Inspection Procedure

1. Check that each speaker is securely installed.

   OK: Speakers are installed securely. 

   HINT:

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

   NOISE OCCUR CONDITION AND NOISE TYPE
   
   

   Condition In Which Noise Occurs	Noise Type
   Increases when accelerator pedal is depressed, and stops immediately when engine is stopped	Generator noise
   When A/C or heater is operating	Blower motor noise
   When vehicle is rapidly accelerated on unpaved road When ignition switch is ON	Fuel pump noise
   When horn switch is pressed and released When horn switch is pressed and held down	Horn noise
   Occurs faintly when engine is running, and stops immediately when engine is stopped	Ignition noise
   When turn signal is operating	Flasher noise
   When window washer is operating	Washer noise
   When engine is running, and continues even when engine is stopped	Engine coolant temperature noise
   When wipers are operating	Wiper noise
   When brake pedal is depressed	Stop light switch noise
   Other than above	Static electricity on vehicle

   HINT:

   • Use the table above to identify the part that is causing the noise. Check the noise filter on the part.
   • To save time and avoid a misdiagnosis, first make sure that the noise is not originating from outside the vehicle.
   • Troubleshoot noise problems in order of loudness, starting with the loudest noise.
   • Setting the radio to a frequency that receives no signal may make recognition of the noise problem easier.

NG: INSTALL SPEAKER PROPERLY 

OK: IDENTIFY NOISE SOURCE