Honda ACCORD HYBRID 2005 Service Manual page 2018

Audio System
A c t i v e N o i s e C o n t r o l S y s t e m T r o u b l e s h o o t i n g
Boomming sound while driving
1. Turn the ignition switch ON (II).
2. Operate the audio unit, and check the function of
the speakers.
Is sound heard from all of the speakers?
Y E S — G o t o step 3.
NO—Go to no sound is heard f r o m speakers
(see page 23-30). •
3. Turn the audio power switch OFF.
4. Perform the Self-diagnostic Procedure (see page
23-19).
5. Press the SCAN button (with navigation) or the
" N o . 1 " button (without navigation).
Is the low-frequency hum heard?
Y E S — G o t o step 6.
N O — G o t o step 26.
6. Check that the low-frequency h u m continues
sounding for about 1 minute.
Does the low-frequency hum sound continue
sounding for about 1 minute?
Y E S — G o t o step 45.
N O — G o t o step 7.
7. Check for the No. 32 (7.5 A) fuse in the under-dash
fuse/relay box.
Is the fuse OK ?
Y E S — G o t o step 8.
NO—Replace the fuse, and r e c h e c k . •
8. Turn the ignition switch OFF.
9. Disconnect the active noise control f r o n t
microphone 5P connector and the active noise
control rear microphone 4P connector f r o m active
noise control microphone harness.
10. Turn the ignition switch ON (II).
11. Check for voltage between the active noise control
front or rear microphone 4P or 5P harness
connector No. 4 (front) or No. 1 (rear) t e r m i n a l and
body g r o u n d .
ACTIVE NOISE C O N T R O L FRONT MICROPHONE
H A R N E S S 5P C O N N E C T O R
1 2
Y E L
T e r m i n a l side of male t e r m i n a l s
ACTIVE NOISE C O N T R O L REAR MICROPHONE
H A R N E S S 4P C O N N E C T O R
Wire side of f e m a l e t e r m i n a l s
Is there battery voltage?
Y E S - G o t o step 12.
NO—Repair an open in the w i r e between the No. 32
(7.5 A) in the under-dash fuse/relay box and the
active noise control front or rear m i c r o p h o n e 4P or
5P connector. •
23-52