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AV-444 < SYMPTOM DIAGNOSIS > [BOSE AUDIO WITH NAVIGATION] NORMAL OPERATING CONDITION NORMAL OPERATING CONDITION Description INFOID:0000000003939280 AUDIO SYSTEM The majority of the audio troubles are the result of outside causes (bad CD, electromagnetic interference, Noise The following noise results from variations in field strength, such as fading noise and multi-path noise, or tains or buildings blocking the signal. • Multi-path noise: This noise results from the waves sent directly from the broadcast station arriving at the antenna at a different time from the waves which reflect off mountains or buildings. The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning. Type of Noise and Possible Cause NAVIGATION SYSTEM Basic Operation Vehicle Mark Occurrence condition Possible cause Occurs only when engine is ON. A continuous growling noise occurs. The speed of • Ignition components The occurrence of the noise is linked with the operation of the fuel pump. • Fuel pump condenser Noise only occurs when various A cracking or snapping sound occurs with the op- • Relay malfunction, audio unit malfunction The noise occurs when various motors are operat- • Motor case ground The noise occurs constantly, not just under certain conditions. • Rear defogger coil malfunction A cracking or snapping sound occurs while the vehicle is being driven, especially when • Ground wire of body parts Symptom Cause Remedy No image is shown. Display brightness adjustment is set fully to DARK Adjust the display brightness. No guide sound is heard. Volume control is set to OFF, MIN or MAX. Adjust the audio guide volume. Audio guidance is not available while the vehicle is System is not malfunctioning. Screen is too dark. Temperature inside the vehicle is low. Wait until the temperature inside the vehicle Small black or bright spots appear Symptom peculiar to a liquid crystal display (dis- System is not malfunction. 2009 Pathfinder |