Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

NOISE CONDITION
1. Check from which direction the noise comes (front left or right, rear left or right).
  1. Check from which direction the noise comes.
    OK: The location of the noise source can be determined.
NG: Go to step 3

OK: Go to next step

CHECK SPEAKERS

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 malfunctions.

Result

RESULT REFERENCE

Result	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

CHECK NOISE CONDITIONS

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 CONDITIONS CHART

Condition 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 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 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 cannot be determined.

NG: REPAIR OR REPLACE NOISE SOURCE

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