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

The inductive antennas in the doors, the rear, the trunk and the rear bumper are actuated by the Keyless-Go control module (N69/5). Their electromagnetic fields cause the Keyless-Go transmitter card (A8/2) to transmit its authorization code via radio to the right antenna amplifier module (A2/65).

The transmitter card last used is checked first.

Moreover, it is determined by means of these inductive antennas, whether a Keyless-Go transmitter card (A8/2) is located inside or outside the vehicle.

The body sheet metal attenuates the antenna fields in the outer area limiting the range in a defined manner. The antenna range outside the vehicle is approx. 1 - 1.5 m, so that when outside the vehicle, the Keyless-Go transmitter card (A8/2) is reached only by the antennas 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 module (N69/5) to decide whether the Keyless-Go transmitter card (A8/2) is located inside or outside the vehicle.

Examples:

• If the Keyless-Go transmitter card (A8/2) is inside the vehicle, this is detected by the antennas at both sides of the vehicle. The Keyless-Go control module (N69/5) therefore "knows" that the Keyless-Go transmitter card (A8/2) is in the vehicle.
• If the Keyless-Go transmitter card (A8/2) is outside the vehicle, this is only detected by an antenna at one side of the vehicle. The Keyless-Go control module (N69/5) therefore "knows" that the transmitter card is outside the vehicle.