Mazda CX-7 2007 Workshop Manual page 1437

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
STEP
• Turn the ignition switch to LOCK position.
5
• Disconnect the audio amplifier connector
(40-pin).
• Inspect the continuity between the audio
amplifier connector and ground:
For front speaker
— Terminal 2A (40-pin, FRONT IP L SP-)—
GND
— Terminal 2B (40-pin, FRONT IP L SP+)—
GND
— Terminal 2F (40-pin, FRONT IP R SP-)—
GND
— Terminal 2D (40-pin, FRONT IP R SP+)—
GND
For front door speaker
— Terminal 2N (40-pin, FRONT DOOR L
SP-)— GND
— Terminal 2I (40-pin, FRONT DOOR L
SP+)— GND
— Terminal 2M (40-pin, FRONT DOOR R
SP-)— GND
— Terminal 2R (40-pin, FRONT DOOR R
SP-)— GND
For rear door speaker
— Terminal 2G (40-pin, REAR DOOR L SP-
)— GND
— Terminal 2I (40-pin, REAR DOOR L
SP+)— GND
— Terminal 2E (40-pin, REAR DOOR R SP-
)— GND
— Terminal 2C (40-pin, REAR DOOR R
SP+)— GND
For rear speaker
— Terminal 2J (40-pin, D-PILLAR L SP-)—
GND
— Terminal 2H (40-pin, D-PILLAR L SP+)—
GND
— Terminal 1F (40-pin, D-PILLAR R SP-)—
GND
— Terminal 1H (40-pin, D-PILLAR R SP+)—
GND
For center speaker
— Terminal 1E (40-pin, DASH CENTER -)—
GND
— Terminal 1G (40-pin, DASH CENTER +)—
GND
• Is there continuity?
• Turn the ignition switch to LOCK position.
6
• Disconnect the audio amplifier connector
(40-pin) and audio unit connector (24-pin).
• Inspect the continuity between the audio
amplifier terminal 3N (40-pin, vehicle
harness-side) and audio unit terminal J (24-
pin, vehicle harness- side).
• Is there continuity?
• Is there any sound?
7
End Of Sie
INSPECTION
Yes Repair or replace the related 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 amplifier.
No Repair or replace the wiring harness between the audio
amplifier and audio unit.
Then go to the next step.
Yes The system is normal
No Replace the audio amplifier.
ACTION
09-03D–9
09-03D