The warning light on the dial turns on (on certain versions together with the message on the display) when one or more doors, the boot (indication fitted on some versions only) or the bonnet are not properly shut.
Symbols 
shown on the multifunction
display indicate incomplete left/right door closing.
With doors and boot open, if 4 km/h speed is exceeded the buzzer will sound (only for versions with reconfigurable multifunction display).
IMPORTANT On versions not fitted with electric door lock, no warning message will be displayed if door is not perfectly closed or is left open.
See also:
Audio repetition (Audio Rpt.) (where provided)
With this function the display repeats information relevant to the Radio (selected
radio station frequency or RDS message, automatic tuning or AutoSTore), audio CD
(track number).
...
Activation
The sensors are automatically activated when the reverse gear is engaged.
The sound produced by the acoustic alarm becomes louder when the distance between
the car and the obstacle decreases. ...
Operation
When the shift lever is in the AutoStick position (to the left of the Drive position),
it can be moved forward and rearward. This allows the driver to manually select
the transmission gear being u ...