Control Assembly: Application and ID

The new AAC pushbutton control module (N22) is equipped with a K1 serial interface (data bus from instrument cluster to pushbutton control module) and K2 (data bus from pushbutton control module to instrument cluster).

The following signals are transmitted via the K1 serial interface:
- Outdoor temperature
- Coolant temperature
- Vehicle speed
- Engine speed
- Illumination (circuit 58d)
- °F/°C
- Full load cut-off (diesel)
- Acceleration recognition (gasoline)

The following signals are transmitted via the K2 serial interface:
- Refrigerant pressure
- Idle speed increase (gasoline)