Display Unit Buttons Do Not Work
Display unit 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. Try several navigation buttons and touch screen buttons.
Do all buttons function properly?
YES - The system is OK at this time.
N0 -
- If all navigation buttons and touch screen are inoperative, go to step 3.
- If some navigation buttons operate normally, while others do not, go into the Diagnostic mode and use "Touch Panel" diagnostic under Monitor Check and if necessary, "Display" diagnostic under Unit Check.
3. Measure the voltage between body ground and display unit 20P connector terminal No.1 and No.2 individually.
Is there battery voltage?
YES - Go to step 4.
NO - If the +B wire does not have voltage, repair the open in the wire between the under-dash fuse/relay box and the display unit. If the ACC wire does not have voltage, repair the open in the wire between the under-dash fuse/relay box and the display unit.
4. Turn the ignition switch OFF.
5. Disconnect the display unit 20P connector.
6. Disconnect the navigation unit connector A (20P).
7. Check for continuity between display unit 20P connector terminal No.10 and body ground.
Is there continuity?
YES - Go to step 7.
NO - Repair the open in the wire between the display unit and body ground (G503).
8. Check for continuity between body ground and display unit 20P connector terminal No.3, No.5, No.13 and No.15 individually.
Is there continuity?
YES - There is a short to body ground in the circuit between the display unit and the navigation unit. Replace the affected shielded harness.
NO - Go to step 9.
9. Check for continuity between display unit 20P connector terminal No.4 and terminals No.3 and No.13 individually.
Is there continuity?
YES - There is a short between the display unit and the audio unit. Replace the shielded harness.
NO - Go to step 10.
10. Check for continuity between display unit 20P connector terminal No.14 and terminals No.5 and No.15 individually.
Is there continuity?
YES - There is a short between the display unit and the navigation unit. Replace the affected shielded harness.
NO - Go to step 11.
11. Check for continuity between display unit POP connector terminal No.5 and navigation unit connector A (20P) terminal No.10.
Is there continuity?
YES - Go to step 12.
NO - There is an open in the circuit between the display unit and the navigation unit. Check for poor connections or loose terminals at the display unit and navigation unit. If a poor connection or loose terminal is found, replace the affected shielded harness.
12. Check for continuity between display unit20P connector terminal No.15 and navigation unit connector A (20P) terminal No.20.
Is there continuity?
YES - Go to step 13.
NO - There Is an open in the circuit between the display unit and the navigation unit. Check for poor connections or loose terminals at the display unit and navigation unit. If a poor connection or loose terminal is found, replace the affected shielded harness.
13. Check for continuity between display unit 20P connector terminal No.3 and audio unit connector B (14P) terminal No.9.
Is there continuity?
YES - Go to step 14.
NO - There is an open in the circuit between the display unit and the audio unit. Check for poor connections or loose terminals at the display unit and audio unit. If a poor connection or loose terminal is found, replace the affected shielded harness.
14. Check for continuity between display unit 20P connector terminal No.13 and audio unit connector B (14P) terminal No.10.
Is there continuity?
YES - Replace the display unit.
NO - There is an open in the circuit between the display unit and the audio unit. Check for poor connections or loose terminals at the display unit and audio unit. If a poor connection or loose terminal is found, replace the affected shielded harness.