Toyota Corolla 2004 DIAGNOSTICS – AUDIO SYSTEM

05–637

–DIAGNOSTICS AUDIO SYSTEM (April, 2003)

0560L–02

NOISE OCCURS

INSPECTION PROCEDURE

1 CHECK OF SPEAKER INSTALLATION

(a) Check speaker installation condition.

(1) Check that each speaker is securely installed.

Standard: malfunction disappear.

HINT:
The radio is equipped with noise prevention system that does not work against the regular use of the radio,
thereby excessively large noise cannot occur in the radio. If large noise occurs, check whether or not the
earth on the antenna installation part and the proper noise–prevention equipment are all installed, and
whether or not the improper wiring is held.

Condition in which noise occurs Noise type

Depressing the acceleration pedal increases noise, and stopping the engine
erases the noise immediately.

Noise occurs during the A/C or the heater operation. Blower motor noise
Rapid acceleration during the drive on the unpaved road or after the IG

switch is turned ON makes noise.
Pressing and then releasing the horn switch, and keeping pressing the horn

switch makes noise.
Stopping the engine erases the small noise that has been heard. Ignition noise
Noise occurs in turn with the blink of the turn signal flash. Flasher noise
Noise occurs during the window washer operation. Washer noise
Noise occurs during the engine running, and it continues to occur after the

engine is stopped.
Noise occurs during the wiper operation. Wiper noise
Noise occurs when the brake pedal is depressed. Stop light switch noise
Others. Static electricity on the vehicle

HINT:

 Identify the condition under which the noise occurs, and check the noise filter on the related part.
 Make sure first that there is no noise from outside. Failing to do so makes the noise occurrence source

detection impossible and leads to misunderstanding.

 The noise should be removed in descending order of loudness.

Alternator noise

Fuel pump noise

Horn noise

Water temperature sensor noise

OK

IDENTIFICATION OF NOISE SOURCE

2004 COROLLA (RM1037U)

NG INSTALL IT PROPERLY

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