Mazda CX-7 2007 Workshop Manual page 1445

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
NO.9 AUDIO SYSTEM ILLUMINATION DOES NOT ILLUMINATE AT ALL[ENTIRE AUDIO SYSTEM]
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9 Audio system illumination does not illuminate at all/Possible DTC: 09:Er20, 21:Er19
Troubleshooting hints
• Poor connection of audio unit connector, terminal damage
• Audio unit malfunction
• Burnt fuse (TNS signal)
• Open or short circuit in TNS signal wiring harness
• Center panel malfunction
Diagnostic procedure
STEP
• Are all illumination on the audio unit turned
1
OFF?
• Turn the ignition switch to the LOCK position.
2
• Inspect the fuse (ILLUMI).
• Is the fuse normal?
• Turn the ignition switch to the LOCK position.
3
• Disconnect the audio unit connector (24-pin)
and inspect the continuity between the audio
unit wiring harness-side connector terminal
E (TNS) and the ground.
• Is there continuity?
• Inspect the connection of the audio unit
4
connector (24-pin).
• Inspect both the audio unit and wiring
harness-side connector terminal E for poor
connection (such as damaged/pulled-out
pins, corrosion).
• Are all the pins normal?
• Connect the audio unit connector (24-pin).
5
• Turn the ignition switch to the ACC position.
• Inspect the voltage at the audio unit
connector terminal E (TNS).
• Is the voltage B+ when the light switch is
turned to the TNS position?
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NO.10 LCD DOES NOT DISPLAY AT ALL[ENTIRE AUDIO SYSTEM]
10 LCD does not display at all/Possible DTC: 09:Er20, 21:Er19
Troubleshooting hints
• Audio unit malfunction
• Information display malfunction
Diagnostic procedure
STEP
• Turn the audio unit to ON.
1
• Press both POWER ON/OFF and SEEK UP
buttons for 0.2 seconds at the same time.
• Does the LCD display properly?
• Press either CLC or SET/INFO button on the
2
information display.
• Does the beep sound?
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INSPECTION
INSPECTION
Yes Go to the next step.
No Replace the center panel.
Yes Go to the Step 4.
No Go to the next step.
Yes Repair or replace the short circuit in the suspect wiring
harness. After repair the harness, replace with the
appropriate standard fuse.
No Go to the next step.
Yes Go to the next step.
No If poor connection of audio unit connector:
• Securely connect the audio unit connector.
If the audio unit side connector is wrong:
• Replace the audio unit.
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
Yes Replace the audio unit.
No Repair or replace the suspect wiring harness (TNS signal).
Yes Go to the next step.
No Replace the information display.
Yes Replace the audio unit.
No Replace both audio unit and information display.
(CAN communication malfunction)
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ACTION
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ACTION
09-03D–17
09-03D