See also:

Rear Differential Fluid
4WD model only The rear differential should be drained and refilled with new fluid according to the maintenance messages shown on the information display. Have your dealer replace the rear differ ...

Operating the System
If you do not operate the    system from the front panel for more than 20 seconds, the indicator in the button goes off, and the front display returns to what has previously been displayed ...

Using HFL
HFL Buttons   (Pick-up) button: Press to go directly to the Phone screen or to answer an incoming call.   (Hang-up) button: Press to end a call.   (Talk) button: Press to call ...