Yes

USB device is not compatible

No

Go to step 5.

Yes

Go to step 6.

Page 4 of 15
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2020 Mazda North American Operations, U.S.A.
07/16/2020 3:01 PM tlawrenc

Service Alert No.: SA-027/20

Last Issued: 07/16/2020

Does the reboot continue after ignition key OFF
then back ON?

Check / Replace the CMU.
No

1. Retrieve the data log if possible
before replacing the CMU
2. Document date and time of the
condition
Check / Replace the CMU.

6

Does the reboot continue after vehicle battery
disconnect?

Yes

No

1. Retrieve the data log if possible
before replacing the CMU
2. Document date and time of the
condition
No repair needed.

No. 4 Infotainment System Has No Sound
Step

Inspection

Result

Action

1

Using M-MDS, are any infotainment system Yes
DTC's stored?
No

Go to MGSS for DTC diagnosis

2

Is sound normal other than navigation
guidance?

Yes

Go to step 3.

No

Go to step 4.

3

Can you hear the voice after raising the
navigation volume?

Yes

Normal Operation.

No

Go to step 5.

4

Can you hear sound after turning on audio
mode?

Yes

Normal Operation.

No

Go to step 6.

Yes

Complete

Go to step 2.

Check / Replace the CMU. Retrieve

5

Replace the Navigation SD Card. Can you
hear voice after Navigation SD Card
replacement?

6

Can you hear sound after raising the volume Yes
of audio?
No

Normal Operation

7

Source: USB/iPod
Are there any problems with the media and
Yes
the music files?
Source: Radio

Source: USB/iPod
Check the media and the compatible files.
Source: Radio
Check the antenna, the reception, and the

No

1. Retrieve the data log if possible before
replacing the CMU
2. Document date and time of the condition
Go to step 7.

Page 5 of 15
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2020 Mazda North American Operations, U.S.A.
07/16/2020 3:01 PM tlawrenc

Service Alert No.: SA-027/20

Last Issued: 07/16/2020

Are there any problems with the antenna
and the reception?
Source: Bluetooth Audio
Are there any problems with Bluetooth?

Remote Tuner side.
Source: Bluetooth Audio
Check the Bluetooth connection and the
Bluetooth device.
No

8

Go to MGSS "DIAGNOSTIC ASSIST FUNCTION
[CONNECTIVITY MASTER UNIT (US)]"
Perform Functional Inspection/Adjustment - Pass
Active Speaker Check Function - Speaker
Inspection.
Did the Speaker Inspection Pass?
Fail

Go to step 8.
Check / Replace the CMU. Retrieve
1. Retrieve the data log if possible before
replacing the CMU
2. Document date and time of the condition
Go to step 9.

9

Is the connector for the Speaker(s) that
failed inserted correctly?

Yes

Go to step 10.

No

Insert the connector correctly.

10

Is the connector for the amplifier inserted
correctly?

Yes

Go to step 11.

No

Insert the connector correctly.

11

Are the CMU connectors inserted correctly?

Yes

Go to step 12.

No

Insert the connectors correctly.

12

Swap speakers from good known vehicle.
Can you hear sound?

Yes

Check / Replace the speakers.

No

Go to step 13.

13

Swap the Amplifier from known good
vehicle. Can you hear sound?

Yes

Check / Replace the Amplifier.

No

Go to step 14.
Check / Replace the CMU.

Yes
14

Swap the CMU from known good vehicle.
Can you hear sound?
No

1. Retrieve the data log if possible before
replacing the CMU
2. Document date and time of the condition
Repair/Replace wiring harness. Go to MGSS
View Content - Wiring Diagram - Body and
Accessories - Entertainment System.

No. 5 Commander Switch Does Not Work
Step

Inspection

Result

Action

1

Using M-MDS, are any infotainment system
DTC's stored?

Yes

Go to MGSS for DTC diagnosis

No

Go to step 2.

2

Does the Commander Switch work correctly?

Yes

Go to step 3.
Page 6 of 15

CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2020 Mazda North American Operations, U.S.A.
07/16/2020 3:01 PM tlawrenc

Service Alert No.: SA-027/20

Last Issued: 07/16/2020

No

Go to step 4.

Yes

Normal Operation.

No

Go to step 5.

Yes

Go to SA-025/19.

No

Go to step 8.

3

Does the Steering Wheel Switch work
correctly?

4

Is fuse F13 missing?

Pass

Go to step 6.

5

Go to MGSS "DIAGNOSTIC ASSIST FUNCTION
[CONNECTIVITY MASTER UNIT (US)]"
Perform Functional Inspection/Adjustment Steering SW Inspection - Did the Steering SW
Inspection Pass?

Fail

Go to MGSS STEERING SWITCH INSPECTION.

6

Is the connector for the CMU inserted
correctly?

Yes

Go to step 7.

No

Insert the connector correctly.
Check / Replace the CMU.

Yes
7

Swap the CMU from known good vehicle. Does
the Steering Wheel Switch work correctly?
No

8

Go to MGSS "DIAGNOSTIC ASSIST FUNCTION
[CONNECTIVITY MASTER UNIT (US)]"
Perform Functional Inspection/Adjustment Touch Pad/Commander Inspection Commander switch inspection.
Did the Commander switch inspection Pass?

1. Retrieve the data log if possible before
replacing the CMU
2. Document date and time of the
condition
Repair/Replace wiring harness. Go to MGSS
View Content - Wiring Diagram - Body and
Accessories - Entertainment System.
Check / Replace the CMU.

Pass

1. Retrieve the data log if possible before
replacing the CMU
2. Document date and time of the
condition

Fail

Go to step 9.

Yes

Go to step 10.

No

Insert the connector correctly.

Yes

Go to step 11.

No

Insert the connectors correctly.

9

Is the connector for the Commander Switch
inserted correctly?

10

Are the CMU connectors inserted correctly?

11

Swap the Commander Switch with good known Yes
vehicle. Does the Commander Switch work
No
correctly?

Check / Replace the Commander Switch.
Go to step 12.

Page 7 of 15
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers