Antenna ring
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Volvo V70, 2006 Volvo V70, 2005 Volvo V70, 2004 Volvo V70, and 2003 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
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.