1. 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).■

1. Reconnect the navigation unit connector C (8P).

1. 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 .

1. 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 .

1. Turn the ignition switch ON (II).