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).
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 -
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.
  1. Check for continuity between interface dial 5P connector terminal No. 3 and body ground.
Is there continuity?
YES -
Go to Step 9 .
NO -
Repair open in the wire between the interface dial and body ground (G503).■
  1. Check for continuity between navigation unit connector A (20P) terminal No. 17 and interface dial 5P connector terminal No. 1.
Is there continuity?
YES -
Check for an open in the wire between the navigation unit connector A (20P) terminal No. 19 and the interface dial 5P connector terminal No. 2. If the wire is OK, go to Step 10 . If the wire is open, repair the wire.■
NO -
There is an open in the circuit between the interface dial and the navigation unit. Check for poor connections or loose terminals at the interface dial and navigation unit. If a poor connection or loose terminals is found, replace the affected shielded harness.■
Is the system OK?
YES -
NO -