Description And Operation: Description: Antennas

Inductive antennas in and at the vehicle are used to transform the current, driven by the IBU antenna driver, into a 125 (or 134.2) kHz magnetic field, which is the carrier for the SMART KEY challenge. Five antennas cover the vehicle's exterior: four antennas in the Door Handles (DS and PS) cover the area around the doors; one antenna in the rear bumper covers the area around the trunk or tailgate. Up to three antennas cover the vehicle's interior and the trunk or tailgate interior: two in the passenger compartment and one in the tailgate room or trunk.

The Immobilizer Backup Antenna is used for sending and receiving data: it emits a magnetic field (125 - 135 kHz challenge) and receives changes in the field strength (response of Transponder).

The SMART KEY FOB's response is received via the external RF receiver, which is connected to the IBU via a serial communication Line. The IBU provides a connector pin for the serial communication Line.