See also:

Checking the Battery
Check the battery condition monthly. Look at the test indicator window and check the terminals for corrosion. If your vehicle's battery is disconnected or goes dead:  - The audio system ...

Playing the AM/FM Radio (EX-L model with navigation system)
...

Emissions Testing
Testing of Readiness Codes Your vehicle uses “readiness codes,” as part of its onboard self diagnostic system. Some states refer to these codes during testing to see if your vehicle’s em ...