Inspection Procedure


(a) Check that each speaker is securely installed. OK:

Speakers are installed securely.


The radio has a noise prevention function to reduce noise when listening to the radio. If severe noise occurs, check whether the ground at the antenna mounting base and the noise prevention unit are installed and wired correctly.

Condition in Which Noise Occurs

Noise Type

Increases when accelerator pedal is depressed, and stops immediately when engine is stopped

Generator noise

When A/C or heater is operating

Blower motor noise

• When vehicle is rapidly accelerated on unpaved road

• When ignition switch is ON

Fuel pump noise

• When horn switch is pressed and released

• When horn switch is pressed and held down

Horn noise

Occurs faintly when engine is running, and stops immediately when engine is stopped

Ignition noise

When turn signal is operating

Flasher noise

When window washer is operating

Washer noise

When engine is running, and continues even when engine is stopped

Engine coolant temperature noise

When wipers are operating

Wiper noise

When brake pedal is depressed

Stop light switch noise

Other than above

Static electricity on vehicle


• Use the table above to identify the part that is causing the noise. Check the noise filter on the part.

• To save time and avoid a misdiagnosis, first make sure that the noise is not originating from outside the vehicle.

• Troubleshoot noise problems in order of loudness, starting with the loudest noise.

• Setting the radio to a frequency that receives no signal may make recognition of the noise problem easier.



Pressing Power Switch does not Turn on System

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