NHTSA ID Number: 10190968
Manufacturer Communication Number: SA-027-21
TSB/Document Date: 2021-04-26
Summary
MAZDA
CONNECT Symptom Troubleshooting (7th Generation Vehicles). Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure
BULLETIN NOTES
This service alert supersedes the previously issued service alert listed below. The changes are noted in Red text.
Previous Service Alert:
Date(s) Issued:
SA-027/20
10/16/20, 09/22/20, 09/11/20, 07/16/20, 06/23/20, 04/08/2
0, 03/19/2020 and 02/11/20
SA-042/19
12/12/19 and 09/25/19
APPLICABLE MODEL(S)/VINS
2019-2021 Mazda3
2020-2021 CX-30
2021 CX-5
2021 CX-9
DESCRIPTION
Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
NOTE: Before proceeding:
• Document the vehicle current MAZDA CONNECT CMU software version.
• Confirm that the Connectivity Master Unit (CMU) is updated to the latest software version.
Go to MGSS -> Infotainment -> MAZDA CONNECT Updates
Go to TSB 16-001/20 to view MAZDA CONNECT CMU software fix list.
• Confirm that the customers device is compatible. Go to connect.mazda.com -> Support -> Compatibility.
• Confirm that the customers device is updated to the latest software version.
• If CMU log data collection is necessary, collect the data and continue troubleshooting using this document. If no
failure is found, release the vehicle to the customer and inform them that the infotainment system data is being
analyzed. Hotline will contact you at a later date with the results.
• Apple Carplay/Android Auto FAQ, go to SA-001/19.
○
○
Index:
Page 1 of 13
04/14/2021 01:50 PM tlawrenc
No. 1 Blank Screen
No. 2. Rear View Camera is not displayed
No. 3 Rebooting
No. 4 Infotainment System Has No Sound
No. 5 Commander Switch Does Not Work
No. 6 Bluetooth device will not pair
No. 7 Incorrect GPS position
No. 8 Voice Recognition Does Not Work
No. 9 Cannot Make a Hands-Free Call
No. 10 Cannot Play Bluetooth Audio
No. 11 How to Check Navi SD Card VIN Lock
No. 1 Blank Screen
Step
1
Inspection
Is the Rear View Camera displayed?
Result
Action
Yes
Go to step 2.
No
Refer to No. 2. Rear View Camera is not displayed
Normal Operation
2
Press and hold the Power Button. Is the
screen displayed correctly?
Yes
No
Go to step 3.
3
Press the "HOME" button. Is the HOME
screen displayed correctly?
Yes
Normal Operation
No
Go to step 4.
4
Using M-MDS, are any infotainment
system DTC's stored?
Yes
Go to MGSS for DTC diagnosis
No
Go to step 5.
5
Is there a device connected to the USB
port?
Yes
Go to step 6.
No
Go to step 7.
Disconnect the USB device. Does the
display function properly after USB
device is disconnected?
Yes
USB device is not compatible
6
No
Go to step 7.
7
Is the connector for the Center Display
inserted correctly
Yes
Go to step 8.
No
Insert the connector correctly.
8
Are the connectors for the CMU
inserted correctly?
Yes
Go to step 9.
No
Insert the connectors correctly.
Is the CMU voltage out (PWR CTRL
OUT) at 0920-101A Terminal 1S, SB
wire, of the CMU normal?
Yes
Go to step 10.
9
No
Go to step 11.
Swap the Center Display with good
known vehicle. Is the screen display
normal?
Yes
Check / Replace the Center Display.
10
No
Go to step 11.
11
Swap the CMU with good known
vehicle. Is the screen display normal?
Yes
Check / Replace the CMU.
Page 2 of 13
04/14/2021 01:50 PM tlawrenc
• Retrieve the data log if possible before
replacing the CMU
• Document date and time of the condition
No
Repair / Replace wiring harness. Go to MGSS
View Content -> Wiring Diagram -> Body and
Accessories -> Entertainment System.
No. 2 Rear View Camera is not displayed
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 the vehicle equipped with 360
View Monitor?
Yes
Go to step 3.
No
Go to step 4.
3
Is the Front Camera and Side
Cameras displayed normally?
Yes
Check / Replace the 360 View Monitor control unit.
No
Go to step 4.
4
Are images other than the Rear
View Camera displayed?
Yes
Go to step 5.
No
Go to No. 1 Blank Screen.
5
Is the connector for the Rear View
Camera Inserted correctly?
Yes
Go to step 6.
No
Insert the connector correctly.
6
Is the connector for the Center
Display Inserted correctly
Yes
Go to step 7.
No
Insert the connector correctly
7
Are the connectors for the CMU
Inserted correctly
Yes
Go to step 8.
No
Insert the connectors correctly
8
Swap the Rear View Camera with
good known vehicle. Is the screen
display normal?
Yes
Check / Replace the Rear View Camera
See TSB 09-021/19
No
Go to Step 9
Check / Replace the CMU.
9
Swap the CMU with good known
vehicle. Is the screen display
normal?
Yes
No
• Retrieve the data log if possible before
replacing the CMU
• Document date and time of the condition
Repair / Replace wiring harness. Go to MGSS View
Content -> Wiring Diagram -> Body and Accessories > Entertainment System.
No. 3 Rebooting
Step
Inspection
Result
Action
Page 3 of 13
04/14/2021 01:50 PM tlawrenc
1
Is the customers device a Doro 7050, 7060 phone
Yes
that is connected by bluetooth?
Update CMU software version to
7000C0A-NA01_11006 or later.
No
Go to next step
Yes
Go to MGSS for DTC diagnosis
No
Go to step 3.
Yes
Go to step 4.
No
Check / Replace the Navigation SD
card.
Go to SA-014/21 if applicable
Yes
Go to step 5.
No
Go to step 6.
2
Using M-MDS, are any infotainment system
DTC's stored?
3
Does the reboot continue after removing the
Navigation SD card?
4
Is there a device connected to the USB port?
5
Disconnect the USB device. Does the reboot stop Yes
after USB device is disconnected?
No
Yes
USB device is not compatible
Go to step 6.
Go to step 7.
Check / Replace the CMU.
6
Does the reboot continue after ignition key OFF
then back ON?
No
• Retrieve the data log if possible
before replacing the CMU
• Document date and time of the
condition
Check / Replace the CMU.
7
Does the reboot continue after vehicle battery
disconnect?
Yes
No
• Retrieve the data log if possible
before replacing the CMU
• 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 DTC's stored?
Yes
Go to MGSS for DTC diagnosis
No
Go to step 2.
2
Is sound normal other than navigation
Yes
Go to step 3.
Page 4 of 13
04/14/2021 01:50 PM tlawrenc
guidance?
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
mode?
No
Yes
5
Replace the Navigation SD Card. Can you
hear voice after Navigation SD Card
No
replacement?
6
Can you hear sound after raising the
volume of audio?
7
>
Are there any problems with the media and
the music files?
Yes
>
Are there any problems with the antenna
and the reception?
>
Are there any problems with Bluetooth?
No
8
Normal Operation.
Go to step 6.
Complete
Check / Replace the CMU. Retrieve
• Retrieve the data log if possible before
- 💯【Conta.ct us for Support Directly】If you met any...
- 🔥🔥🔥【2026 AUTEL FLAGSHIP MK900BT MK900-BT, NEW...
- 🚗【3000+ ACTIVE TESTS (50➡3000+), SAME AS MS...
- 🚗【40+ HOT SERVICES FOR 150 MAKES (28+➡40+)】Full...
- 🚗【OE ALL SYSTEM DIAGNOSE, AUTO SCAN 2.0: SCAN LICENSE...
- 【TURN OFF CEL】 This AL319 car scanner diagnostic tool...
- 【EXTENSIVE APPLICATION】 Autel AL319 Compatible with...
- 【FOR END USER & DIYERS】 This error code reader AL319 is...
- 【USER-FRIENDLY DESIGN】 This OBD2 scanner and check...
- 【HIGH-QUALITY SERVICES】 12 months war.ranty from the...
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: SA-027-21
Replacement Service Bulletin Number:
MFR Communication Date: 2021-04-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS
, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU c0ding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations
- 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Pr0gramming): Allows for Ford, for Lincoln, and for Mazda ECU pr0gramming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- 39+ Services/Resets/Adaptations/Relearns/Calibrations: XTOOL D7S full system car scanner diagnostic tool tackles 99% of common car issues through its 36+ special functions, including Oil Reset, EPB, SAS, BMS, Throttle Reset, Injector C0ding, ABS Bleed, TPMS Reset, Power Balance, etc and also covers specific-vehicle functions like Crank Sensor Relearn, ABS Initialization, Cylinder Power Balance, Fuel Trim Reset, Idle Relearn etc. This car diagnostic scanner enhances efficiency, making repairs and maintenance hassle-free. Tip: DO NOT for All vehicles, please check compatibility first
- Cost-effective ECU C0ding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.