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2008 - MX-5 - Body and Accessories

CONFIRMATION STEP 1: RECEPTION CONDITION SYMPTOM (EXAMPLE) [AUDIO]



Symptom

Antenna signal condition

Source

Only a buzzing sound from the speakers

  • There is no radio station broadcasting.

  • Signals from the antenna to the audio unit are not transmitted.

  • Electric noise caused by the operation of internal circuit from the audio unit itself

  • Atmospheric noise

A buzzing or crunching sound and normal sound produced at the same time from the speakers

  • Though signals are transmitted from the antenna to the audio unit, electrical noise from other sources is greater.

  • Electrical noise caused by the operation of electrical components on the vehicle

  • Electrical noise from high tension wires, transformer substation (factory), electrical feeder line (street car), or motorcycle.

A thumping sound and normal sound produced at the same time from the speakers (FM only)

  • Noise occurs due to radio wave environment at specific places (e.g. in valleys between buildings). Noise varies when the vehicle itself or surrounding vehicles move. (FM only)

  • Interference between direct and reflected waves of FM signals causes noise (Multipass noise).




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