GMC 2004 Sierra 1500 Pickup Owner's Manual page 84

Canada with Passenger Sensing System
1-78
Canada without Passenger Sensing System
This switch should only be turned to AIR BAG OFF if the
person in the right front passenger's position is a member
of a passenger risk group identified by the national
government as follows:
Infant. An infant (less than 1 year old)
must ride in the front seat because:
•
my vehicle has no rear seat;
•
my vehicle has a rear seat too small to accommodate
a rear-facing infant seat; or