To turn the system off

Push the OFF button.
See also:
Volume control switches
Push the upper (+) or lower (−) side switch to increase or decrease the volume. ...
Three-way catalyst
The three-way catalyst is an emission control device installed in the exhaust system. Exhaust gases in the three-way catalyst are burned at high temperatures to help reduce pollutants.
WARNING
...
Going & Stopping
The M35 should be fine for most drivers, as Infiniti tuned its V-6 this year
for more high-revving horsepower — an impressive 303 hp, to be exact — but less
torque, which is the low-end grunt you ...
