Question about 2003 BMW M3

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2003 BMW M3 Convertible - won't start - electrics dead

I have a 2003 BMW M3 Convertible. Using it last weekend I tried to put the roof up after parking up and nothing happened. I tried to restart the car and nothing happened. All electrical power appeared to have gone. I called a recovery firm and they assisted jump starting and told me to drive it for a while - I did for approx 2hrs solid. I just tried it again today (3days later) and again it doesn't start. When I turn the key to possition 1 or 2 no lights come on on the dash. I am guessing the battery has died but was wondering if there is a chance of a loose connection and hoping it isn't anything worse! Any ideas?

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  • Master
  • 784 Answers

Main cable from battery has a joint in front footwell check this

Posted on Apr 28, 2017

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Posted on Jan 02, 2017

  • 87 Answers

SOURCE: 2002 BMW 325i - engine won't turn over / start.

take battery back get a new one or have it tested. like auto zone or a parts store even wal-mart now. If this battery was just dead and needed charged. Then sounds like to me you have a bad alternater. you can rely know if you can get the battery charged up and get the car to start. and while the car is running pull the positive connection of the battery if car dies bad alternater .

Posted on Jul 12, 2008

bmw_tech_38
  • 113 Answers

SOURCE: 5 series Battery drain.

Hi, you will need to remove the passenger side kick panel under the dash then you will be able to see the side of the heater box, you should be able to see a black milti plug with a 2.5mm red and white wire, if you unplug this you will see the casing for the resistor, this just un clips from the heater box and remove, replacement is just the reverse, hope this helps or if you get stuck just ask for more help, mark.

Posted on Apr 10, 2009

Testimonial: "thanks for all the help."

inhisname
  • 76 Answers

SOURCE: Can a weak battery cause a BMW to misfire?

hello, if the vehicle ran with cable off one would ASUME alternator is ok! however, i bad diode in the aletnator would allow it to charge yet have a massive voltage draw as well, almost all of todays parts stores will do a free starting and charging test for you! ......ps a large voltage drop would rob your ignition of voltage causing your miss!.good luck, marty

Posted on Jun 07, 2009

  • 11 Answers

SOURCE: I just purchased a 2003 M3 and the convertible top

Hi,

Open the boot / trunk. There is a part where the roof is stored when it is down, that can be raised to create more trunk / boot space when the roof is up. Grab the handle and make sure it is fully pulled to the back to make sure that the roof can be stowed correctly. If this is not fully back, or there is something pressing against it in the boot, the roof will not operate. The trunk needs to be closed before operating the roof too.

Posted on Dec 23, 2010

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    The reason the roof is not working anymore as soon as there is stress on the roof the electric motors(One operates the roof and the other operates the roof lid)  disengages, You said that the roof still worked but the lid did not so probably only the one motor disengaged. So what you have to do is open the trunk on the left hand side right behind the tail light pull away the material and simply just push the electric motor into place. that should fix your problem.

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