Hi all, long time forum viewer, first time poster. I am wondering if anyone knows how to make the cigarette lighter power stay on even when the car is turned off in a 2003 C240. I have seen some forum posts regarding this in the E-class, but I am not sure if the idea is the same in my car. Can anyone point me to some documentation or have knowledge of this?
As cars vary you need to take a meter & find a tap in the fusebox that has a wire going to it as fat as the one going to the cig lighter & make sure it does not go to sleep with the CANBUS. Then run a new wire from there to the cig lighter. This requires some careful stripping of the dash & console to feed a new wire.
If your car was prewired for a cell phone then the wiring will be there already at the side of the console. Only Benz can tell you from your VIN whether the car is prewired.