Chevrolet 2009 HHR Owner's Manual page 72

If the vehicle does not have a rear seat that will
accommodate a rear-facing child restraint, a rear-facing
child restraint should not be installed in the vehicle,
even if the airbag is off.
The passenger sensing system is designed to turn off
the right front passenger frontal airbag if:
•
The right front passenger seat is unoccupied.
•
The system determines that an infant is present in
a child restraint.
•
A right front passenger takes his/her weight off of
the seat for a period of time.
•
Or, if there is a critical problem with the airbag
system or the passenger sensing system.
When the passenger sensing system has turned off the
right front passenger frontal airbag, the off indicator
will light and stay lit to remind you that the airbag is off.
See Passenger Airbag Status Indicator on page 3-31.
The passenger sensing system is designed turn on (may
inflate) the right front passenger frontal airbag anytime
the system senses that a person of adult size is sitting
properly in the right front passenger seat. When the
passenger sensing system has allowed the airbag to be
enabled, the on indicator will light and stay lit to remind
you that the airbag is active.
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For some children, including children in child restraints,
and for very small adults, the passenger sensing system
may or may not turn off the right front passenger frontal
airbag, depending upon the person's seating posture
and body build. Everyone in the vehicle who has
outgrown child restraints should wear a safety belt
properly — whether or not there is an airbag for that
person.
CAUTION:
{
If the airbag readiness light ever comes on and
stays on, it means that something may be wrong
with the airbag system. To help avoid injury to
yourself or others, have the vehicle serviced right
away. See Airbag Readiness Light on page 3-30
for more information, including important safety
information.