| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Audio/Visual/Telematics | Section: Audio/Video | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000NL503SX |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: INSPECTION PROCEDURE (2008 Sequoia) | ||
|
Noise Occurs |
INSPECTION PROCEDURE
PROCEDURE
|
1. |
NOISE CONDITION |
(a) Check which direction the noise comes from (front left or right, or rear left or right).
OK:
The location of the noise source can be determined.
|
|
2. |
CHECK SPEAKERS |
(a) Check the installation conditions of the speaker units that are located near the noise source and that there are no cracks, scratches, deformation, or other problems.
Result
|
Condition |
Proceed to |
|---|---|
|
A speaker is installed incorrectly |
A |
|
Foreign objects are in the speaker |
B |
|
A speaker cone paper is broken |
C |
|
No malfunction is found |
D |
|
|
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 chart's left column, find the situation that matches the customer's complaint. 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 coming from outside the vehicle.
- Noise should be removed 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.
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