No Picture Is Shown on the Display
Symptom TroubleshootingNo picture is shown on the display
NOTE: Always check the connectors for poor connections or loose terminals
1. Check the INTR LIGHT (10 A) fuse in the passenger's under-dash fuse relay box, and reinstall the fuse if it is OK.
Is the fuse OK?
YES - Go to step 2.
NO - Replace the fuse and recheck.
2. Turn the ignition switch to ACC (I).
3. Operate the radio and listen to the audio.
Can audio be heard?
YES - Go to step 4.
NO - Check the ACC circuit.
4. Turn the ignition switch ON (II).
5. Measure the voltage between body ground and navigation unit connector C (8P) terminals No. 1 and No. 2 individually.
Is there battery voltage?
YES - Go to step 6.
NO - If the +B wire does not have voltage, repair open in the wire between the passenger's under-dash fuse relay box and the navigation unit. If the ACC wire does not have voltage, repair open in the wire between the driver's under-dash fuse relay box and the navigation unit.
6. Turn the ignition switch OFF.
7. Disconnect the navigation unit connector C (8P).
8. Check for continuity between navigation unit connector C (8P) terminal No. 4 and body ground.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire between the navigation unit and body ground (G501).
9. Reconnect the navigation unit connector C (8P).
10. Perform the forced starting of the display.
Is the diagnosis menu of the picture diagnosis displayed?
YES - Perform the system links test in the system diagnosis test menu. If a problem is detect when you do this test, check the Disp Bus (+) and Disp Bus (-) circuits.
NO - Go to step 11.
11. Shield the display unit from the sun with your hand, and check that the display is back lit (only back light is ON ).
Can you see the back light?
YES - Replace the navigation unit with a known good unit.
- If the symptom is gone, replace the original unit.
- If the display does not show any back light, substitute a known good display unit, and recheck. If the symptom is gone, replace the original display unit.
NO - Replace the display unit.