Chevrolet 2007 Silverado 1500 Pickup Owner's Manual page 274

If this message is on, but there is no reduction in
performance, proceed to your destination. The
performance may be reduced the next time
the vehicle is driven. The vehicle may be driven at
a reduced speed while this message is on, but
acceleration and speed may be reduced. Anytime
this message stays on, the vehicle should be
taken to your dealer for service as soon as
possible.
RIGHT REAR DOOR AJAR (Crew Cab)
If the passenger's side rear door is not fully
closed, this message will appear on the display
and you will hear a chime. Stop and turn off
the vehicle, check the door for obstructions, and
close the door again. Check to see if the message
still appears on the DIC. Pressing any of the
four DIC buttons will acknowledge the message
and clear it from the DIC display. If your
vehicle does not have the four DIC buttons,
pressing the trip odometer reset stem will
acknowledge the message and clear it from the
DIC display.
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SERVICE 4WD (Four-Wheel-Drive)
If a problem occurs with the four-wheel-drive
system, this message will appear on the DIC. If
this message appears, stop as soon as possible
and turn off the vehicle. Restart the vehicle
and check for the message on the DIC display. If
the message is still displayed or appears again
when you begin driving, the four-wheel-drive
system needs service. See your dealer.
SERVICE AIRBAG
If there is a problem with the airbag system, this
message will be displayed on the DIC. Have
your dealer inspect the system for problems. See
Airbag Readiness Light on page 245 and
Airbag System on page 92 for more information.
Pressing any of the four DIC buttons will
acknowledge the message and clear it from the
DIC display. If your vehicle does not have the four
DIC buttons, pressing the trip odometer reset
stem will acknowledge the message and clear it
from the DIC display.