Mazda CX-7 2007 Workshop Manual page 1435

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
Vehicles With Bose
3 No sound from all speakers/Possible DTC: 00:Er04, 03:Er07, 03:Er10, 09:Er20, 09:Er21
Troubleshooting hints
• Speaker malfunction (e.g., any foreign material, broken)
• Audio amplifier malfunction
• Open or short circuit in wiring harness between audio amplifier and speaker
• Open or short circuit in wiring harness between audio amplifier and audio unit
• Short circuit inside speaker
Diagnostic procedure
STEP
• Press AUDIO CONT button more than 2
1
seconds.
• Play CD or radio.
• Adjust the volume between "10" and "15".
• Is there sound?
• Measure the voltage at the audio amplifier
2
terminal A (8-pin, vehicle harness-side)
• Is the voltage B+?
• Is there any sound?
3
INSPECTION
Yes The system is normal.
No Go to the next step.
Yes Go to Step 4.
No Repair or replace wiring harness between the audio
amplifier and fuse.
(See 09-20-6 AUDIO AMPLIFIER REMOVAL/
INSTALLATION.)
Go to the next step.
Yes The system is normal.
No Go to the next step.
ACTION
09-03D–7
09-03D