# Service bulletin SA\-066\-20

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10180717
- Published by NHTSA: 2020\-10\-05
- Manufacturer's number: SA\-066\-20
- Manufacturer's date: 2020\-09\-14
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT; ELECTRICAL SYSTEM:12V/24V/48V BATTERY

## NHTSA's summary

When performing vehicle services such as control unit software update, control unit registration/activation, CMU log data retrieval, etc., always do the following: • Use the GR8 battery charger SST to maintain battery voltage. See SA\-063/20. • Use M\-MDS hardware that is in good working condition. CAUTION: If the GR8 is not used or if the M\-MDS hardware is not in good working condition, a control unit failure may occur.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10180717-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10180717-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Equipment and accessories, 12\-volt battery, Software

## Vehicles listed

- 2020 to 2021 MAZDA CX\-30
- 2021 MAZDA CX\-5
- 2021 MAZDA CX\-9
- 2019 to 2021 MAZDA MAZDA3

## Other bulletins for the same vehicles and component

- [01\-007\-23](/bulletins/10237197.md), 2023-06-04, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM. The Mazda DCA\-8000 is required for all warranty battery testing. If the Mazda DCA\-8000 is not used, incorrect battery testing may result in unnecessary battery replacement. Use the following test procedures in this Service Bulletin to test Mazda vehicle batteries and to generate a Warranty Code.
- [SA\-004\-22b](/bulletins/10213125.md), 2022-06-04, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM. Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure.
- [SA\-003\-22d](/bulletins/10209751.md), 2022-04-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Mazda3 and CX\-30: Prior to February 8, 2022, some vehicles may store DTC U0300:57 \(Body control module \(BCM\) internal malfunction\) and cannot be erased after a BCM replacement or MDARS BCM software update \(NOT with BCM update for SSPC5 or 4621B using MDRT\). This is caused by a BCM\-VCM software error. MX\-30: Some MX\-30 vehicles may store DTC U0300:57 \(Body control module \(BCM\) internal malfunction\) and cannot be erased after a BCM replacement or MDARS BCM software update. This is caused by a BCM\-VCM software error. Mazda is aware of the issue and is working on a resolution. If there is an issue with this concern, Mazda recommends putting customer in a loaner vehicle at this time. \*DO NOT perform BCM software update with MDARS until further notice. \*This SA will be updated with the newest repair information as it becomes available.
- [09\-021\-21\-3818b](/bulletins/10201772.md), 2021-10-02, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. All Mazda Connect vehicles in new car inventory must be updated to the software version listed below in this TSB as part of the New Car Ready Step 3 process. Make sure the new vehicle specialist receives a copy of this bulletin. Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update \(Version 74.00.230 or later\). NOTE: For 2016 CX\-9 with version earlier than 59.00.441, the tachometer function will be removed from the Active Driving Display as part of Mazda’s continuing efforts to improve safety and reduce driver distraction. Please explain this to the customer before updating the software. If the customer agrees, turn off the tachometer display on the AD\-Display tab in MAZDA CONNECT Settings before performing the update. NOTE: If the customer has customized MAZDA CONNECT with something like a different background using unauthorized software, make sure they know the following information before updating MAZDA CONNECT to avoid any issues later on. Updating MAZDA CONNECT to the latest version will erase any customization created by unauthorized software. Unauthorized customization software will not work on the latest version of MAZDA CONNECT software. The latest version of MAZDA CONNECT software cannot be rolled back to an earlier version. Mazda does not recommend unauthorized customization of MAZDA CONNECT due to the possibility of unexpected problems. Any issues related to this will not be covered under Mazda warranty policy.
- [DRW41a](/bulletins/10200947.md), 2021-09-03, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT:ELECTRICAL; COMMUNICATION:MANUFACTURER TELEMATICS. DRW41 \- TELEMATICS COMMUNICATION UNIT \(TCU\) CONCERN \- BATTERY DRAIN AND CONNECTED SERVICES. On certain subject 2021 MY CX\-5 \& CX\-9 vehicles, a battery drain concern could occur due to the Telematics Communication Unit \(TCU\) not going to sleep. In addition, some vehicles were repaired under the cancelled campaign SSPC6, which caused Connected Services to no longer work. This Dealer Rework will repair all concerns to ensure the battery drain concern does not occur and restores Connected Services, if disabled from a prior software update. All Mazda dealers will update the subject vehicles with improved TCU software. This campaign will be expanded to include additional Mazda3 and CX\-30 vehicles at a later date, please watch for additional announcements.
- [SSPC7](/bulletins/10200942.md), 2021-09-03, Service bulletin: ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; COMMUNICATION:MANUFACTURER TELEMATICS. SSPC7 \- SPECIAL SERVICE PROGRAM \-TELEMATICS COMMUNICATION UNIT BATTERY DRAIN CONCERN AND CONNECTED SERVICES NOT AVAILABLE
- [SA\-045\-21d](/bulletins/10200938.md), 2021-09-03, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; EQUIPMENT:ELECTRICAL; ENGINE. Connected vehicle remote functions inoperative and/or engine no start due to low battery voltage. NOTE: SA\-045/21 HAS BEEN SUPERCEDED TO SSPC7.
- [SA\-045\-21c](/bulletins/10200937.md), 2021-09-03, Service bulletin: EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE. Connected vehicle remote functions inoperative and/or engine no start due to low battery voltage. Some customers may experience the following symptoms: Connected Vehicle Remote Functions inoperative after SSPC6 repair. Connected Vehicle Remote Functions inoperative on vehicles built March 20, 2021 and later.
- [SA\-045\-21b](/bulletins/10200935.md), 2021-09-03, Service bulletin: EQUIPMENT:ELECTRICAL; ENGINE; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Connected vehicle remote functions inoperative and/or engine no start due to low battery voltage. Some customers may experience the following symptoms: Connected Vehicle Remote Functions inoperative after SSPC6 repair. Connected Vehicle Remote Functions inoperative on vehicles built July 1, 2021 and later.
- [SA\-045\-21a](/bulletins/10200934.md), 2021-09-03, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE; EQUIPMENT:ELECTRICAL. Connected vehicle remote functions inoperative and/or engine no start due to low battery voltage. Some customers may experience the following symptoms: Connected Vehicle Remote Functions inoperative after SSPC6 repair. Connected Vehicle Remote Functions inoperative on vehicles built July 1, 2021 and later.

JSON: [/v1/bulletins/10180717](/v1/bulletins/10180717)

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