With the growing number of cars with automated driving features and due to new legislation, the demand for Driver Monitoring Systems (DMS) is increasing significantly. Adding a new system in a vehicle introduces the challenge of increased space, cost and weight. As the wiring harness in the vehicle is already one of the heaviest and more expensive components, adding a new system is further increasing the cost and weight impact due to additional cabling needs. This application note presents a design approach to reduce the amount of cabling needed for a driver monitoring system by using Power-over-Coax (PoC).