BMW 318i SE Auto Start-up/Electrical/Immobiliser Problem

If anybody could tell me what is causing this is be very happy! Car was working fine last night then suddenly today these problems seem to come out of no where. Not sure what's causing it to be honest... Help??
Also, when I lift the camera up to show the wall, it's because even though the headlights are in the off-position - for some reason they switch on when the engine runs for a couple seconds! This has never happened before either...

[@4DIYers]

Battery issue by the sounds of it, my BMW did a similar thing. BMWs are known to do all kinds of weird things when the battery isn't providing the power that's needed for the car. Either try cleaning the battery posts and give it a charge. Or it might just be time for a new battery too.

[@blackmasta71]

Try checking the immobilizer fuse under the hood in the fuse box.. My car would light the dash but not crank over what so ever because that fuse blew.

[@motorsport_doc]

Get a decent code reader somewhere and check for faults, post em up here then we'll see.
Try doing a battery reset, disconnect the ground leave it off for about 30min the reconnect it.

[@DaleHubbardLicksBall]

Turned out to be the ECU itself which had supposedly 'entirely physically degraded' ... expensive isn't even the word.

[@ant-hu1gs]

hey i was wondering what was the problem and how did you figure it out I'm having the same issue with my car thanks

[@iyadnasser7976]

it is the Battery or supply wires and cables please chech them i got prob. like that befor not exactly like this but look like it and it was battery cable
good luck

[@shivani3743]

Had the same problem it was key at the end had a spare key now my car is starting up thought it was the battery it took RAC an hour to sort out the problem new key from the dealer is £160

[@luckyramosedi3576]

you have lot of time to play

[@user-lc4wh8xw5e]

Car needs mobile connect connected. To keep car functioning correct.
Stolen car do that too.

[@rabban89]

check main power/fusebox wiring under floor on passengerside.

[@DjordjeSrpski]

easiest solution for this is to lock your doors and then it should then ignite perfectly.
so once the problem occurs don't take out key just press middle button to lock the doors and try again to ignite.

[@dannychoi1731]

Video Production Company n

[@rossivory5572]

Mine was similar problem was alternator, hence the Colt drop when the Car managed to start up

[@johannesjojo6578]

i have a same problem

[@austinmoshiogola]

Check your alternator....

[@iyadnasser7976]

this is not immobiliser fult

[@turbopatagonia]

change the battery, bye

[@joelock7691]

Wht battery?