Toyota 2011 Matrix Owner's Manual page 139

2-1. Driving procedures
■
Changing engine switch position
116
"LOCK"
The steering wheel is locked
and the key can be removed.
(Vehicles with an automatic
transmission: The key can be
removed only when the shift
lever is in P.)
"ACC"
Some electrical components
such as the audio system can
be used.
"ON"
All electrical components can
be used.
"START"
For starting the engine.