Inspection Procedure

1. Check that each speaker is securely installed

   OK: Each speaker is securely installed. 

NG: INSTALL SPEAKER PROPERLY 

OK: Go to next step 

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 CONDITION CHART
   
   

   Condition in Which Noise Occurs	Noise Type
   Depressing accelerator pedal increases noise, and stopping hybrid system stops noise immediately	Generator noise
   When A/C or heater is operating	Blower motor noise
   When rapidly accelerating on unpaved road When power switch is turned ON (IG)	Fuel pump noise
   When horn switch is pressed and released When horn switch is pressed and held down	Horn noise
   Running hybrid system causes soft noise, and stopping hybrid system stops noise immediately	Ignition noise
   Noise occurs synchronously with turn signal flash	Flasher noise
   Noise occurs during window washer operation	Washer noise
   Running hybrid system causes noise, but stopping hybrid system 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:

   • 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.
   • 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.

   OK: The noise source can be determined. 

NG: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL  )

OK: REPAIR NOISE SOURCE