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.
Is Bluetooth enabled on the
customers device?
Yes
Go to step 3.
No
Enable Bluetooth on the customers device.
3
Is the customers device paired to
the vehicle?
Yes
Go to step 4.
No
Pair the customers device to the vehicle.
4
Is the customers device selected in
MAZDA CONNECT settings?
Yes
Go to step 5.
No
Select the customers device from Bluetooth settings.
Delete the device from MAZDA
CONNECT and then re-pair it.
Does Bluetooth work correctly?
Yes
Normal Operation.
5
No
Go to step 6.
Yes
Go to step 7.
6
Go to connect.mazda.com ->
Support -> Compatibility.
Is the customers device
compatible?
No
The customers device is not compatible.
Yes
Go to step 8.
Check / Replace the CMU.
7
Does the same symptom occur on
another same model/year vehicle?
○
No
Yes
8
Reboot the customers device.
Does Bluetooth 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.
Vehicle operation is normal.
Check / Replace the CMU.
No
• Retrieve CMU log data if possible before
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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. 6 Incorrect GPS position
Step
1
Inspection
Result
Go to MAZDA CONNECT -> Navi menu, Travel
Information -> Where Am I? -> Settings -> GPS
information -> Check Available Satellites.
or
Go to MGSS "DIAGNOSTIC ASSIST FUNCTION
[CONNECTIVITY MASTER UNIT (US)]" and
perform Functional Inspection/Adjustment -> Navi
System Inspection -> Check GPS Received Level.
Yes
Normal Operation.
Action
No
Go to step 2.
Yes
Go to step 4.
No
Go to step 3.
Yes
Go to step 9.
No
Swap wheels/tires with correct size. If
issue is fixed, inform the customer.
Yes
Go to step 5.
No
Insert the connector correctly.
Yes
Repair / Replace GPS wiring
harness.
No
Go to TSB 09-021/20.
Yes
Repair Complete.
No
Go to step 7.
Yes
Go to step 8.
No
Insert the connectors correctly.
Yes
Repair / Replace CMU wiring
harness.
Does the Navi system show correct vehicle position?
2
Using M-MDS, are any of the following DTC's
stored?
- B119F:13, GPS antenna signal circuit malfunction
(short to power or open circuit)
- B119F:2B, GPS antenna signal circuit malfunction
(short to ground)
3
Is the wheel and tire size correct according to the tire
label?
4
Is the GPS antenna connector secured properly?
5
Is the GPS wiring harness open or shorted?
6
Did TSB 09-021/20 resolve the concern?
7
Are the CMU connectors secured properly?
8
Is the CMU wiring harness open or shorted?
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No
Go to step 9.
Yes
Repair completed.
Check / Replace the CMU.
9
Replace GPS antenna. Does the Navigation system
show correct position?
No
• Document date and time of the
condition.
• Retrieve CMU log data if
possible before replacing the
CMU.
Important Note
• Retrieve CMU backup data if
possible before replacing the
CMU.
○
10
Using M-MDS, is DTC B119F:49 stored?
(Communication error with GNSS)
11 Are the CMU connectors secured properly?
Yes
Go to step 11.
No
Go to step 13.
Yes
Go to step 12.
No
Insert the connectors correctly.
Yes
Repair / Replace CMU wiring
harness.
Check / Replace the CMU.
12 Is the CMU wiring harness open or shorted?
No
Check / Replace the CMU.
13
• Document date and time of the condition.
• Retrieve CMU log data if possible before
replacing the CMU.
• Retrieve CMU backup data if possible before
replacing the CMU.
• Document date and time of the
condition.
• Retrieve CMU log data if
possible before replacing the
CMU.
Important Note
• Retrieve CMU backup data if
possible before replacing the
CMU.
• If necessary, contact Hotline
for additional support.
• See Warranty Information
Note.
○
Yes
Repair completed.
No
Repair / Replace GPS antenna.
Did DTC B119F:49 clear?
NOTE: Remove aftermarket GPS devices that may interfere with vehicle GPS antenna.
Example: Some radar detectors may emit radio waves that interfere with the vehicle GPS antenna.
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06/16/2026 02:24 PM tlawrenc
No. 7 Voice Recognition Does Not Work
Step
Inspection
Result
1
Using M-MDS, are any infotainment system DTC's
stored?
Yes
Go to MGSS for DTC diagnosis.
No
Go to step 2.
Pass Go to step 3.
2
Go to MGSS "DIAGNOSTIC ASSIST FUNCTION
[CONNECTIVITY MASTER UNIT (US)]" and
perform Functional Inspection/Adjustment ->
Steering SW Inspection -> Did the Steering SW
Inspection Pass?
Fail
Action
Go to MGSS STEERING SWITCH
INSPECTION.
Check / Replace the CMU.
3
Go to MGSS "DIAGNOSTIC ASSIST FUNCTION
[CONNECTIVITY MASTER UNIT (US)]" and
perform Functional Inspection/Adjustment ->
Microphone Inspection ->
Did the Microphone Inspection Pass?
• Document date and time of the
condition.
• Retrieve CMU log data if possible
before replacing the CMU.
Important Note
• Retrieve CMU backup data if
possible before replacing the
CMU.
• If necessary, contact Hotline for
additional support.
• See Warranty Information Note.
○
Pass
Fail
Go to MGSS MICROPHONE
INSPECTION.
No. 8 Cannot Make a Hands-Free Call
Step
Inspection
Result
Action
Using M-MDS, are any
infotainment system DTC's
stored?
Yes
Go to MGSS for DTC diagnosis.
1
No
Go to step 2.
2
Is Bluetooth enabled on the
customers device?
Yes
Go to step 3.
No
Enable Bluetooth on the customers device.
Is the customers device data
service strength good?
Yes
Go to step 4.
3
No
Move to a location where data service strength is good
and retest.
4
Is the customers device paired to
the vehicle?
Yes
Go to step 5.
No
Pair the customers device to the vehicle.
5
Is the customers device selected
in MAZDA CONNECT settings?
Yes
Go to step 6.
No
Select the customers device from Bluetooth settings.
6
Delete the device from MAZDA
Yes
Normal Operation.
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06/16/2026 02:24 PM tlawrenc
CONNECT and then re-pair it.
Does Bluetooth work correctly?
No
Go to step 7.
Yes
Go to step 8.
7
Go to connect.mazda.com ->
Support -> Compatibility.
Is the customers device
compatible?
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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
Previous TSB | Next TSB |
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