NHTSA ID Number: 11034443
Manufacturer Communication Number: SA-039-26
TSB/Document Date: 2026-07-03
Summary
This Service Alert supersedes the previously issued SA listed below. The changes are noted in Red text. SA-012/25 10/06/25, 08/21/25, 05/15/25 and 02/27/25 DESCRIPTION Customers having MAZDA
CONNECT concerns should have their vehicle repaired using the following repair procedure. REPAIR PROCEDURE NOTE: Before proceeding: Document the vehicle's current MAZDA CONNECT CMU software version. • 2019-2022 Models - Go to TSB 16-003/23 and confirm the CMU Serial Number is not within the affected range. • Document customer device Brand/Model/Model Number/software version on the repair order. • Confirm that the Connectivity Master Unit (CMU) is updated to the latest software version. Go to MGSS -> Infotainment -> MAZDA CONNECT Updates ○ • If possible, complete the Microsoft Forms Questionnaire. Go to MGSS -> Infotainment -> MAZDA CONNECT Questionnaire.
Does the reboot continue after vehicle battery
disconnect?
Yes
No
No repair needed.
No. 3 Infotainment System Has No Sound
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
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
Yes
Normal Operation.
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mode?
No
Go to step 6.
Yes
Repair complete.
Check / Replace the CMU.
5
Replace the Navigation SD Card. Can you
hear voice after Navigation SD Card
replacement?
6
Can you hear sound after raising the volume
of audio?
7
<< Source: USB/iPod >>
Are there any problems with the media and the
music files?
<< Source: Radio >>
Are there any problems with the antenna and
the reception?
<< Source: Bluetooth Audio >>
Are there any problems with Bluetooth?
• Retrieve CMU log data if possible
before replacing the CMU.
Important Note
• Document date and time of the
condition.
• If necessary, contact Hotline for
additional support.
• See Warranty Information Note.
○
No
Yes
Normal Operation.
No
Go to step 7.
Yes
<< Source: USB/iPod >>
Check the media and the compatible files.
<< Source: Radio >>
Check the antenna, the reception, and the
Remote Tuner side.
<< Source: Bluetooth Audio >>
Check the Bluetooth connection and the
Bluetooth device.
No
Go to step 8.
Check / Replace the CMU.
8
9
10
Go to MGSS "DIAGNOSTIC ASSIST
FUNCTION [CONNECTIVITY MASTER UNIT
(US)]" and
perform Functional Inspection/Adjustment ->
Active Speaker Check Function -> Speaker
Inspection.
Did the Speaker Inspection Pass?
• Retrieve CMU log data if possible
before replacing the CMU.
Important Note
• Document date and time of the
condition.
• If possible, complete the Microsoft
Forms Questionnaire. Go to MGSS > Infotainment -> MAZDA
CONNECT Questionnaire.
• See Warranty Information Note.
○
Pass
Fail
Go to step 9.
Is the connector for the Speaker(s) that failed
inserted correctly?
Yes
Go to step 10.
No
Insert the connector correctly.
Is the connector for the amplifier inserted
correctly?
Yes
Go to step 11.
No
Insert the connector correctly.
Yes
Go to step 12.
No
Insert the connectors correctly.
Yes
Check / Replace the speakers.
11 Are the CMU connectors inserted correctly?
12 Swap speakers from good known vehicle. Can
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06/16/2026 02:24 PM tlawrenc
you hear sound?
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.
14
Swap the Remote Tuner from known good
vehicle. Can you hear sound?
Yes
Check / Replace the Remote Tuner
No
Go to step 15.
Check / Replace the CMU.
• Retrieve CMU log data if possible
before replacing the CMU.
Important Note
• Document date and time of the
condition.
• If possible, complete the Microsoft
Forms Questionnaire. Go to MGSS > Infotainment -> MAZDA
CONNECT Questionnaire.
• See Warranty Information Note.
○
Swap the CMU from known good vehicle. Can
you hear sound?
Yes
15 IMPORTANT NOTE: CMUs are VIN-locked.
When swapping a CMU from a known good
vehicle, always return it to the original vehicle
after troubleshooting is complete.
No
Repair/Replace wiring harness. Go to
MGSS View Content -> Wiring Diagram ->
Body and Accessories -> Entertainment
System.
Result
Action
No. 4 Commander Switch Does Not Work
Step
Inspection
Yes
Go to MGSS for DTC diagnosis.
No
Go to step 2.
Yes
Go to step 3.
No
Go to step 4.
Does the Steering Wheel Switch work
correctly?
Yes
Normal Operation.
No
Go to step 4.
Pass Go to step 5.
4
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.
5
Is the connector for the CMU inserted
correctly?
Yes
Go to step 6.
No
Insert the connector correctly.
1
Using M-MDS, are any infotainment system
DTC's stored?
2
Does the Commander Switch work correctly?
3
6
Swap the CMU from known good vehicle.
Does the Steering Wheel Switch work
correctly?
Check / Replace the CMU.
Yes
• Retrieve CMU log data if possible
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06/16/2026 02:24 PM tlawrenc
IMPORTANT NOTE: CMUs are VIN-locked.
When swapping a CMU from a known good
vehicle, always return it to the original vehicle
after troubleshooting is complete.
before replacing the CMU.
Important Note
• Document date and time of the
condition.
• If possible, complete the Microsoft
Forms Questionnaire. Go to MGSS > Infotainment -> MAZDA
CONNECT Questionnaire.
• See Warranty Information Note.
○
No
Repair/Replace wiring harness. Go to
MGSS View Content -> Wiring Diagram ->
Body and Accessories -> Entertainment
System.
Check / Replace the CMU.
7
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?
8
Is the connector for the Commander Switch
inserted correctly?
9
Are the CMU connectors inserted correctly?
Swap the Commander Switch with good
10 known vehicle. Does the Commander Switch
work correctly?
• Retrieve CMU log data if possible
before replacing the CMU.
Important Note
• Document date and time of the
condition.
• If possible, complete the Microsoft
Forms Questionnaire. Go to MGSS > Infotainment -> MAZDA
CONNECT Questionnaire.
• See Warranty Information Note.
○
Pass
Fail
Go to step 8.
Yes
Go to step 9.
No
Insert the connector correctly.
Yes
Go to step 10.
No
Insert the connectors correctly.
Yes
Check / Replace the Commander Switch.
No
Go to step 11.
Check / Replace the CMU.
Swap the CMU from known good vehicle.
Does the Commander Switch work correctly?
• Retrieve CMU log data if possible
before replacing the CMU.
Important Note
• Document date and time of the
condition.
• If possible, complete the Microsoft
Forms Questionnaire. Go to MGSS > Infotainment -> MAZDA
○
11 IMPORTANT NOTE: CMUs are VIN-locked.
When swapping a CMU from a known good
vehicle, always return it to the original vehicle
after troubleshooting is complete.
Yes
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06/16/2026 02:24 PM tlawrenc
CONNECT Questionnaire.
• See Warranty Information Note.
No
Repair/Replace wiring harness. Go to
MGSS View Content -> Wiring Diagram ->
Body and Accessories -> Entertainment
System.
No. 5 Bluetooth device will not pair
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
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TSB/Document ID: SA-039-26
Replacement Service Bulletin Number:
MFR Communication Date: 2026-06-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem: Mazda Connect
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