Toyota Corolla (E120): Noise occurs
Inspection procedure
1 Check of speaker installation
- Check speaker installation condition.
- Check that each speaker is securely installed.
Standard: malfunction disappear.
Hint
: the radio is equipped with noise prevention system that does not work against the regular use of the radio, thereby excessively large noise cannot occur in the radio. If large noise occurs, check whether or not the earth on the antenna installation part and the proper noise–prevention equipment are all installed, and whether or not the improper wiring is held.
Hint
:
- identify the condition under which the noise occurs, and check the noise filter on the related part.
- Make sure first that there is no noise from outside. Failing to do so makes the noise occurrence source detection impossible and leads to misunderstanding.
- The noise should be removed in descending order of loudness.
Identification of noise source
Other materials:
Moon roof
Use the overhead switches to open and close the moon roof and tilt it up and
down.
■ Opening and closing
1 Opens the moon roof* The moon roof stops slightly before the fully open position
to reduce wind noise.
Press the switch again to fully open the moon roof.
2 Closes the moon roof*
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Uniform Tire Quality Grading
This information has been prepared in accordance with regulations issued by the
National Highway Traffic Safety Administration of the U.S. Department of Transportation.
It provides the purchasers and/or prospective purchasers of Toyota vehicles with
information on uniform tire quality grading.
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Customer problem analysis
Hint:
in troubleshooting, the problem symptoms must be confirmed
accurately, meaning that all preconceptions
must be set aside in order to make an accurate judgement. To ascertain what
the problem symptoms
are, it is extremely important to ask the customer about the problem and
cond ...