Pioneer AVIC-505 Owner's Manual page 144

The Navigation commander fails to work.
Possible causes:
Solutions:
• Change the batteries.
• Check that the batteries are properly inserted according to the + and — markings.
• Ensure that the Navigation commander has a clear line of sight to the display unit.
• Move the Navigation commander closer to the receiver on the display unit.
Errors have increased.
Probable cause:
Solution:
• Reset the gyrosensor to begin learning again (see "Calibrating the built-in gyrosensor" on
page 27).