David Pagan

So I have a 07 S550 and i have a serious problem. Key Fob is fine, but when i try and unlock it with it. It doesnt work. I use the metal key to get in all the time. I noticed as soon as i step into the vehicle all interior lighting and dashboard lighting is off. Electrical issue?

i place the key into the ignition and everything turns on without turning the key to start.

The car starts right up but every setting i have conducted thru the radio has been reset.

As i turn off the car with the key still in it all the lightings are still on but as soon as i pull the key out not even 4 seconds later ALL THE LIGHTING SHUTS OFF!!!

I try and use the keyfob to lock the car. No response.

The keyfob only works when its in the ignition...

Wtf is going on???

David Pagan

Anybody?

DaveW68

The accessory battery in your trunk is dying or dead.

MercMuscle

I second the accessory battery going bad but what is up with the ghost ignition?? That is strange....

David Pagan

Exactly my point. I soon as i put the key in without turning it, i hear the clicking of the computer turning on, and all components within the car turns on. As soon as i pull it out. 4 seconds later BOOM, everything is out. As if there was a power outage on your street.

DaveW68

The starter and accessory batteries are linked together under the hood. My guess is that as soon as you insert the key, it switches over to the starter battery. I bet if you put in a new accessory battery, all will be fine in the world again.