Antenna ring

Fig 1: Identifying Antenna Ring On Ignition Switch

Courtesy of VOLVO CARS OF NORTH AMERICA.

The antenna ring (16/65) is installed around the ignition switch. The antenna ring is used to allow the central electronic module (CEM) to communicate remotely with the ignition key.

The antenna ring comprises a modulation circuit and a communication circuit. The modulation circuit converts signals between the central electronic module (CEM) and the communication circuit. The communication circuit is used to communicate with the key.

When the central electronic module (CEM) activates the antenna ring, a magnetic field is generated around the antenna ring. This magnetic field is converted in the key to an electrical current, which means that the key does not require further electrical supply.