Interface Dial Buttons Do Not Work
Interface dial buttons do not workNOTE:
- Always check the connectors for poor connections or loose terminals.
- Before troubleshooting, get the navigation system anti-theft codes.
- After troubleshooting, enter the navigation system anti-theft codes.
1. Turn the ignition switch to ACC (I).
2. 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.
3. 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.
4. Turn the ignition switch ON (II).
5. 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 an open in the wire between the under-dash fuse/relay box and the interface dial.
6. Turn the ignition switch OFF.
7. Disconnect the interface dial 5P connector.
8. Check for continuity between interface dial 5P connector terminal No. 3 and body ground.
Is there continuity?
YES - Go to step 9.
NO - Repair an open in the wire between the interface dial and body ground (G506).
9. 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.
10. Substitute a known-good interface dial, and recheck.
Is the system OK?
YES - Replace the original interface dial.
NO - Replace the navigation unit.