For reasons too complicated to explain, I am looking for a way to detect when the infotainment system is switched on. By switched on I don't mean receiving power. I can detect the ignition being on. What I am looking for is a low power circuit (preferably external to the device) which is switched by the driver pressing the ON knob. I am thinking perhaps there is something in the wiring to the remote module in the glove box. Any ideas?
Thanks