnight. After a long time searching, proved it to be the Final Stage Resistor (FSR) which works the internal fan for the demister etc. Why it was only discharging the battery every so often was due to the following. (I did not prove the following fully so it may not be accurate but thought I would mention my theory anyway). It appears that the FSR also controls the electric fan on the front of the radiator when the Air Conditioning is operated. (My air conditioning did not work so I never used it). This fan augments the viscous coupling fan that cools the engine. It appears that the Viscous coupling on my car was broken and therefore was not cooling the engine adequately. Everything was fine as long as the car was moving as there was enough air passing through the radiator to keep the engine cool. However, when I was driving in the town in traffic jams, the engines temperature would rise and this would switch on the air conditioning fan. This started the fault and when I got home, this fan would still run due to the fault with the FSR. After the battery discharged, it seemed to take out the short in the FSR until the next time the cars temperature rose.

    The final stage resistor fault is normally noticeable by the internal fan running eratically but my internal fan ran fine. It is easy to test, just disconnect it for a few days and see if you battery remains charged. Also, when you switch your car off, check after 5 mins to see if anything is running.

    Hope this helps.
     
     

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    Quote Originally Posted by mccraque View Post
    Thanks Dellboy..I don't know but will ask tomorrow.

    would that be intermittant though?
    I wouldn't of thought so as once a diode goes that's it but there is a rare occurrence where it can be,worth checking out though
     
     

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