My 2006 volvo s40 has been a great car without problems until the other day. I was driving down the road and all of a sudden the interior lights come on the windshield wipers turn on, sevral messages appear on the dash Service urgent, Left door open, SRS Warning etc.
Now hardly anything works on the car the engine runs fine and is fine to drive.
The problems that remain are: the windshield wipers will not turn off, none of the power windows or sunroof will open or close, power door locks do not work, key fob remote doesnt respond, interior lights will not turn off, turn signals do not work, SRS Urgent service message on dash will not go away basically just a bunch of electrical problems of some sort.
has anyone else had a problem similar to this? Or have any idea what the problem could be?

 

Start with a thorough examination of the fuses. When one goes out the power has a tendency to back-feed through other circuits causing strange issues.

Also, check that your alternator is charging the battery. Start the car and check that the battery is getting ~14.4 volts. Low voltage from a bad alternator, bad or corroded grounds, etc can also cause issues.

Check the simple, free stuff first before plunging into more expensive stuff.

 

This happened to me however I cant even get the car to turn over it won't even eject my key!!! My battery is good with a reading of 12.8 idk man I'm sorry I feel for you.

 

Just trace from the battery down through and to the fusebox to see where that battery voltage goes away. The problem will be between the point you DO have voltage and the point you DON'T have voltage. It might be helpful to turn on the headlights to apply a load (even a bad connection will potentially supply full voltage if there's no load on the circuit). It is the same for the starter circuit (the big red cable going to the starter, but it's not supplying power to anything else).

 

After work I'm going to try it out although I feel as if I did this but I may have done it wrong
will a bad alternator be a reason why I got no power what so ever ?

 

A bad alternator won't charge the battery, so it will eventually go dead, causing issues like you're seeing. However, if the battery is really reading over 12 volts, it should be starting the car, and it won't be the battery causing all the other glitches.