Navigation System Symptom Troubleshooting - No picture is displayed

No picture is displayed NOTE Always check the connectors for poor connections or loose terminals. Diagnostic Test: Navi System Link Check the No. 7 (10 A) fuse and No. 32 (7.5 A) fuse in the 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.■
Turn the ignition switch to ACC (I). Operate the radio and listen to the audio. Can audio be heard?
YES | - | Go to Step 4 .
NO | - | Check the ACC circuit.■
Turn the ignition switch ON (II). 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 under-dash fuse/relay box and the navigation unit. If the ACC wire does not have voltage, repair open in the wire between the under-dash fuse/relay box and the navigation unit.■
Turn the ignition switch OFF. Disconnect the navigation unit connector C (8P). |

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 (G603).■
Reconnect the navigation unit connector C (8P). Perform the forced starting of the display. Is the diagnosis menu of the picture diagnosis displayed?
YES | - | Go into the Diagnostic mode and use the ‘‘Navi System Link'' diagnostic to check the links.■
NO | - | Go to Step 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 . ■
NO | - | Go to Step 12 .
Turn the ignition switch ON (II). |

Measure the voltage between body ground and display unit connector B (20P) terminal No. 1 and No. 2 individually. Is there battery voltage?
YES | - | Replace the display unit.■
NO | - | If the +B wire does not have voltage, repair open in the wire between the under-dash fuse/relay box and the navigation unit. If the ACC wire does not have voltage, repair open in the wire between the under-dash fuse/relay box and the navigation unit.■