Structure and inner electrical connection

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All 4 pins at each plug connection are used. The outside pins are earth connections. The inner pins are supply voltage and signal cable. The two ground connection are connected on a board in the electronic module. Only 3 cables are used in the wiring harness.

Fig 1: Transmitter Aerial - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Transmitter aerial
2	Transmitter
3	Electronic component with evaluation electronics
4	Data interface

The wheel electronics system consists of a plastic housing. The plastic housing contains a printed circuit board and the following components:

Pressure sensor
Temperature sensor
Acceleration sensor
Transmitter/receiver unit
Evaluation electronics
Battery

Fig 1: Pressure Temperature And Acceleration Sensors - Circuit Diagram
Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Aerial with transmit and receive unit
2	Pressure, temperature and acceleration sensors
3	Battery
4	Evaluation electronics

Fig 1: Inner Electrical Connection - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Reception aerial
2	High-frequency receiver
3	Electronic component
4	Data interface