Chevrolet Uplander Owner's Manual page 212

PASSENGER'S DOOR AJAR
This message will display when the front passenger's
door is not closed properly. When this message
appears, you should make sure that the front
passenger's door is closed completely.
This message will display while the ignition is in RUN.
A chime will sound 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 will continue to display for two seconds if
it has not been acknowledged when the engine is
turned off. It will also re-display 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 will re-appear
when the engine is turned on.
PASSENGER'S REAR DOOR AJAR
This message will display when the passenger's side
rear door is not closed properly. When this message
appears, you should make sure that the passenger's
side rear door is closed completely.
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This message will display while the ignition is in RUN.
A chime will sound 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 will continue to display for two seconds if
it has not been acknowledged when the engine is
turned off. It will also re-display 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 will re-appear
when the engine is turned on.
PASSENGER SEATBELT IS NOT
FASTENED
This message reminds you to buckle the passenger's
seat belt.
This message will display and a chime will sound when
the ignition is on, the driver's seat belt is buckled, the
passenger's seat belt is unbuckled with the passenger
airbag enabled and the vehicle is in motion. You should
have the passenger buckle their seat 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 seat belt is already
buckled, this message and chime will not come on.