See also:

Power-Up
After switching the ignition key from OFF to either the ON or ACC position, or after a language change, you must wait at least five seconds prior to using the system. ...

Tire Chains
Tire chains may be installed on all models except the Sahara and Rubicon. Install chains on rear tires only. Follow these recommendations to guard against damage and excessive tire and chain wear ...

Cruise Control
Press and release the UP or DOWN button until ACC (if equipped with Adaptive Cruise Control) or Cruise is highlighted in the EVIC. Status of the ACC or Cruise is displayed in the menu line also. ...