Mazda CX-9 Grand Touring. Manual - part 525

1



Is the lens of the back camera dirty or view is 
obstructed?  

Yes

Clean the lens of the back camera or 
remove the obstruction.

No

Go to the next step.

2



Does the lens of the back camera have a crack and 
damage?  

Yes Replace the back camera.

No

Go to the next step.

3



Turn the ignition switch to the LOCK position.  



Remove the back camera.  



Inspect the connection of the back camera 
connector (4-pin).  



Disconnect the back camera connector (4-pin).  



Inspect both the back camera and wiring harness-
side connector for poor connection (such as 
damaged/pulled-out pins, corrosion).  



Are all the pins normal?  

Yes Go to the next step.

No

If poor connection of back camera 

connector:  



Securely connect the back 

camera connector.  

 

If the back camera connector is 

wrong:  



Replace the back camera.  

 

If the wiring harness-side 

connector is wrong:  



Repair or replace the pins 

and/or the connector.  

4



Turn the ignition switch to the LOCK position.  



Remove the audio unit.  



Inspect the connection of the audio unit connector 
(4-pin).  



Disconnect the audio unit connector (4-pin).  



Inspect both the audio unit connector terminal for 
poor connection (such as damaged/pulled-out pins, 
corrosion).  



Are all the pins normal?  

Yes Go to the next step.

No

If poor connection of audio unit 

connector:  



Securely connect the audio 

unit connector.  

 

If the audio unit connector is 

wrong:  



Replace the audio unit.  

 

If the wiring harness-side 

connector is wrong:  



Repair or replace the pins 

and/or the connector.  



Inspect the following wiring harnesses between 
the audio unit and rear mount camera. 

Yes Go to the next step.

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Symptom Troubleshooting (Car Navigation System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:40:44 AM

Page 16 

© 2005 Mitchell Repair Information Company, LLC. 

NO.8 SPEECH RECOGNITION DOES NOT START [CAR-NAVIGATION 
SYSTEM] 

TROUBLESHOOTING CHART 

DIAGNOSTIC PROCEDURE 

DIAGNOSTIC PROCEDURE 

5



Terminal A (4-pin, POWER)-terminal A (4-
pin, POWER)  



Terminal B (4-pin, P-GND)-terminal B (4-
pin, P-GND)  



Terminal C (4-pin, V-GND)-terminal D (4-
pin, V-GND)  



Terminal D (4-pin, COMPOSITE)-terminal 
C (4-pin, COMPOSITE)  



Is there open or short circuit?  

No

Inspect the suspect wiring harness. 

Repair or replace if necessary.

6



Turn the ignition switch to the LOCK position.  



Remove the audio unit.  



Disconnect the audio unit connector (24-pin).  



Turn the ignition switch to ON.  



Shift the selector lever in R range.  



Inspect the voltage between the rear view monitor 
control module terminals M (24-pin, REV) and W 
(24-pin, GND).  



Is the voltage B+?  

Yes

Replace the back camera, then 
inspect generating of malfunction 
symptom. 
Even if it exchanges back camera, 
when a fault phenomenon occurs: 



Replace the audio unit.  



Reinspect the malfunction 
symptom, then repeat from 
Step 1 if malfunction recurs.  

No

Inspect the suspect wiring harness 

(reverse signal). Repair or replace if 

necessary.

8

Speech recognition does not start

POSSIBLE 

CAUSE 



Microphone malfunction  



Car-navigation unit malfunction  



Audio control switch malfunction  



Poor connection of audio unit connector, terminal damage  



Poor connection of car-navigation unit connector, terminal damage  



Open or short circuit in wiring harness between audio unit and car-navigation 
unit  

STEP

INSPECTION

ACTION



Turn the ignition switch to the ACC position.  

Yes Go to the next step.

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Symptom Troubleshooting (Car Navigation System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:40:44 AM

Page 17 

© 2005 Mitchell Repair Information Company, LLC. 

1



Start the car-navigation.  



Display the map screen.  



Press the VOICE button (audio control switch).  



Is the speech recognition icon displayed on the 
screen upper left?  

