Honda ACCORD HYBRID 2005 Service Manual page 2028

Audio System
S o u n d Q u a l i t y D i a g n o s i s ( c o n t ' 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 filtered by the audio system.
Make sure you remove cell phones and/or turn off any
aftermarket devices before beginning this test.
1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA
100) into the audio unit.
2. Play track No. 4 (digital zero) at a n o r m a l , or slightly
higher than normal, v o l u m e level.
3. Operate any electrical device that may causes
noise f r o m the audio system, including starting the
engine.
4. Play track No. 5 (near digital zero) at a n o r m a l , or
slightly higher than n o r m a l , v o l u m e level.
5. Operate any electrical device that may causes
noise f r o m the audio system, including starting the
engine.
6. Play track No. 6 (SNR) at a n o r m a l , or slightly
higher than normal, v o l u m e level.
7. Operate any electrical device that causes noise
f r o m the audio system, including starting the
engine.
• If no abnormal noise is heard, go to the
individual speaker test (see page 23-63).
• 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 g r o u n d at the audio unit, engine, or
battery cable
- Pinched or shorted speaker w i r e
- Faulty audio unit
- Other faulty c o m p o n e n t s causing excessive
electrical noise (ignition coils, alternator, door
lock actuators, etc.). Disconnect any suspect
components, and then replay the tracks that
w e r e originally noisy. If the noise is gone,
check the component's circuit and the
component.
23-62