Horn
Press 
on the steering wheel pad to sound the horn.
See also:
Engine Air Cleaner/Filter
See Engine Compartment Overview for the location of the engine air
cleaner/filter.
When to Inspect the Engine Air Cleaner/Filter
Inspect the air cleaner/filter at the scheduled maintenance inte ...
If the System Needs Service
If the navigation system needs service and the steps listed here have been followed
but there are still problems, see your dealer for assistance. ...
When the System Does Not Seem to Work Properly
The following messages may be displayed on the DIC:
SERVICE PARKING ASSIST:
If this message occurs, take the vehicle to your dealer to repair the system.
PARK ASSIST OFF: If the UFRPA system ...