Unit Check (Quick Check): Display
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This diagnosis does additional checks on the ECU bus between the audio-navigation unit and the navigation display unit. This test also checks the internal electronic functions.
- When the connection shows NG, first check for loose terminals at the audio-navigation unit and the navigation display unit connections. Next check for an open or short in the communication line between the audio-navigation unit and the navigation display unit. If the line has an open or a short, replace the affected shielded harness.
- If the Connection shows NG, the GA-Net bus line may be failure. Check for hard error codes (see How to Check Error History (Navigation DTCs) ).