Inspection Procedure

1. Check the speaker unit installation condition and 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.

A: REINSTALL SPEAKER PROPERLY 

B: REMOVE FOREIGN OBJECT 

C: REPLACE SPEAKER 

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 OCCURS CONDITION CHART
   
   

   Conditions under which noise occurs	Noise Source
   Noise increases when the accelerator pedal is depressed, but stops when the engine is stopped.	Generator
   Noise occurs during A/C or heater operation.	Blower motor
   Noise occurs when the vehicle accelerates rapidly on an unpaved road or after the ignition switch is turned on.	Fuel pump
   Noise occurs when the horn switch is pressed and released or when pressed and held.	Horn
   Quiet noise occurs while the engine is running, but stops when the engine is stopped.	Ignition
   Noise occurs synchronously with the blink of the turn signal.	Flasher
   Noise occurs during window washer operation.	Washer
   Noise occurs while the engine is running, and continues even after the engine is stopped.	Water temperature sensor
   Noise occurs during wiper operation.	Wiper
   Noise occurs when the brake pedal is depressed.	Stop light switch
   Others	Static electricity

   HINT:

   • In the chart's left column, find the situation that matches the customer's complaint. 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 coming from outside the vehicle.
   • Noise should be removed in descending order of loudness.
   • Setting the radio to a frequency where no signal is received may make recognition of the noise problem easier.

NG: REPAIR OR REPLACE NOISE SOURCE 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE