Mazda CX-7 2007 Workshop Manual page 1434

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
STEP
• Connect the audio unit connector.
3
• Inspect the voltage for the power supply line
(B+, ACC).
Specification:
Ignition switch ON: 11.5 V or more
Idle: 12.5 V or more
• Is the voltage normal?
• Turn the ignition switch to the LOCK position.
4
• Remove the audio unit connector (24-pin).
• Inspect the continuity between the audio unit
wiring harness-side connector terminal W
and the ground.
• Is there the continuity?
End Of Sie
NO.3 NO SOUND FROM ALL SPEAKERS[ENTIRE AUDIO SYSTEM]
Vehicles Without Bose
3 No sound from all speakers/Possible DTC: 00:Er04, 00:Er10, 03:Er07, 03:Er10, 09:Er20, 09:Er21
Troubleshooting hints
• Speaker malfunction (e.g., any foreign material, broken)
• Audio unit malfunction
• Short circuit in wiring harness between audio unit and speaker
• Short circuit inside speaker
Diagnostic procedure
STEP
• Press AUDIO CONT button more than 2
1
second.
• Play the CD or Radio.
• Adjust the volume between "10" to "15".
• Is there sound?
• Turn the ignition switch to the LOCK position.
2
• Remove the audio unit.
• Disconnect the audio connector (24-pin).
• Inspect the continuity between the audio unit
wiring harness-side connector terminal and
ground:
For front door speaker
— Terminal A (L+) — GND
— Terminal C (L-) — GND
— Terminal D (R+) — GND
— Terminal F (R-) — GND
For rear door speaker
— Terminal S (L+) — GND
— Terminal U (L-) — GND
— Terminal V (R+) — GND
— Terminal X (R-) — GND
— Is there continuity?
• Remove the speaker.
3
• Disconnect the speaker connector (2-pin).
• Inspect the continuity between the speaker
wiring harness-side connector (2-pin)
terminal and ground:
For each speaker
— Terminal A — GND
— Terminal B — GND
• Is there continuity?
09-03D–6
INSPECTION
INSPECTION
Yes Go to the next step.
No Repair or replace the suspect wiring harness.
Yes Replace the audio unit.
No Repair or replace the wiring harness.
Yes The system is normal.
No Go to the next step.
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 speaker.
No Replace the audio unit.
ACTION
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