Mazda CX 7. Manual — part 359

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–5

09-03D

End Of Sie

NO.2 NO POWER ON THE ENTIRE AUDIO SYSTEM[ENTIRE AUDIO SYSTEM]

id0903e2803100

Diagnostic procedure

8

• Turn the ignition switch to the LOCK position.

• Remove the audio unit.

• Inspect the connection of the audio unit

connector (24-pin) (for sound signal line).

• Is the connector connected securely?

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.

After treating either the above-mentioned, then go to the
next step.

9

• Is there any noise?

Yes

Go to the next step.

No

The system is normal.

10

• Inspect the ground condition of the antenna.

• Is the ground condition normal?

Yes

Go to the next step.

No

Repair or replace the ground. Go to the next step.

11

• Is there any noise?

Yes

Without Bose:

Replace the audio unit.

(See 09-20-4 AUDIO UNIT REMOVAL/INSTALLATION.)
(See 09-20-5 AUDIO UNIT DISASSEMBLY/
ASSEMBLY.)

With Bose:

• If noise occurs from the speaker of a specific channel, or

the volume is minimized and the noise occurs:
— Replace the audio amplifier.

(See 09-20-6 AUDIO AMPLIFIER REMOVAL/

INSTALLATION.)

• If noise occurs from the speaker of two or more channels

or the volume is minimized and the noise dose not
occurs:
— Replace the audio unit.

(See 09-20-4 AUDIO UNIT REMOVAL/

INSTALLATION.)

(See 09-20-5 AUDIO UNIT DISASSEMBLY/

ASSEMBLY.)

No

The system is normal.

STEP

INSPECTION

ACTION

2

No power on the entire audio system/Possible DTC: 09:Er20

Troubleshooting hints

• Poor connection of audio unit connector, terminal damage

• Audio unit malfunction

• Burnt fuse (B+)

• Burnt fuse (ACC)

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

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

STEP

INSPECTION

ACTION

1

• Turn the ignition switch to the LOCK position.

• Inspect the following fuses:

— RADIO

— ROOM

• Are the fuse normal?

Yes

Go to the next step.

No

Replace with the appropriate standard fuse.

• If the fuse is melted, inspect the wiring harness for short

to ground. Repair or replace the wiring harness, then
replace the fuse.

2

• Remove the audio unit.

• Inspect the connection of the audio unit

connector (24-pin).

• Disconnect the audio unit connector and

inspect both the audio unit and wiring
harness-side connectors for poor
connection. (such as damaged/pulled-out
pins, corrosion).
— Terminal B (B+)

— Terminal R (ACC)

— Terminal W (GND)

• 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.

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SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–6

End Of Sie

NO.3 NO SOUND FROM ALL SPEAKERS[ENTIRE AUDIO SYSTEM]

id0903e2803200

Vehicles Without Bose

Diagnostic procedure

3

• Connect the audio unit connector.

• Inspect the voltage for the power supply line

(B+, ACC).

Specification:

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

• Is the voltage normal?

Yes

Go to the next step.

No

Repair or replace the suspect wiring harness.

4

• Turn the ignition switch to the LOCK position.

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

• Inspect the continuity between the audio unit

wiring harness-side connector terminal W
and the ground.

• Is there the continuity?

Yes

Replace the audio unit.

No

Repair or replace the wiring harness.

STEP

INSPECTION

ACTION

3

No sound from all speakers/Possible DTC: 00:Er04, 00:Er10, 03:Er07, 03:Er10, 09:Er20, 09:Er21

Troubleshooting hints

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

• Audio unit malfunction

• Short circuit in wiring harness between audio unit and speaker

• Short circuit inside speaker

STEP

INSPECTION

ACTION

1

• Press AUDIO CONT button more than 2

second.

• Play the CD or Radio.

• Adjust the volume between ”10” to “15”.

• Is there sound?

Yes

The system is normal.

No

Go to the next step.

2

• Turn the ignition switch to the LOCK position.

• Remove the audio unit.

• Disconnect the audio connector (24-pin).

• Inspect the continuity between the audio unit

wiring harness-side connector terminal and
ground:

For front door speaker

— Terminal A (L+) — GND

— Terminal C (L-) — GND

— Terminal D (R+) — GND

— Terminal F (R-) — GND

For rear door speaker

— Terminal S (L+) — GND

— Terminal U (L-) — GND

— Terminal V (R+) — GND

— Terminal X (R-) — GND

— Is there continuity?

Yes

Repair or replace the suspect wiring harness or speaker
unit.

Note

• If there is a short circuit between the speaker harness

or speaker lead wire and ground, the protector circuit
inside the audio unit operates to cut the sound.

No

Go to the next step.

3

• Remove the speaker.

• Disconnect the speaker connector (2-pin).

• Inspect the continuity between the speaker

wiring harness-side connector (2-pin)
terminal and ground:

For each speaker

— Terminal A — GND

— Terminal B — GND

• Is there continuity?

Yes

Replace the speaker.

No

Replace the audio unit.

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SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–7

09-03D

Vehicles With Bose

Diagnostic procedure

3

No sound from all speakers/Possible DTC: 00:Er04, 03:Er07, 03:Er10, 09:Er20, 09:Er21

Troubleshooting hints

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

• Audio amplifier malfunction

• Open or short circuit in wiring harness between audio amplifier and speaker

• Open or short circuit in wiring harness between audio amplifier and audio unit

• Short circuit inside speaker

STEP

INSPECTION

ACTION

1

• Press AUDIO CONT button more than 2

seconds.

• Play CD or radio.

• Adjust the volume between “10” and “15”.

• Is there sound?

Yes

The system is normal.

No

Go to the next step.

2

• Measure the voltage at the audio amplifier

terminal A (8-pin, vehicle harness-side)

• Is the voltage B+?

Yes

Go to Step 4.

No

Repair or replace wiring harness between the audio
amplifier and fuse.
(See 09-20-6 AUDIO AMPLIFIER REMOVAL/
INSTALLATION.)
Go to the next step.

3

• Is there any sound?

Yes

The system is normal.

No

Go to the next step.

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SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]

09-03D–8

4

• Turn the ignition switch to the LOCK position.

• Disconnect the audio amplifier connector

(40-pin).

• Inspect continuity between the following

terminals of the audio amplifier connector
and speaker connector.

For front speaker (LH)

— Terminal 2A (40-pin)— Terminal A

(speaker)

— Terminal 2B (40-pin)— Terminal B

(speaker)

For front speaker (RH)

— Terminal 2F (40-pin)— Terminal A

(speaker)

— Terminal 2D (40-pin)— Terminal B

(speaker)

For front door speaker (LH)

— Terminal 2N (40-pin)— Terminal A

(speaker)

— Terminal 2I (40-pin)— Terminal B

(speaker)

For front door speaker (RH)

— Terminal 2M (40-pin)— Terminal A

(speaker)

— Terminal 2R (40-pin)— Terminal B

(speaker)

For rear door speaker (LH)

— Terminal 2G (40-pin)— Terminal A

(speaker)

— Terminal 2I (40-pin)— Terminal B

(speaker)

For rear door speaker (RH)

— Terminal 2E (40-pin)— Terminal A

(speaker)

— Terminal 2C (40-pin)— Terminal B

(speaker)

For rear speaker (LH)

— Terminal 2J (40-pin)— Terminal A

(speaker)

— Terminal 2H (40-pin)— Terminal B

(speaker)

For rear speaker (RH)

— Terminal 1F (40-pin)— Terminal A

(speaker)

— Terminal 1H (40-pin)— Terminal B

(speaker)

For center speaker

— Terminal 1E (40-pin)— Terminal A

(speaker)

— Terminal 1G (40-pin)— Terminal B

(speaker)

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace the repair related wiring harnesses.

STEP

INSPECTION

ACTION

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