Mazda CX 7. Manual - part 358

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–1

09-03D

09-03D SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO 
SYSTEM]

FOREWORD

[ENTIRE AUDIO SYSTEM] . . . . . . . . . .  09-03D–1

Troubleshooting Index  . . . . . . . . . . . . .  09-03D–1
Quick Diagnostic Chart 

(Entire Audio System)  . . . . . . . . . . . .  09-03D–2

CONFIRMATION STEP 1: AUDIO PANEL

SWITCH CONFIRMATION[ENTIRE 
AUDIO SYSTEM]. . . . . . . . . . . . . . . . . .  09-03D–3

How to activate audio panel switch 

confirmation mode . . . . . . . . . . . . . . .  09-03D–3

CONFIRMATION STEP 2: AUDIO 

CONTROL SWITCH CONFIRMATION
[ENTIRE AUDIO SYSTEM] . . . . . . . . . .  09-03D–3

NO.1 AF NOISE OR POP NOISE ON ALL 

SOURCES (RADIO, CD, CASSETTE 
TAPE)[ENTIRE AUDIO SYSTEM]. . . . .  09-03D–4

NO.2 NO POWER ON THE ENTIRE 

AUDIO SYSTEM
[ENTIRE AUDIO SYSTEM] . . . . . . . . . .  09-03D–5

NO.3 NO SOUND FROM ALL 

SPEAKERS
[ENTIRE AUDIO SYSTEM] . . . . . . . . . .  09-03D–6

Vehicles Without Bose . . . . . . . . . . . . .  09-03D–6

Vehicles With Bose . . . . . . . . . . . . . . . . 09-03D–7

NO.4 NO SOUND FROM CERTAIN 

SPEAKER[ENTIRE 
AUDIO SYSTEM]  . . . . . . . . . . . . . . . . . . 09-03D–10

Vehicles Without Bose. . . . . . . . . . . . . . 09-03D–10
Vehicles With Bose . . . . . . . . . . . . . . . . 09-03D–11

NO.5 BROKEN SOUND OR POOR 

SOUND QUALITY
[ENTIRE AUDIO SYSTEM]  . . . . . . . . . . 09-03D–14

NO.6 SOUND BECOMES LOUD OR 

WEAK WHILE DRIVING THE VEHICLE
[ENTIRE AUDIO SYSTEM]  . . . . . . . . . . 09-03D–15

NO.7 ALC FUNCTION IS INOPERATIVE

[ENTIRE AUDIO SYSTEM]  . . . . . . . . . . 09-03D–16

NO.8 AUDIO PILOT FUNCTION IS 

INOPERATIVE
[ENTIRE AUDIO SYSTEM]  . . . . . . . . . . 09-03D–16

NO.9 AUDIO SYSTEM ILLUMINATION 

DOES NOT ILLUMINATE AT ALL
[ENTIRE AUDIO SYSTEM]  . . . . . . . . . . 09-03D–17

NO.10 LCD DOES NOT DISPLAY AT 

ALL[ENTIRE AUDIO SYSTEM] . . . . . . . 09-03D–17

End of Toc

WM: AUDIO UNIT

FOREWORD[ENTIRE AUDIO SYSTEM]

id0903e2802700

Note

• Record all radio programs set by customer prior to the repairs. Set all radio programs and adjust the time 

after repairs.

Troubleshooting Index

No.

Symptom

Possible DTC

1

AF noise or POP noise on all sources (Radio, CD, Cassette tape)

09:Er20, 09:Er21

2

No power on the entire audio system

09:Er20

3

No sound at all

00:Er04, 00:Er10, 03:Er07, 03:Er10, 
09:Er20, 09:Er21

4

No sound from some speaker

— 

5

Broken sound or poor sound quality

09:Er21

6

Sound becomes loudly or weakly while driving the vehicle

— 

7

ALC function is inoperative (without Bose)

16:Er12

8

Audio pilot function is inoperative (with Bose)

16:Er12

9

Audio system illumination does not illuminate at all.

09:Er20, 21:Er19

10

LCD does not display at all.

09:Er20, 21:Er19

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SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–2

Quick Diagnostic Chart (Entire Audio System)

Open circuit in wiring harness between audio unit and speaker (without Bose)

Short circuit inside speaker

Short circuit in wiring harness between audio unit and speaker (without Bose)

Open or short circuit in power supply (ACC) wiring harness

Open or short circuit in power supply (B+) wiring harness

Burnt fuse (B+)

Burnt fuse (ACC)

Audio unit malfunction

Antenna malfunction (e.g., poor ground)

Speaker malfunction (e. g., any foreign material, broken)

Poor connection of audio unit connector, terminal damage

Improper speaker installation

Jammed radio signals from after market equipment

Low vehicle battery voltage

AF noise or POP noise on all sources (Radio

, CD

,  Cassette tape)

No po

w

er on the entire audio system

No sound at all

No sound from some speak

ers

Brok

en sound or poor sound quality

Sound becomes loud or w

eak while dr

iving the v

ehicle

ALC function is inoper

ativ

e (without Bose)

A

udio system illumination does not illuminate at all.

LCD does not displa

y at all.

1

2

3

4

5

6

7

8

9

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

X

X

X

X

X

X

X

Vibration of door trim and/or package trim

CAN signal wiring harness malfunction

Open or short circuit in vehicle speed signal wiring harness (e.g., instrument cluster)

Burnt fuse (TNS signal)

Open or short circuit in TNS signal wiring harness

Center panel malfunction

Information display malfunction

X: Applicable

X

X

10

A

udio pilot function is inoper

ativ

e (with Bose)

Audio amplifier malfunction (with Bose)

Open or short circuit in wiring harness between audio amplifier and ground (with Bose)

Open or short circuit in wiring harness between audio amplifier and speaker (with Bose)

Open or short circuit in wiring harness between audio amplifier and audio unit (with Bose)

Poor connection of audio amplifier connector, terminal damage (with Bose)

Open or short circuit in Mic unit signal wiring harness

Open or short circuit in Audio Pilot signal wiring harness 

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

acxuuw00001154

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SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–3

09-03D

End Of Sie

CONFIRMATION STEP 1: AUDIO PANEL SWITCH CONFIRMATION[ENTIRE AUDIO SYSTEM]

id0903e2802800

• Verify the customer complaint and identify either the center panel malfunction or audio unit malfunction.

How to activate audio panel switch confirmation mode

1. Turn the audio system to ON.
2. Press both POWER SW and MEDIA buttons for a second at the same time.
3. The audio panel switch confirmation mode is now activated.

End Of Sie

CONFIRMATION STEP 2: AUDIO CONTROL SWITCH CONFIRMATION[ENTIRE AUDIO SYSTEM]

id0903e2802900

• Verify the customer complaint and identify either the audio control switch malfunction or audio unit malfunction.

End Of Sie

STEP

INSPECTION

ACTION

1

• Press each button on the center panel.

• Does buzzer sound when pressing each 

button?

Yes

Verify the customer complaint and then go to the 
appropriate symptom troubleshooting procedure.

No

Go to the next step.

2

• Disassemble and reassemble the center 

panel and audio unit.

• Activate the audio panel switch confirmation 

mode.

• Does buzzer sound when pressing each 

button?

Yes

Go to the next step.

No

Replace the center panel.

3

• Does the audio system operate properly?

Yes

The system is normal.

No

Verify the customer complaint and then go to the 
appropriate symptom troubleshooting procedure.

STEP

INSPECTION

ACTION

1

• Is the symptom related to either the audio 

control switch or audio panel operation?

Yes

Verify the customer complaint and then go to the 
appropriate symptom troubleshooting procedure.

No

The symptom is related to the audio panel 

operation:

• Follow the “Confirmation Step 1”.

The symptom is related to the audio control 

switch operation:

• Go to the next step.

