Other information:
The system becomes ready to start searching for lane markings when all the
following conditions are met:
The vehicle is traveling between about 45 and 90 mph (72 and 145 km/h).
The vehicle is on a straight or slightly curved road.
The turn signals are off...
Testing of Readiness Codes
Your vehicle has readiness code as part of the onboard self diagnostic
system.
Some States use these codes for testing to verify whether your vehicle's
emissions
components are working properly.
The codes may not be read properly if testing is performed just after the
battery has
gone dead or been disconnected...