Inspection Procedure

NOISE CONDITION

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

The location of the noise source can be determined.

Go to step 3

CHECK SPEAKERS

Result

(a) 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

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

REINSTALL SPEAKER

REMOVE FOREIGN OBJECT

REPLACE SPEAKER

CHECK NOISE CONDITIONS

(a) 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.

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 (IG or ACC).

Fuel pump

Conditions under which noise occurs

Noise source

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.

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 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.

The noise source cannot be determined. JNG>

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE NOISE SOURCE

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