Mazda CX-7 2007 Workshop Manual page 1439

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
Vehicles With Bose
4 No sound from certain speaker/Possible DTC: —
Troubleshooting hints
• Speaker malfunction (e.g., foreign material, broken)
• Audio amplifier malfunction
• Short circuit inside speaker
• 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
• Poor connection of audio unit connector, terminal damage
• Poor connection of audio amplifier connector
Diagnostic procedure
STEP
• Turn the audio unit on.
1
• Press the POWER button and
simultaneously press down the AUTO-M
switch for 0.2 seconds.
Note
• This function outputs sound to each
speaker sequentially to allow
determination of which speaker is not
emitting sound.
• Is there any speaker with no sound?
• Does the same speaker have no sound if
2
changing the sound source? (Radio, CD)
• Turn the ignition switch to the LOCK position.
3
• Inspect the connection of the audio unit
connector (24-pin). (for sound signal line)
• Is the connector connected securely?
• Turn the ignition switch to the LOCK position.
4
• Remove the audio unit.
• Disconnect the audio unit connector (24-pin).
• Inspect the continuity between the audio unit
wiring harness-side connector and ground.
— Terminal A (LH+)— GND
— Terminal C (LH-)— GND
— Terminal D (RH+)— GND
— Terminal F (RH-)— GND
• Is there continuity?
• Inspect the continuity between the following
5
terminals of the audio amplifier wiring
harness-side connector (40-pin) and the
audio unit wiring harness-side connector (24-
pin).
For front speaker (audio unit— audio
amplifier)
— Terminal A (LH+)— Terminal 3L
— Terminal C (LH-)— Terminal 3J
— Terminal D (RH+)— Terminal K
— Terminal F (RH-)— Terminal I
• Is there continuity?
• Inspect the connection of the audio amplifier
6
connector (40-pin).
• Is the connector connected securely?
INSPECTION
Yes If no sound from some speaker:
• Go to the next step.
If not sound at all:
• Go to the troubleshooting of "No.3 No sound from all
speakers".
No The troubleshooting completed. (The system is normal.)
Yes Go to the next step.
No Replace the audio unit.
(See 09-20-4 AUDIO UNIT REMOVAL/INSTALLATION.)
(See 09-20-5 AUDIO UNIT DISASSEMBLY/ASSEMBLY.)
Note
• If the different speaker has no sound now, the audio
unit is malfunctioning.
Yes Go to the next step.
No Connect the audio unit connector (24-pin) securely.
Yes Go to the next step.
No Go to Step 6.
Yes Go to the next step.
No Repair or replace the related wiring harness between the
audio amplifier and the audio unit.
Then go to the next step.
Yes Go to the next step.
No Connect the audio amplifier (40-pin) securely.
ACTION
09-03D–11
09-03D