My BMW 116i SE seems to have a mind of its own, the car is locked and nothing has been left on but the alarm goes off repeatedly sometimes making a noise and others just the lights going off. I replaced the battery a few weeks ago but the problems persisted and now drained the new one. Why is this happening I've had the car a year and the problem has just started over the last couple of months.

SOURCE: BMW X5 Battery Drain.

hello theringbar, I would recommend checking the a/c blower resistor. it is an electronic final stage and can kill the battery overnight. the final stage is located on the passenger side at the back of the a/c heater box.

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.

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SOURCE: 2003 BMW Car Alarm keeps going off

Hi , you can lock your car without activating the allarm by using the key to lock your car manually ( not the remote ) , the most common alarm fault on this car is the hood switch, if you change this buy one for a bmw Z4 model which is slightly longer and garrentees a contact when the hood is closed, hope this helps regards mark

Colin Stickland

• 22516 Answers
• Posted on Aug 05, 2009

SOURCE: E36 BMW 318I CENTRAL LOCKING

try locking and unlocking the car with the key 3 times slowly ,other than that i have no idea ?? another trick is to disconnect battery and join the cables together for a few minutes to discharge any capacitors that may be holding a charge in the computer..Only other thing i can think of is the main dealers who have the right connectors and software to re set it all .sorry i havent been of any help

SOURCE: 2003 BMW 325xi won't start, dashboard and radio go on.

My 2003 325xi died on the highway a few weeks ago, and I thought it was the battery. It turned out to be the alternator, which was an expensive problem to repair. If your battery is new, it could be the alternator, or a problem with the electrical system. I find the BMWs to be too complicated electrically, which often leads to problems! I'd check your alternator...