Buick 2007 Terraza Owner's Manual page 240

PASSENGER'S REAR DOOR AJAR
This message displays when the passenger's side
rear door is not closed properly. When this
message appears, make sure that the passenger's
side rear door is closed completely.
This message displays while the ignition is in
RUN. A chime sounds when the ignition is shifted
out of PARK (P). Press any of the DIC buttons
to acknowledge this message and to clear it from
the screen.
This message continues to display for two seconds
if it has not been acknowledged when the engine
is turned off. It also re-displays for two seconds if
the message has been acknowledged, but the
condition still exists when the engine is turned off.
If the condition still exists, the message re-appears
when the engine is turned on.
240
PASSENGER SEATBELT IS NOT
FASTENED
This message reminds you to buckle the
passenger's safety belt.
This message displays and a chime sounds
when the ignition is on, the driver's safety belt is
buckled, the passenger's safety belt is unbuckled
with the passenger airbag enabled, and the
vehicle is in motion. You should have the
passenger buckle their safety belt.
The reminder will be repeated if the ignition is on,
the vehicle is in motion, the driver is unbuckled
and the passenger is still unbuckled and the
passenger airbag is enabled. If the passenger's
safety belt is already buckled, this message
and chime will not come on.