Cadillac 2006 XLR Owner's Manual page 170

Emissions Inspection and
Maintenance Programs
Some state/provincial and local governments have or
may begin programs to inspect the emission control
equipment on your vehicle. Failure to pass this
inspection could prevent you from getting a vehicle
registration.
Here are some things you need to know to help your
vehicle pass an inspection:
Your vehicle will not pass this inspection if the
Check Engine light is on or not working properly.
To perform a Check Engine light bulb check with the
keyless ignition, make sure the transmitter fob is in the
passenger compartment. See Ignition Positions on
page 2-21. Press the bottom of the ACC button on
the instrument panel and hold the button down
for five seconds. The instrument panel, including the
3-60
Check Engine light, will light up and the ignition will be
on, but the engine will not start — if you press the
bottom of the ACC button only briefly, less than
five seconds, the accessory mode will be turned on, but
not the ignition. After the bulb check, be sure to press
and release the ACC button again to turn the ignition off
and avoid draining the vehicle's battery.
Your vehicle will not pass this inspection if the OBD
(on-board diagnostic) system determines that critical
emission control systems have not been completely
diagnosed by the system. The vehicle would be
considered not ready for inspection. This can happen
if you have recently replaced your battery or if your
battery has run down. The diagnostic system is
designed to evaluate critical emission control systems
during normal driving. This may take several days
of routine driving. If you have done this and your vehicle
still does not pass the inspection for lack of OBD
system readiness, your GM dealer can prepare the
vehicle for inspection.