See also:

Low speed automatic cancellation
ACC is not functional at vehicle speeds below 18 mph (30 km/h). Once the vehicle speed drops below 18 mph (30 km/h), an audible alarm will sound, the head’s up display will flash and the automatic ...

Troubleshooting
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Navigation system/SYNC hands free control features (if equipped)
Navigation system/SYNC hands free control features (if equipped) Press control briefly until the voice icon appears on the Navigation display to use the voice command feature. Pres ...