Honda Accord 2008 Manual page 2549

07/11/02 09:51:50 61TA0000_230_0105
Audio System
Sound Quality Diagnosis (cont'd)
Special tools required
Diagnostics CD 07AAZ-SDBA100
Electrical Noise Test
Do this test to check for electrical noise being induced
into the audio system.
NOTE: Electrical noise may be caused by outside
sources that cannot be handled by the audio system.
Make sure you remove any cell phones and/or turn off
any aftermarket devices before beginning this test.
1. Insert the audio diagnostic CD (T/N 07AAZ-
SDBA100) into the audio unit.
2. Play track No. 4 (digital zero) at a normal, or slightly
higher than normal, volume level.
3. Operate any electrical device that may create
electrical noise in the audio system, including
starting the engine.
4. Play track No. 5 (near digital zero) at a normal, or
slightly higher than normal, volume level.
5. Operate any electrical device that may create
electrical noise in the audio system, including
starting the engine.
6. Play track No. 6 (SNR) at a normal, or slightly
higher than normal, volume level.
23-104
7. Operate any electrical device that may create
electrical noise in the audio system, including
starting the engine.
• If no abnormal noise is heard, go to the
individual speaker test (see page 23-105).
• If the noise is present only during the SNR track,
replace the audio unit.
• If the noise is heard during the digital zero or
near digital zero track, check for
– Poor ground at the audio unit, amplifier,
engine, or battery cable
– Pinched or shorted speaker or amplifier wire
– Faulty amplifier
– Faulty audio unit
– Other faulty components causing excessive
electrical noise (ignition coils, alternator, door
lock actuators, etc.). Disconnect any suspect
components, and then replay the tracks that
were originally noisy. If the noise is gone,
check the component's circuit and the
component.
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