BMW 7 Owners & Service Manuals

BMW 7 Series: System Overview

The following pages show the input/outputs and the schematic circuit diagrams of the F01/F02 voice input and activation systems.

The driver's side microphone is the only device used for voice input.

Voice input is always activated by pressing the PTT button (push-to-talk button) on the steering wheel.

The control units, sensors, control elements and components involved in the system are shown in the input/output diagrams. A block diagram representation of a specific control unit is additionally shown.

The input/output diagram provides an overview of the system in the form of a signal flow diagram. It does not indicate whether the signals are sent via busses, other control units, hard wiring or by wireless means. This detailed information can be found in the schematic circuit diagram.

The graphic representation is always followed by the corresponding legend which can be found either under the graphic or on the next page.

For the sake of clarity the various individual speakers are not shown in the schematic circuit diagrams.

Inputs/outputs, Voice Activation System

Voice Activation System
Fig. 38: Voice Activation System Inputs/Outputs System Diagram


  1. Instrument cluster
  2. Central information display (CID)
  3. Other controlled systems such as DVD changer
  4. Wheel speed sensor
  5. Speaker
  6. Microphone (driver's side)
  7. Car Information Computer (CIC)
  8. Central gateway module (ZGM)
  9. Multifunction steering wheel (MFL)

The voice input function is always implemented in the CIC.

The DVD changer serves as an example of the other voice-activated systems that can be controlled.

The wheel speed signals are used for speed- dependent volume control.

Volume can be adjusted by means of the multifunction steering wheel and the IHKA/audio control unit. Speedrelated volume control is also active.

The microphone is connected to the TCU and the telephone commands are processed by the telephone control unit and made available on the MOST bus.


Voice Activation System

Schematic Circuit Diagram for the Voice Activation System with TCU

Voice Activation System
Fig. 39: Circuit Diagram For Voice Activation System With TCU


  1. Central gateway module (ZGM)
  2. Central information display (CID)
  3. Car Information Computer (CIC)
  4. Fuse in the junction box
  5. Controller (CON)
  6. Baseplate with snap-in adapter
  7. Roof antenna
  8. Fuse in fuse carrier at rear
  9. Telematics control unit (TCU)
  10. Bluetooth antenna
  11. Microphone (driver's side)
  12. Steering column switch cluster (SZL)

MOST signals at TCU


Voice Activation System


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