Start problem I couldn't start my BMW 120 in this morning. When I inserted remout control in the slot, the dash left dark, no any lights went on. I checked the battery - is was 12.3 v. Remout control itself works OK. It opens and closed doors without a problem. The radio also works OK. But I noticed that there is no "click" sound which it usually is when the remout control comes into the slot. I checked fuses for Start/Stop button, there are all OK. Any idea what it can be?

Question edited to what I think, you thought you were saying :>D
Question moved to model category.

All vehicles need 2 good keys.

I don't suppose you have a way of testing the battery voltage? It is drops below 11 volts, nothing works the way It should, including removing the key on a vehicle that is an automatic.

You have the symptoms of a car alarm and immobilizer stopping it starting. After disconnecting the battery, it definitely need resetting. You need a mobile auto locksmith you cut you a new key and program both keys to make it start. People always think they only need one key because they are careful and won't lose it. Then they do and you either pay dealership prices for a key to be made based on the VIN number, or you buy a new lock and keys and have the hassle of fitting it and reprogramming it.

https://www.google.com/search?q=auto+locksmith+near+me

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I would suspect a ground problem in the dash area. Has there been any repairs done recently? Try to hook up an external ground, A long wire with 2 alligator clips , Make sure one end has a good ground and start connection the other to medal parts in the cab area.

I would imagine that the can controller is built in to the dash . Need to send it away to be repaired before u look at anything else.

a lot of new bmw needs programming when install a new battery.

new battery need to programmed with the car's ecu

check the daylight control module and if it is adjustable then reset it . If it is controlled by a light metre the replace that unit.

sounds like the key may be worn out..check the appearance of it if it is worn a little smooth that could cause the problem you're describing.

the key lost synchronization with the the computer. its a common problem with these new high security systems they're very sensitive. this made the battery die, next step is to take the car to the dealer, dont try to start the car anymore. if you have any questions call Priority Automotive Locksmith 866 999 7858

I took a quick look but couldn't find your model but in a BMW you have a "Dynamic Stability Control" which is for controlled driving in bad situations basically. Now like I said I couldn't look up your exact model but look in your vehicle for a button on the dash/radio/instrument cluster. The button you want to find should be marked "DSC" which turns this control on or off manually. You may have hit that button by accident. Push it and it should turn the system back on. If that doesn't work it means you have a problem in the DSC and it is not working. If this is the case unless you are a BMW mechanic, you need to take it to someone who is to take care of it. It's no real danger like the brakes are out but the handling will be limited to what it used to be. That's what both those lights on together mean. I hope this helps and good luck.

have your charging system checked to make sure alternator is charging to specs, also make sure no light are left on, (trunk light ,glove box mirror light.it sounds like you may have a draw somewhere, may be alternator or something is on, hope this is helpful.

Take the battery out and have it charged up. reinstall it and you should be allright. Your car has discharged it completely, and it will need a recharge to start. The gauge is only measuring voltage, and not the status of charge.