bmw 5 series dead battery

[ian hodgson]

hi guy s , i ve an 2005 bmw 523i .. had it 2 month , left it sitting , for 2 weeks and now it is completely dead . any ideas poss key battery or car battery ??? my keys wont even open doors . have to do it manually .would this cause the car to immobilise.

thanks
hodgy

Topic

[Wayne]

Immobilizer circuit needs power and is connected to the ignition. If you mean would your alarm, factory or otherwise, kill the vehicle in addition, yes, very likely….If anything had power. You should find that out as soon as you manually open a door. Which will tell you if it’s your key fob battery or the car’s.

Once the vehicle does get power use your key fob to deactivate/unlock door(s) as usual. These are not volatile memory setups, they will keep their encrypted codes stored regardless of loss of power(even prolonged).

[ian hodgson]

thanks ,, i assume i can just charge the battery up as per usual ,trickle charge with batt left in position .im abroad just now , the wife told me when she went to start it there was nothing at all .no lights on ash ,, if so something must be draining bttery ?

[college man]

Take the car to an auto part store and have the battery and alternator
load tested for free. check out this link.

http://www.ericthecarguy.com/faq/solving-automotive-electrical-problems

[Player101]

If your wife was driving the car, may be she left something “on” the last she was in it. Have the battery charged up and see if the problem will pop up again. If the battery is a goner, make sure the new one is the same as the old (voltage, starting amperage, even brand) BMWs are quite picky when it comes to the battery used.

[ian hodgson]

thanks guys , i was last one in it over two weeks ago , just switched it off same as usual ..ill charge it up when im home and see what happens from there .

[Lorrin Barth]

If a battery is long in the tooth it can easily go dead in two weeks. My previous battery, if I drove the car daily, would start and operate the car perfectly. Let it sit for 5 days and dead.

[ian hodgson]

im hoping the dealer who sold it will make an appearance at house today , car cost a few pounds or dollars ..not happy thats its dead after 3 month .. ..

[Lorrin Barth]

You need to realize modern cars have things running in them whether the car is on or off. So, none of them can sit for an extended period without running the battery dead.

[EricTheCarGuy]

I vote for having the battery and it’s connections checked. It’s the first thing to check with any electrical problem anyway. Even though the battery is new to you, it could have sat on a shelf for some time. More information here.

http://www.ericthecarguy.com/faq/solving-automotive-no-start-problems

http://www.ericthecarguy.com/faq/solving-automotive-electrical-problems

Good luck and keep us posted.

[ian hodgson]

Thanks guy s , home in three week s so ill get it checked out , ill keep you s posted .. cheers

[ian hodgson]

alright guy s , update on my battery problem . dealer came out yesterday and hooked it up to a booster pack , started no problem so when i m home ill take it to an auto electrician and see how the battery is , also see if there s anything draining it ..

[EricTheCarGuy]

That sounds like a plan. Keep us posted.

[Author]

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