No start and alarm goes off..
 

Just had my battery changed on my 04 X5 4.4.....
car was fine for four days..Go to start it last night and would not start and alarm goes off...

I had this no start problem 6 months ago...From what I understand a computer board was changed which is located under the dashboard...

Same thing a few weeks ago...No start and alarm goes off....Changed battery..Fine for four days than the same nonsense..

Getting frustrated..

What scan tools do you have.sounds like your EWS system is not decoding your key and thinks somebody is using a screwdriver to start the car.

You need to read the ews module. Usualky of I get a false alarm I can put the key in either the ignition or the door and turn the key a couple times and it stops the siren. Did you do something to stop the siren?

Will show what you sent me to my mechanic....When the alarm goes off I step outside the car and use the key to lock the door and alarm goes off..

I spoke to him this morning ( got stuck late last night ).He suggested that I place key in the on position and leave it for like 20 minutes, than try to start the car..

"goes off" usuaky means starts making sound that's why I used the exact phrase above. You stopped the alarm by using the key in the door.

That's a good sign that the key isn't broken and that the EWS is functional. I would suspect the key antenna around the ignition .

Not sure what he's expecting to change with the key in the on position, that will charge the key battery but that is not used for ews.

EWS stands for "D rive A way P rotection"

I've always wondered what the letters meant. It makes more sense in German:

Electronische Wegfahrsperre

http://www.unofficialbmw.com/images/BMW_EWS.pdf

That article could be of major help in flushing out your bug.

How I long for the days when keys were just small pieces of metal, not stuffed with electronics....Will run this by my mechanic...

Keep us posted I've seen similar problems ended up being the key antenna. One other thing is to make sure the MID code is not set. Would appear on the MID I think as asking for an unlock code on the radio interrace


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Just on the off chance...

Check your hood switch for the alarm (don't ask how my neighbors know)

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No start and alarm goes off..
 

Hood switch is a known issue for random alarm. Alarm should be deactivated when door is open but it wasn't clear if key was used to unlock door or remote so whichever it was try the other.

BTDT... recently too. :rolleyes:

Are your neighbors back on speaking terms now? Took a month for mine to get over their butthurt [emoji16]

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Ok used key fob to open door...Pressed it twice to unlock all doors before I tried to start it...

Will show these posts to my mechanic..Not familiar with scanners or electric..

Will keep posted...

For some reason, mine only ever went off at work. I think it was related to heat, sitting in the hot sun during the day. :dunno:

Here's some info that might help...

Central Body Electronics...
http://www.rfdm.com/Daniel/MRoadster...lectronics.pdf

EWS System...
http://www.rfdm.com/Daniel/MRoadster...us/pdf/EWS.pdf

I know you just changed your battery...but I'd suggest double checking/verify that it (the battery) is still around 12 volts (or at least at or above 11.89 volts). What if you have something draining the vehicle's battery?

Also verify that both negative and positive battery terminals are snug around each battery terminal's post. Sometimes a new battery doesn't get one of the terminals fitted properly.

The above suggestions are based on that you wrote you have a NO START situation and the ALARM SIREN is going off. The alarm siren has its' own internal battery...so if the car is disconnected from its power source (like in a theft attempt) the alarm siren can still sound off. But if the car's battery is discharged...and the car is armed...this can trigger a false alarm as the low voltage situation makes the alarm think someone is disconnecting a power source.


The above situation can also come from the alarm siren's internal battery being discharged or failing due to the car's battery not being able to keep it charged up. Again, this could cause false triggering.

That's some good advice also confirm you have voltage at the B+ jump start terminal (no blown BST).


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