Mazda CX-7 2007 Workshop Manual page 1442

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
NO.5 BROKEN SOUND OR POOR SOUND QUALITY[ENTIRE AUDIO SYSTEM]
5 Broken sound or poor sound quality/Possible DTC: 09:Er21
Troubleshooting hints
• Speaker malfunction (e.g., any foreign material, broken)
• Improper speaker installation
• Audio unit malfunction
• Vibration of door trim and/or package trim
Diagnostic procedure
STEP
• Is there broken sound or poor sound quality
1
from all speakers?
• Inspect the sound while adjusting the sound
2
volume.
• Is there broken sound or poor sound quality
between "15" and "20"?
• Inspect the BASS/TREB.
3
• Is there poor sound quality at "-3 — +3" of
"BASS/TREB"?
Note
• When press the AUDIO CONT button for
a few seconds, BASS/TREB is set at "0".
• Attempt to duplicate the symptom on the
4
other vehicle.
• Is the sound better than the customer's
vehicle?
• Identify the speaker with broken sound by
5
adjusting BAL/FADE.
• Is the suspect speaker installed upward?
• Inspect the speaker installation condition.
6
• Is the speaker installed properly?
• Remove the speaker.
7
• Is there any foreign material or damage on
the speaker?
• Inspect the sound again.
8
• Is there broken sound?
09-03D–14
INSPECTION
Yes Go to the next step.
No Go to the Step 5.
Yes Go to the next step.
No The system is normal.
Yes Go to the next step.
No If there is broken sound at "+6— -6" of BASS/TREB with the
maximum volume, the system is normal.
Yes Without Bose:
Replace the audio unit.
(See 09-20-4 AUDIO UNIT REMOVAL/INSTALLATION.)
(See 09-20-5 AUDIO UNIT DISASSEMBLY/
ASSEMBLY.)
With Bose:
• If noise occurs from the speaker of a specific channel, or
the volume is minimized and the noise occurs:
— Replace the audio amplifier.
(See 09-20-6 AUDIO AMPLIFIER REMOVAL/
INSTALLATION.)
• If noise occurs from the speaker of two or more channels
or the volume is minimized and the noise does not
occurs:
— Replace the audio unit.
(See 09-20-4 AUDIO UNIT REMOVAL/
INSTALLATION.)
(See 09-20-5 AUDIO UNIT DISASSEMBLY/
ASSEMBLY.)
No The system is normal.
Yes Go to the Step 7.
No Go to the next step.
Yes Go to the next step.
No Install the speaker properly.
Yes Repair or replace the suspect speaker.
No Go to the next step.
Yes Go to the next step.
No Inspect the vibration from the door trim and/or package trim.
Repair or replace the suspect trim as necessary.
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