After Jumping Dead Battery All Hell Broke Loose!

[gbnxio]

I know there's some explanation for this.. After we jumped the dead battery on my 645, the top wont go down, wiper stay on, windows dont work and every warning indicator is flashing.. what gives????? is there a system reset?

[NWS Alpine]

Did you jump the battery from the proper location like it tells you in the manual? The jump points are under the hood. If you jumped it from the trunk connected to the battery you might have damaged the car. Might need to see the dealer?

[gbnxio]

you know what, i did jump from the trunk.. I just disconnected the battery for 30 secs.. all is back to normal.. is that a usual occurrence for these cars?

[dannyc9997]

Once in awhile jump starting these cars will cause a voltage issue which can be solved by disconnecting the battery.

[NWS Alpine]

Once in awhile jump starting these cars will cause a voltage issue which can be solved by disconnecting the battery.

That is good to know for future ref. Thanks.

[Leslierc]

Someone should flag this thread as a must read. Years ago, I worked with a guy was a car enthusiast and amateur race driver. He once told me about how he had to roll/push his 7-Series out of his garage when the battery was dead in order to reach the connections for the jump-start points. He told me in this regard that BMWs can be badly damaged if not jump-started properly. [Something I remember him telling me to this day.] When you think about it, this makes perfect sense with all of the electronics in our cars. [Think about why we use surge-protectors for our computers and flat screen TVs. Too much direct power at one time can literally melt their components.]

[stuboat]

Well, I have an 08 650 vert which I jump started per the manual. It started ok but it would not hold the date and time. It also said in the service messages, if that happened I should take it to the dealer. I did and it had a bad cell. I have had the car since December 08 and have put only 2000 miles on it. The SA said such low usage is not good for the battery. They replaced under the warranty without any argument but told me they could have refused to do so because of the low usage. The SA suggested using a trickle charger overnight if I don't drive it more often and take a few trips beyond a few miles.

[Fast Bob]

Someone should flag this thread as a must read. Years ago, I worked with a guy was a car enthusiast and amateur race driver. He once told me about how he had to roll/push his 7-Series out of his garage when the battery was dead in order to reach the connections for the jump-start points. He told me in this regard that BMWs can be badly damaged if not jump-started properly. [Something I remember him telling me to this day.] When you think about it, this makes perfect sense with all of the electronics in our cars. [Think about why we use surge-protectors for our computers and flat screen TVs. Too much direct power at one time can literally melt their components.]

This "advice" is total BS....the electrical current flows through *the entire car* in the same way. ANY car can be damaged by an incompetent jump-start, not just a BMW...As long as you always follow proper procedure (the same as installing a battery, i.e., negative cable *removed first* and *replaced last*), you`ll be OK. If you want to be "super-safe", make sure the donor car is turned off....this way, you`re only jumping battery-to-battery, without the donor car`s electrical system being compromised (or adding to any potential problem).
And to the OP....leaving the battery in a discharged state for any length of time (more than a couple of days) is The Kiss Of Death....a battery on its last legs can cause *all sorts* of weirdness in a BMW....

[kous650]

I had the same problem, battery had a dead cell and dealer would not replace under waranty because they can tell in the memory if the battery had been on a charger. Also I only drive the car on the weekends, weather depending. My air bag and seatbelt light stayed on after jumping. So I had to buy me one.

I bought the battery tender model #021-0128 on Amazon, its the same model BMW sells for around $60 but has a direct connect disconnect cable. I installed the cable at the battery and I plug it for the week. Works great.

here's a link to the charger.

http://www.amazon.com/s/?ie=UTF8&keywords=battery++tender&tag=googhydr-20&index=aps&hvadid=2337211121&ref=pd_sl_2sc3ptjn_e

[Leslierc]

This "advice" is total BS....the electrical current flows through *the entire car* in the same way. ANY car can be damaged by an incompetent jump-start, not just a BMW...As long as you always follow proper procedure (the same as installing a battery, i.e., negative cable *removed first* and *replaced last*), you`ll be OK. If you want to be "super-safe", make sure the donor car is turned off....this way, you`re only jumping battery-to-battery, without the donor car`s electrical system being compromised (or adding to any potential problem).
And to the OP....leaving the battery in a discharged state for any length of time (more than a couple of days) is The Kiss Of Death....a battery on its last legs can cause *all sorts* of weirdness in a BMW....

Expressing an opinion here does/should not merit an "organic" -laden response. :tsk: This forum is a place to share experiences of BMW ownership and learn from and assist each other in the process.

[stuboat]

+1