2005 GMC Sierra 1500 Pickup Owner's Manual - Page 201

When you turn the right front passenger's airbag off, this light will come on and stay on to remind you that the airbag has been turned off. This light will go off when you turn the airbag on. {CAUTION: If the airbag readiness light ever comes on when you have turned off the airbag, it means that something may be wrong with the airbag system. The right front passenger's airbag could inflate even though the switch is off. If your vehicle is a regular cab pickup and this ever happens, do not let anyone whom the national government has identified as a member of a passenger airbag risk group sit in the right front passenger's position (for example, do not secure a rear-facing child restraint in your vehicle) until you have your vehicle serviced. If your vehicle is an extended cab pickup and this ever happens, do not let anyone whom the national government has identified as a member of the passenger airbag risk group sit in the right front passenger's position (for example, do not secure a rear-facing child restraint in the right front passenger's seat) until you have your vehicle serviced. {CAUTION: If the right front passenger's airbag is turned off for a person who is not in a risk group identified by the national government, that person will not have the extra protection of an airbag. In a crash, the airbag will not be able to inflate and help protect the person sitting there. Do not turn off the passenger's airbag unless the person sitting there is in a risk group. See Airbag Off Switch on page 1-73 for more on this, including important safety information. 3-35