INSPECTION PROCEDURE
CHECK SPEAKER INSTALLATION
IDENTIFY NOISE SOURCE
AUDIO AND VISUAL SYSTEM (w/o Stereo Component Amplifier) - Noise Occurs
INSPECTION PROCEDURE
| 1.CHECK SPEAKER INSTALLATION |
Check that each speaker is securely installed.
- OK:
- Each speaker is securely installed.
Check the noise condition.
- 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 in Which Noise Occurs | Noise Type |
| Depressing accelerator pedal increases noise, and stopping engine stops noise immediately | Generator noise |
| When A/C or heater is operating | Blower motor noise |
When rapidly accelerating 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 |
| Running engine causes soft noise, and stopping engine stops noise immediately | Ignition noise |
| Noise occurs synchronously with turn signal flash | Flasher noise |
| Noise occurs during window washer operation | Washer noise |
| Running engine causes noise, but stopping engine does not stop noise | Engine coolant temperature sensor noise |
| When wiper is operating | Wiper noise |
| When brake pedal is depressed | Stop light switch noise |
| Other | Static electricity on vehicle |
In the left column of the chart, find the situation that matches the vehicle of the customer. Then, in the right column, find 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.
- OK:
- The noise source can be determined.
| | REPLACE RADIO RECEIVER ASSEMBLY ()
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| OK | |
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| REPAIR OR REPLACE NOISE SOURCE |
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