Check from which direction the noise comes (front left or right, or rear left or right).
The location of the noise source can be determined.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Check the installation condition of the speaker units that are located near the noise source and that there are no cracks, scratches, deformation or other failures.
| Result | Proceed to |
|---|---|
| No malfunction is found. | A |
| A speaker is installed incorrectly. | B |
| Foreign matter is in a speaker. | C |
| A speaker cone paper is broken. | D |
A
B
C
D
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 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 horn switch is pressed and released or when pressed and held. | Horn |
| Noise occurs synchronously with the turn signal blinking pattern. | Flasher |
| Noise occurs during window washer operation. | Washer |
| Noise occurs during wiper operation. | Wiper |
| Noise occurs when the brake pedal is depressed. | Stop light switch |
| Others | Static electricity |
In the left column of the table, find the situation that matches the customer's complaint. Then, in the right column, find the part that is causing the noise. Check the respective noise filter.
To save time and avoid a misdiagnosis, first make sure that the noise is not coming from outside the vehicle.
Troubleshoot noises in descending order of loudness.
Setting the radio to a frequency where no signal is received may make recognition of the noise problem easier.
| Result | Proceed to |
|---|---|
| The noise source cannot be determined. | A |
| The noise source can be determined. | B |
A
B