Inspection Procedure

1. Check in which direction the noise comes from (front left or right, or rear left or right).
   1. Check in which direction the noise comes from.

      OK: The location of the noise source can be determined. 

NG: Go to step  3

OK: Go to Next Step 

1. Check the installation conditions of the speaker units that are located near the noise source and that there are no cracks, scratches, deformation, or other failures.

   Result 

   RESULT CHART
   
   

   Condition	Proceed to
   A speaker is installed incorrectly	A
   Foreign objects are in the speaker	B
   A speaker cone paper is broken	C
   No malfunction is found	D

A: REINSTALL SPEAKER 

B: REMOVE FOREIGN OBJECT 

C: REPLACE SPEAKER 

D: 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 PROBLEM 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 engine switch is turned on (IG).	Fuel pump
   Noise occurs when the horn switch is pressed and released or when pressed and held.	Horn
   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.	Engine coolant 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 or for 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.

   OK: The noise source can be determined. 

NG: REPAIR OR REPLACE NOISE SOURCE 

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