PROCEDURE
(a) Check from which direction the noise comes (front left or right, or rear left or right).
OK: The location of the noise source can be determined.
| NG |
 | GO TO STEP 3 |
|
OK |
 | |
(a)
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 |
Condition | 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 |
| B |
| REINSTALL SPEAKER |
| C |
| REMOVE FOREIGN OBJECT |
| D |
| REPLACE SPEAKER |
|
A | |
| |
| 3. |
CHECK NOISE CONDITIONS | (a) Check the noise condition.
HINT: 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 vehicle accelerates rapidly on an unpaved road or after the ignition switch is turned ON. |
Fuel pump | | Noise occurs when the horn switch is pressed and released or when pressed and held. |
Horn | | Noise occurs synchronously with the blink of the turn signal. |
Flasher | | Noise occurs during window washer operation. |
Washer | | Noise occurs while the engine is running, and continues even after the engine is stopped. |
Engine coolant temperature sensor | |
Noise occurs during wiper operation. |
Wiper | | Noise occurs when the brake pedal is depressed. |
Stop light switch | | Other |
Static electricity |
HINT:
- 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.
OK: The noise source cannot be determined.
| OK |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG |
| REPAIR OR REPLACE NOISE SOURCE | |
