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 fifteen seconds prior to using the system. ...

Air Bag Warning Light
The light should come on and remain on for four to eight seconds as a bulb check when the ignition switch is first turned ON. If the light is not lit during starting, see your authorized dealer. ...

Replacing The Batteries
Each set of headphones requires two AAA batteries for operation. To replace the batteries: • Locate the battery compartment on the left ear cup of the headphones, and then slide the battery cov ...