darnell moore

I have a 2007 550I that was driving fine. I took her out, gassed up and came home. The next morning she wouldn't start. When start button is pushed the power comes on but nothing from the engine. When start button is pushed it seems every malfunction message such as, transmission malfunction, dynamic drive, passenger restraint system, steering wheel lock and I'm sure there are others that I can't remember. Also I connected a scanner to ODB2 and it won't connect to the car. Please help.

donpb

What's your battery voltage under load?

Chris Mac

Try unplugging the little blue connector in your trunk. It should be a wire coming off the negative terminal on the battery.
if it starts after that is unplugged then your IBS is bad.
Its worth a shot.

donpb

Yes I was going to say check that too but only after he verifies the battery voltage under load.

darnell moore

Do you mean just turn it on and measure voltage.

donpb

What is your battery voltage when the car is OFF?

darnell moore

Under load voltage is 11.88 and no load is 12.1.

darnell moore

Under load voltage is 11.88 and no load is 12.1.

darnell moore

Voltage load off is 12.1.

donpb

Do you have a charger? Charge the battery fully and then disconnect the IBS like the other member suggested. You'll see the long covered wire coming off of the IBS on the negative terminal.