Audio And Visual System (For Radio Receiver Type) Noise Occurs


INSPECTION PROCEDURE

NOISE CONDITION

CHECK SPEAKERS

CHECK NOISE CONDITIONS

AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) - Noise Occurs


INSPECTION PROCEDURE

1.NOISE CONDITION

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

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


NG
Go to step 3
OK


2.CHECK SPEAKERS

  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 malfunctions.

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



B
REINSTALL SPEAKER

C
REMOVE FOREIGN OBJECT

D
REPLACE SPEAKER
A


3.CHECK NOISE CONDITIONS

  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.
    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 vehicle accelerates rapidly on an unpaved road or after the ignition switch is turned to ON.
    		Fuel pump
    Noise occurs during window defogger operation.
    		Back door glass (window defogger)
    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
    Other
    		Static electricity
    HINT:
    1. In the left column of the table, find the situation that matches the customer's complaint. Then, in the right column, find the part that is causing the noise. Check the respective noise filter.
    2. To save time and avoid a misdiagnosis, first make sure that the noise is not coming from outside the vehicle.
    3. Troubleshoot noises in descending order of loudness.
    4. 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 SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000012A80HUX.html)