Mazda CX-7 2007 Workshop Manual page 1438

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
NO.4 NO SOUND FROM CERTAIN SPEAKER[ENTIRE AUDIO SYSTEM]
Vehicles Without Bose
4 No sound from certain speaker/Possible DTC: —
Troubleshooting hints
• Speaker malfunction (e.g., any foreign material, broken)
• Audio unit malfunction
• Short circuit inside speaker
• Open or short circuit in wiring harness between audio unit and speaker
Diagnostic procedure
STEP
• Turn the audio unit to ON.
1
• Press both POWER and AUTO-M buttons
more than 0.2 seconds at the same time.
Note
• The sounded speaker now changes in
the order of left — front speaker, right
— front speaker, right — rear
speaker and left — rear speaker.
• Is there any speaker with no sound?
• Turn the ignition switch to the LOCK position.
2
• Disconnect the audio unit connector (24-pin).
• Inspect the continuity between the audio unit
wiring harness-side connector (24-pin)
terminal and ground.
• Is there continuity?
• Remove the suspect speaker.
3
• Disconnect the speaker connector (2-pin)
and inspect the resistance of speaker.
• Is the resistance normal?
Specification
Speaker resistance + wiring harness
resistance
• Inspect the wiring harness between the
4
audio unit and the suspect speaker.
• Is there continuity?
• Inspect the suspect speaker.
5
• Is the speaker normal?
Note
• If the speaker lead wire contacts to either
ground or vehicle frame, replace the
speaker.
09-03D–10
INSPECTION
Yes If no sound from some speaker:
• Go to the next step.
If no sound at all:
• Go to the troubleshooting of "No.3 No sound from all
speakers".
No The troubleshooting is completed.
Yes Repair or replace the suspect wiring harness or speaker
unit.
Note
• If there is a short circuit between the speaker harness
or speaker lead wire and ground, the protector circuit
inside the audio unit operates to cut the sound.
No Go to the next step.
Yes Replace the audio unit.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the suspect wiring harness.
Yes Replace the audio unit.
No Go to the next step.
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