See also:

Restoring the factory settings
•► Press the and buttons simultaneously for approximately six seconds until the battery check lamp flashes twice. ...

Cordless headphones for the front passenger
There are different cordless headphones for the front passenger and the rear compartment. The cordless headphones for the front passenger can be identified by SPLITVIEW symbol 1 on the head ...

Checking the battery
Press the or button. The battery is working properly if battery check lamp 1 lights up briefly If battery check lamp 1 does not light up briefly during the test, the battery is dischar ...