Mazda CX 7. Manual - part 372

SYMPTOM TROUBLESHOOTING [CAR-NAVIGATION SYSTEM]

09-03H–9

09-03H

NO.6 DISPLAY SCREEN DOES NOT CHANGE TO THE NIGHT MODE. (FRONT AND REAR COMBINATION 
LIGHTS OPERATE NORMALLY.)[CAR-NAVIGATION SYSTEM]

id0903e8812400

Diagnostic procedure

End Of Sie

6

Display screen does not change to the night mode. (Front and rear combination lights operate 
normally.)

POSSIBLE CAUSE

• Improper setting of NAVI map indication

• Open or short circuit in TNS signal wiring harness (TNS signal related)

• audio unit malfunction

• Poor connection of the audio unit connector, terminal damage

• Car-navigation unit malfunction

Note

• The car-navigation control switch is inoperative if the following circuit has malfunction

— audio unit connector (24-pin) terminal I (UART-2)— car-navigation unit connector (24-pin) 

terminal N (UART-2)

— audio unit connector (24-pin) terminal E (UART-1)— car-navigation unit connector (24-pin) 

terminal P (UART-1)

• When the ignition switch is turned to OFF, then ACC position, display screen changes to black.

STEP

INSPECTION

ACTION

1

• Turn the ignition switch to the ON position.

• Does the display screen change to the night 

mode when the light switch is turned to the 
TNS position, and the dimmer cancel switch 
is turned to OFF?

Yes

The system is normal.

No

Go to the next step.

2

• Press the “MENU” button.

• Select “Navigation Set Up”.

• Select “User Setting”.

• Inspect “MAP Mode”.

• Is the “MAP Mode” set to “Auto”?.

Yes

Go to the next step.

No

System is normal.
Set the “MAP Mode” to “Auto”.

3

• Start diagnostic function is started.

• Turn the light switch to TNS position.

• Inspect the “TNS” on the diagnosis check 

screen.

• Does the “TNS” indicate “ON”?

Yes

Replace the car-navigation unit. (See 09-20-5 CAR-
NAVIGATION UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

4

• Turn the ignition switch to the LOCK position.

• Remove the audio unit. (See 09-20-4 AUDIO 

UNIT REMOVAL/INSTALLATION.)

• Inspect the connection of the audio unit 

connector (24-pin).

• Is the connector securely connected?

Yes

Go to the next step.

No

Securely connect the audio unit connector.

5

• Disconnect the audio unit 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?

Yes

Go to the next step.

No

If the audio unit side connector is wrong:

• Replace the audio unit. (See 09-20-4 AUDIO UNIT 

REMOVAL/INSTALLATION.)

If the wiring harness-side connector is wrong:

• Repair or replace the pins and/or the connector.

6

• Inspect the voltage of the audio unit wiring 

harness-side connector (24-pin) terminal E 
(TNS signal)

• Is voltage B+ when the light switch is turned 

to the TNS position?

Yes

Replace the audio unit, then go to the next step. (See 09-20-
4 AUDIO UNIT REMOVAL/INSTALLATION.)

No

Inspect for TNS signal circuit.
Repair or replace if necessary.

7

• Does system work properly?

Yes

Troubleshooting is completed.

No

Replace the car-navigation unit.

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SYMPTOM TROUBLESHOOTING [CAR-NAVIGATION SYSTEM]

09-03H–10

NO.7 DISPLAY DOES NOT CHANGE TO THE BACK CAMERA IMAGE.[CAR-NAVIGATION SYSTEM]

id0903e8808300

Diagnostic procedure

End Of Sie

7

Display does not change to the back camera image

POSSIBLE CAUSE

• Back camera malfunction

• Poor connection of the back camera connector, terminal damage

• audio unit malfunction

• Poor connection of the audio unit connector, terminal damage

• Open or short circuit in wiring harness between audio unit and rear view monitor

• Open or short circuit in reverse signal wiring harness

STEP

INSPECTION

ACTION

1

• Is the lens of the back camera dirty with 

garbage, dust?

Yes

Clean the lens of the back camera.

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.

5

• Inspect the following wiring harnesses 

between the audio unit and rear view 
monitor.
— 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?

Yes

Go to the next step.

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.

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SYMPTOM TROUBLESHOOTING [CAR-NAVIGATION SYSTEM]

09-03H–11

09-03H

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

id0903e8812500

Diagnostic procedure

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

1

• Turn the ignition switch to the ACC position.

• 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?

Yes

Go to the next step.

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:

• 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.

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SYMPTOM TROUBLESHOOTING [CAR-NAVIGATION SYSTEM]

09-03H–12

End Of Sie

REFERENCE INFORMATION[CAR-NAVIGATION SYSTEM]

id0903e8802600

Starting Procedure For Diagnostic Function

1. Turn the ignition switch to the ACC or ON position.
2. Press the MENU button.
3. Select “Navigation Set Up”.
4. Select “Calibration”.
5. Select “Map Version”.
6. Press the joystick up two times, then down two times.
7. “Diagnosis Check” is displayed on the screen.
8. Select the “Diagnosis Check”.

10

• Inspect the following wiring harnesses 

between the microphone and car-navigation 
unit.
— Terminal A (6-pin, MIC+)— terminal A (6-

pin, MIC+)

— Terminal B (6-pin, MIC-)— terminal B (6-

pin, MIC-)

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

(6-pin, MIC B+)

— Terminal D (6-pin, GND)— terminal D (6-

pin, GND)

— Terminal E (6-pin, MIC SENSE)— 

terminal E (6-pin, MIC SENSE)

• Is there open or short circuit?

Yes

Replace the microphone, then go to the next step.

No

Inspect the suspect wiring harness.
Repair or replace if necessary.

11

• Does the fault phenomenon improve?

Yes

Troubleshooting is completed.

No

Replace the car-navigation unit.

STEP

INSPECTION

ACTION

Diagnosis  Check

REV

Microphone

SPEED  (kph, mph)

MENU

TNS

GPS Antenna

Traffic System

OFF

OK

0  ,  0

OFF

OK

TMC

Microphone  Check

Please Speak at a Normal Level into the Microphone.

Microphone input level judging

Microphone level:

PTT switch status:

<   Please Push switch   >

9

8

7

5

4

3

6

1

2

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No.

Display item

Description

1

REV

Indicate Reverse signal state.

• ON: Reverse

• OFF: Others

2

Microphone

Indicate the connection state of a microphone.

• OK: Connect

• NCON: Disconnect

3

Speed

*

Indicate the present vehicle speed by kph/mph (a maximum of 3 digits).

4

TNS

*

Indicate TNS signal state.

• ON: Turn TNS ON

• OFF: Turn TNS OFF

5

GPS Antenna

*

Indicate the connection state of a GPS antenna.

• OK: Connect

• NCON: Disconnect

6

Traffic system

Indicate the RDS-TMC system availability on the vehicle.

• TMC: Equip

7

PTT switch status

Indicate the state of a VOICE button.

• <OK>: Press the button (Keep the state until the screen is changed.)

• <Please Push Switch>: Other than above condition

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