Audio And Visual System Noise Occurs

INSPECTION PROCEDURE

CHECK SPEAKER INSTALLATION

IDENTIFY NOISE SOURCE

INSPECTION PROCEDURE

1. Check that each speaker is securely installed.
   

   OK:

   Each speaker is securely installed.
   

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.

   
   

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

   HINT:

   1. In the chart's left column, find the situation that matches the customer's vehicle. 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 that receives no signal may make recognition of the noise problem easier.