Navigation System Symptom Troubleshooting - Interface dial buttons do not work
Interface dial buttons do not work
NOTE: Always check the connectors for poor connections or loose terminals.
  1. Turn the ignition switch to ACC (I).
  1. Go into the Diagnostic mode, and use ‘‘Hard Key'' test under Unit Check.
Do the buttons work properly?
YES -
The system is OK at this time.■
NO -
Go to Step 3 .
  1. Try all the buttons on the navigation system.
Is there a specific row or columns of buttons, set of buttons, or a certain button that does not respond properly (i.e. pressing a button in the lower left corner causes a button in the right lower corner to respond.)?
YES -
Replace the interface dial. ■
NO -
Go to Step 4 .
  1. Turn the ignition switch ON (II).
  1. Measure the voltage between the interface dial 5P connector terminal No. 4 and body ground.
Is there battery voltage?
YES -
Go to Step 6 .
NO -
Repair open in the wire between the under-dash fuse/relay box and the interface dial.■
  1. Turn the ignition switch OFF.
  1. Disconnect the interface dial 5P connector.