Cadillac 2007 XLR Owner's Manual page 56

The passenger sensing system is designed to
enable (may inflate) the passenger's frontal airbag
and side impact airbag anytime the system
senses that a person of adult size is sitting
properly in the passenger's seat. When the
passenger sensing system has allowed the airbags
to be enabled, the on indicator will light and stay
lit to remind you that the airbags are active.
For some children who have outgrown child
restraints and for very small adults, the passenger
sensing system may or may not turn off the
passenger's frontal airbag and side impact airbag,
depending upon the person's seating posture
and body build. Everyone in your vehicle who has
outgrown child restraints should wear a safety
belt properly — whether or not there is an airbag
for that person.
If a person of adult-size is sitting in the passenger's
seat, but the off indicator is lit, it could be because
that person is not sitting properly in the seat. If this
happens, turn the vehicle off and ask the person to
place the seatback in the fully upright position, then
sit upright in the seat, centered on the seat cushion,
with the person's legs comfortably extended.
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Restart the vehicle and have the person remain in
this position for about two minutes. This will allow
the system to detect that person and then enable
the passenger's frontal airbag and side impact
airbag.