No

Go to Step 4.

2



Start the diagnostic function.  



Press the Menu button inside of diagnostic 
screen.  



Select "Navigation check".  



Select "Microphone check".  



After pressing the VOICE button, it utters 
somewhat greatly toward a microphone.  



Inspect the display of "Microphone input level 
judging".  



Is a judgment "OK" (blue display)?  

Yes

The system is normal. 

CAUTION:



Sound may not be recognized 
by the influence of the 
following. 



Speaker's utterance 
method  



Road noise  



Other noises  

No

Replace the microphone, then go to 

the next step.

3



Does the fault phenomenon improve?  

Yes Troubleshooting is completed.
No

Replace the car-navigation unit.

4



Start the diagnostic function.  



Inspect the display of "Microphone" in 
diagnostic screen.  



Is it display "OK"?  

Yes Go to the next step.

No

Go to Step 6.

5



The power supply of the audio unit is turned on. 



Press the VOICE button (audio control switch).  



Does it muffle?  

Yes Replace the car-navigation unit.

No

Audio control switch system 

malfunction. Go to the audio symptom 

troubleshooting.

6



Turn the ignition switch to the LOCK position.  



Remove the microphone.  



Inspect the connection of the microphone 
connector (6-pin).  



Is the connection securely connected?  

Yes Go to the next step.

No

Securely connect the microphone 

connector.

7



Disconnect the microphone connector (6-pin).  



Inspect both microphone connector and wiring 
harness-side connector for poor connection 
(such as damaged/pulled-out pins, corrosion).  



Are all the pins normal?  

Yes Go to the next step.

No

If the microphone connector is 

wrong:  



Replace the microphone.  

 

If the wiring harness-side connector 

is wrong:  

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Symptom Troubleshooting (Car Navigation System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:40:44 AM

Page 18 

© 2005 Mitchell Repair Information Company, LLC. 



Repair or replace the pins and/or 

the connector.  

8



Remove the car-navigation unit.  



Inspect the connection of the car-navigation unit 
connector (6-pin).  



Is the connection securely connected?  

Yes Go to the next step.

No

Securely connect the car-navigation 

unit connector.

9



Disconnect the car-navigation unit connector (6-
pin).  



Inspect both car-navigation unit connector and 
wiring harness-side connector for poor 
connection (such as damaged/pulled-out pins, 
corrosion).  



Are all the pins normal?  

Yes Go to the next step.

No

If the car-navigation unit connector 

is wrong:  



Replace the car-navigation unit. 

 

If the wiring harness-side connector 

is wrong:  



Repair or replace the pins and/or 

the connector.  

10



Inspect the following wiring harnesses between 
the microphone and HF/TEL unit. 



Terminal A (6-pin, MIC+)-terminal B 
(24-pin, MIC IN+)  



Terminal B (6-pin, MIC-)-terminal D (24-
pin, MIC IN-)  



Terminal C (6-pin, MIC +B)-terminal U 
(24-pin, MIC+B)  



Terminal D (6-pin, GND)-terminal F (24-
pin, MIC IN SHIELD)  



Terminal E (6-pin, MIC SENSE)-terminal 
J (24-pin, MIC SENSE)  



Is there open or short circuit?  

Yes

Repair or replace suspect wiring 
harness.

No

Go to the next step.

11



Inspect the following wiring harnesses between 
the hands-free unit and car-navigation unit. 



Terminal A (24-pin, MIC OUT+)-
terminal A (6-pin, MIC+)  



Terminal C (24-pin, MIC OUT-)-terminal 
B (6-pin, MIC-)  



Terminal E (24-pin, MIC OUT SHIELD)- 
terminal D (6-pin, GND)  



Terminal J (24-pin, MIC SENSE)- 
terminal E (6-pin, MIC SENSE)  



Is there open or short circuit?  

Yes

Repair or replace suspect wiring 
harness.

No

Replace the microphone, then go to 

the next step.

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Symptom Troubleshooting (Car Navigation System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:40:44 AM

Page 19 

© 2005 Mitchell Repair Information Company, LLC.