Electrical system assembly for a motor vehicle

A motor vehicle, comprising:

• at least two electrical consumers;
• at least one electrical system assembly for supplying electrical energy to the at least two electrical consumers, the at least one electrical system assembly including:
• a first electrical system;
• a second electrical system galvanically isolated from the first electrical system, the second electrical system switchable between an idle state and an active state;
• a capacitive coupling element in communication with the first electrical system and the second electrical system, wherein the first electrical system is capacitively coupled to the second electrical system via the capacitive coupling element for transmitting signals;
• a signal transmitting unit coupled to the first electrical system and communicating with an input side of the capacitive coupling element, wherein the signal transmitting unit is configured to transmit an activation signal to the input side of the capacitive coupling element for activating the second electrical system from the idle state to the active state;
• and
• a signal receiving unit coupled to the second electrical system and communicating with an output side of the capacitive coupling element, wherein the signal receiving unit is configured to switch the second electrical system from the idle state to the active state in response to receiving the activation signal
• wherein the at least two electrical consumers are electrically connected to one another via the first electrical system and second electrical system, of the at least one electrical system assembly;
• and
• a joint electric energy supply unit arranged in the second electrical system, wherein the joint electric energy supply unit is electrically isolated from the second electrical system in the idle state and is electrically connected to the second electrical system in the active state.

A method for activating an electrical system of an electrical system assembly, comprising:

• connecting capacitively a first electrical system to a second electrical system via a capacitive coupling element, wherein the first electrical system is galvanically isolated from the second electrical system, and wherein the second electrical system is switchable between an idle state and an active state;
• transmitting an activation signal of a signal transmission unit arranged in the first electrical system to a signal receiving unit arranged in the second electrical system via the capacitive coupling element;
• and
• switching the second electrical system from the idle state to the active state in response to the signal receiving unit receiving the activation signal, wherein an electrical current in the second electrical system is at least one of interrupted and reduced in the idle state with respect to the active state.