2

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

• Inspect both the audio unit and wiring 

harness-side connectors for poor 
connection. (such as damaged/pulled-out 
pins, corrosion).
— Terminal N (ST SW1)

— Terminal P (ST SW2)

• Are all the pins normal?

Yes

Go to the next step.

No

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.

3

• Inspect the continuity between the audio unit 

wiring harness-side connector terminal N 
and P while operating the audio control 
switch.

• Does the resistance change?

Yes

Verify the customer complaint and then go to the 
appropriate symptom troubleshooting procedure.

No

Go to the next step.

4

• Turn the ignition switch to the LOCK position.

• Remove the audio control switch.

• Inspect the continuity between the audio unit 

wiring harness-side connector (24-pin) 
terminal and the audio control switch wiring 
harness-side connector (8-pin) terminal.
— Terminal N (24-pin) —  Terminal G (8-pin)

— Terminal P (24-pin) —  Terminal H (8-pin)

• Is there the continuity?

Yes

Replace the audio control switch.

No

Repair or replace the suspect wiring harness.

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SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–4

NO.1 AF NOISE OR POP NOISE ON ALL SOURCES (RADIO, CD, CASSETTE TAPE)[ENTIRE AUDIO 
SYSTEM]

id0903e2803000

Diagnostic procedure

1

AF noise or POP noise on all sources (Radio, CD, Cassette tape)/Possible DTC: 09:Er20, 09:Er21

Troubleshooting hints

• Low vehicle battery voltage.

• Jammed radio signals from after market equipment.

• Speaker malfunction (e.g., any foreign material, broken)

• Improper speaker installation

• Audio unit malfunction

• Poor connection of audio unit connector, terminal damage

• Poor connection of audio amplifier connector, terminal damage (with Bose)

• Antenna malfunction (e.g., poor ground)

Note

• AF noise is a snapping noise that generally occurs during ON/OFF switching operations of electrical equipment other 

than the audio unit, or a continual rasping noise that occurs when electrical equipment is operated. This is caused by 
noise interference in the power supply wiring, signal wiring, speaker cable or head of cassette deck. Therefore noise can 
be heard regardless of radio wave conditions or the audio volume position. The noise will start after one click from the 
minimum position of the volume button but normally does not change even when volume is turned to a higher position.

• POP noise is snapping or popping noise that occurs during ON/OFF switching operation of the audio unit, or when 

switching from radio to CD. Even a normal audio unit sometimes emits a little noise depending on the conditions.

STEP

INSPECTION

ACTION

1

• Inspect the vehicle battery voltage.

• Is the vehicle battery voltage normal?

Specification:

Ignition switch ON: 11.5 V or more
Idle: 12.5 V or more

Yes

Go to the next step.

No

Charge the battery, then go to the next step.

2

• Turn the audio system to ON.

• Is there any noise?

Yes

Go to the next step.

No

The system is normal. Explain to the customer that the 
vehicle battery voltage was low.

3

• Is any of the following after-market 

equipment installed? (Inspect especially near 
the antenna.)
— Radar

— Remote engine starter

— Anti-theft device

— Other

Yes

Go to the next step.

No

Go to the Step 5.

4

• Remove the after-market equipment.

• Turn the audio system to ON.

• Is there any noise?

Yes

Go to the next step.

No

The system is normal. The after-market electrical devices 
might make a noise.

5

• Is there the noise from all speakers?

Yes

Go to the Step 7.

No

Go to the next step.

6

• Inspect the suspect speaker.

• Is the speaker normal?

Yes

Go to the next step.

No

If there is any foreign material on the speaker:

• Remove the foreign material from the speaker.

If the speaker is malfunctioning:

• Replace the speaker.

If the speaker is not installed properly:

• Install the speaker properly.

7

• Attempt to duplicate the symptom on the 

other vehicle.

• Is the noise better than the customer’s 

vehicle?

Yes

Go to the next step.

No

The system is normal. Explain the noise generation 
mechanism to the customer.

Note

• The noise may be heard depends on the operating 

speed of audio power and/or mode switch.

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