Mazda CX 7. Manual - part 362

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–17

09-03D

End Of Sie

NO.9 AUDIO SYSTEM ILLUMINATION DOES NOT ILLUMINATE AT ALL[ENTIRE AUDIO SYSTEM]

id0903e2825200

Diagnostic procedure

End Of Sie

NO.10 LCD DOES NOT DISPLAY AT ALL[ENTIRE AUDIO SYSTEM]

id0903e2825300

Diagnostic procedure

End Of Sie

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

STEP

INSPECTION

ACTION

1

• Are all illumination on the audio unit turned 

OFF?

Yes

Go to the next step.

No

Replace the center panel.

2

• Turn the ignition switch to the LOCK position.

• Inspect the fuse (ILLUMI).

• Is the fuse normal?

Yes

Go to the Step 4.

No

Go to the next step.

3

• Turn the ignition switch to the LOCK position.

• 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?

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.

4

• Inspect the connection of 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 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.

5

• Connect the audio unit connector (24-pin).

• 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?

Yes

Replace the audio unit.

No

Repair or replace the suspect wiring harness (TNS signal).

10

LCD does not display at all/Possible DTC: 09:Er20, 21:Er19

Troubleshooting hints

• Audio unit malfunction

• Information display malfunction

STEP

INSPECTION

ACTION

1

• Turn the audio unit to ON.

• Press both POWER ON/OFF and SEEK UP 

buttons for 0.2 seconds at the same time.

• Does the LCD display properly?

Yes

Go to the next step.

No

Replace the information display.

2

• Press either CLC or SET/INFO button on the 

information display.

• Does the beep sound?

Yes

Replace the audio unit.

No

Replace both audio unit and information display.
(CAN communication malfunction)

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SYMPTOM TROUBLESHOOTING [RADIO]

09-03E–1

09-03E

09-03E SYMPTOM TROUBLESHOOTING [RADIO]

FOREWORD[RADIO]  . . . . . . . . . . . . . . .  09-03E–1

Troubleshooting Index  . . . . . . . . . . . . .  09-03E–1
Quick Diagnostic Chart (Radio) . . . . . .  09-03E–2

CONFIRMATION STEP 1: RECEPTION 

CONDITION SYMPTOM (EXAMPLE)
[RADIO] . . . . . . . . . . . . . . . . . . . . . . . . .  09-03E–2

CONFIRMATION STEP 2: ANTENNA 

SYSTEM SYMPTOM (EXAMPLE)
[RADIO] . . . . . . . . . . . . . . . . . . . . . . . . .  09-03E–3

CONFIRMATION STEP 3: ANTENNA 

SYSTEM SIMPLE INSPECTION
[RADIO] . . . . . . . . . . . . . . . . . . . . . . . . .  09-03E–3

NO.1 NO RADIO RECEPTION 

(AM/FM)/NO OR LOW VOLUME
[RADIO] . . . . . . . . . . . . . . . . . . . . . . . . .  09-03E–3

NO.2 NOISE FROM RADIO (AM ONLY)

[RADIO] . . . . . . . . . . . . . . . . . . . . . . . . .  09-03E–5

NO.3 NOISE FROM RADIO (FM ONLY)

[RADIO]  . . . . . . . . . . . . . . . . . . . . . . . . . 09-03E–6

NO.4 CANNOT TUNE (SEEK DOES 

NOT STOP)[RADIO] . . . . . . . . . . . . . . . . 09-03E–8

NO.5 CANNOT PRESET (PRESET 

FUNCTION DOES NOT OPERATE)
[RADIO]  . . . . . . . . . . . . . . . . . . . . . . . . . 09-03E–9

NO.6 RECEPTION FREQUENCY OF 

RADIO SLIPS[RADIO] . . . . . . . . . . . . . . 09-03E–9

REFERENCE[RADIO]  . . . . . . . . . . . . . . . 09-03E–10

1. Multipath Noise . . . . . . . . . . . . . . . . . 09-03E–10
2. Flutter/Skip Noise  . . . . . . . . . . . . . . . 09-03E–10
3. Stereo and Monaural Receptions . . . 09-03E–10
Measures in Audio System . . . . . . . . . . 09-03E–10
Effect Setting of Separation Control and 

High Tone Control . . . . . . . . . . . . . . . . 09-03E–10

End of Toc

WM: AUDIO UNIT

FOREWORD[RADIO]

id0903e3803900

Note

• l If the case location, time, and broadcasting station etc. can be specified through interview with the 

customer, there is the possibility that the signal reception environment is the cause of the problem.

•  Perform confirmation of symptom and evaluation under conditions that customer reported (location, time, 

broadcasting station etc.). If not possible, perform it under equivalent conditions.

• Before inspection or repair, record the broadcasting stations that customer preset and reset them 

accordingly after the inspection or repair. Adjust the clock too.

Troubleshooting Index

No.

Symptom

Possible DTC

1

No radio reception (AM/FM)/No or low volume

09:Er20, 09:Er22

2

Noise from radio (AM only)

09:Er22

3

Noise from radio (FM only)

09:Er22

4

Cannot tune (SEEK does not stop)

09:Er20, 09:Er22

5

Cannot preset (preset function does not operate)

21:Er19

6

Reception frequency of radio slips

09:Er22

1871-1U-06B(09-03E).fm  1 ページ  ２００６年３月１６日　木曜日　午後４時１０分

SYMPTOM TROUBLESHOOTING [RADIO]

09-03E–2

Quick Diagnostic Chart (Radio)

End Of Sie

CONFIRMATION STEP 1: RECEPTION CONDITION SYMPTOM (EXAMPLE)[RADIO]

id0903e3804000

End Of Sie

1

2

3

4

5

6

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Troubleshooting item

Possible factor

Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc) 

Audio unit

Antenna plug poor connection

Antenna feeder

Electronic jamming from outside, or inferior condition of broadcasting station radio wave

Antenna rod not installed

Noise from electrical system on vehicle (e.g. fuel pump)

Battery

Charging system

Antenna installation loosened

Center panel

No r

adio reception (AM/FM)/No or lo

w v

olume

Noise from r

adio (AM only)

Noise from r

adio (FM only)

Cannot tune (SEEK does not stop)

Cannot preset (preset function does not oper

ate)

Reception frequency of r

adio slips

X: Applicable

acxuuw00000947

Symptom

Antenna signal condition

Source

Only a buzzing sound from 
the speakers

• There is no broadcasting wave.

• Signals from antenna to audio unit are not 

transmitted.

• Electric noise caused by the operation of 

internal circuit from audio unit itself

• Atmosphere noise

A buzzing or crunching sound 
and normal sound produced 
at the same time from the 
speakers

• Though signals are transmitted from 

antenna to audio unit, electric noise from 
other sources is larger.

• Electrical noise caused by operation of 

electrical component on vehicle

• Electrical noise from high tension wire, 

transformer substation (factory), electrical 
feeder line (street car), or motorcycle.

A thumping sound and 
normal sound produced at the 
same time from the speakers 
(FM only)

• Noise occurs due to radio wave 

environment at specific places (e.g. in 
valleys between buildings). Noise varies 
when own vehicle or surrounding vehicles 
moves. (FM only)

• Interference between direct and reflected 

waves of FM signals causes noise 
(Multipass noise).

1871-1U-06B(09-03E).fm  2 ページ  ２００６年３月１６日　木曜日　午後４時１０分