Audio And Visual System Noise Occurs

INSPECTION PROCEDURE

CHECK SPEAKER

CHECK NOISE CONDITIONS

INSPECTION PROCEDURE

1. Check the speaker unit installation condition and check that there are no cracks, scratches, deformation, or other failures.
   

   1. If the speaker is installed incorrectly, proceed to A.
      

   2. If foreign objects are in the speaker, proceed to B.
      

   3. If the speaker cone paper is broken, proceed to C.
      

1. Check the noise condition.
   

   HINT:

   The radio has a noise prevention function to reduce noise when listening to the radio. If a loud noise occurs, check whether the ground at the antenna mounting base and the noise prevention unit are installed and wired correctly.

   
   

   Noise Conditions	Noise Source
   Depressing accelerator pedal increases noise, and stopping engine stops noise immediately	Generator
   When A/C or heater is operating	Blower motor
   When rapidly accelerating on unpaved road, or when engine switch is on (IG)	Fuel pump
   When horn switch is pressed and released, or when horn switch is pressed and held down	Horn
   Running the engine causes soft noise, and stopping engine stops noise immediately	Engine switch on (IG)
   Noise occurs synchronously with turn signal flash	Flasher
   When window washer is operating	Washer
   Running the engine causes noise, but stopping engine does not stop noise	Water temperature sensor
   When wiper is operating	Wiper
   When brake pedal is depressed	Stop light switch
   Other	Static electricity

HINT:

1. In the chart's left column, find the situation that matches the customer complaint. Then, in the right column, find the part that is causing the noise. Check the noise filter on the part.
   
2. To save time and avoid a misdiagnosis, first make sure that the noise is not originating from outside the vehicle.
   
3. Troubleshoot noise problems in order of loudness, starting with the loudest noise.
   
4. Setting the radio to a frequency where no signal is received may make recognition of the noise problem easier.