Keyless Go antenna, function - GF82.62-P-4100-04SM

The inductive antennae in the doors, in the rear, in the luggage compartment and in the rear bumper are actuated by the Keyless Go control unit (N69/5).

Their electromagnetic fields cause the transmitter key (A8/1) to transmit its authorization code via radio to the right antenna amplifier module (A2/12).

The transmitter key used last is interrogated first.

In addition via these antennae it is established whether transmitter card is outside or inside the vehicle.

The body sheet metal attenuates the antenna fields in the outer area limiting the range in a defined manner. The range of the antennae outside the vehicle is approx. 1 - 1.5 m. As a result the transmitter card outside the vehicle can always only be reached by the antennae on one side of the vehicle.

On the other hand, these range sectors overlap in the interior.

This defined range limitation allows the Keyless Go control unit (N69/5) to decide whether the transmitter key is located inside or outside the vehicle.

Examples: 

• Transmitter card located inside the vehicle Transmitter card recognized by antennas on both sides of the vehicle. The Keyless Go control unit (N69/5) therefore "knows" that the transmitter key is in the vehicle.
• The transmitter key is located outside the vehicle The transmitter key is only detected by antennae on one side of the vehicle. The Keyless Go control unit (N69/5) therefore "knows" that the transmitter key is in the vehicle.