# Service bulletin 07\-003\-20\-3712

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: 10177846
- Published by NHTSA: 2020\-08\-04
- Manufacturer's number: 07\-003\-20\-3712
- Manufacturer's date: 2020\-07\-16
- NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

Some customers may hear a repeating click sound when using the HVAC system. The click sound may be caused by the air mix doors moving back and forth. This concern has been eliminated by a dash\-electrical supply unit control software modification.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10177846-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10177846-9999.pdf)

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

## Components

Electrical system, Equipment and accessories, Software

## Vehicles listed

- 2020 MAZDA CX\-30
- 2019 to 2020 MAZDA MAZDA3

## Other bulletins for the same vehicles and component

- [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.
- [SA\-003\-20f](/bulletins/10185180.md), 2021-01-06, Service bulletin: ENGINE AND ENGINE COOLING; EQUIPMENT ADAPTIVE/MOBILITY; STRUCTURE; ELECTRICAL SYSTEM:SOFTWARE. IMPORTANT NOTE: Some 2020 Mazda3 vehicles may have incorrect infotainment software version 10042 installed. The incorrect software will cause MyMazda App Connected Vehicle enrollment errors. Go to SSPC1. Some customers may complain about any of the following: Infotainment Center Display does not provide the Authorization Code during the MyMazda App Connected Vehicle enrollment \(and Software Update Error message on 2020 Mazda3 only\). Remote function\(s\) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
- [SA\-031\-20j](/bulletins/10183664.md), 2020-12-04, Service bulletin: LATCHES/LOCKS/LINKAGES:DOORS:LOCK; EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE. IMPORTANT NOTE: Some 2020 Mazda3 vehicles may have incorrect infotainment software version 10042 installed. The incorrect software will cause MyMazda App Connected Vehicle enrollment errors. Go to SSPC1. Some customers may complain about any of the following: Infotainment Center Display does not provide the Authorization Code during the MyMazda App Connected Vehicle enrollment \(and Software Update Error message on 2020 Mazda3 only\). Remote function\(s\) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
- [SA\-031\-20i](/bulletins/10183663.md), 2020-12-04, Service bulletin: ENGINE AND ENGINE COOLING; EXTERIOR LIGHTING; ELECTRICAL SYSTEM:SOFTWARE. IMPORTANT NOTE: Some 2020 Mazda3 vehicles may have incorrect infotainment software version 10042 installed. The incorrect software will cause MyMazda App Connected Vehicle enrollment errors. Go to SSPC1. Some customers may complain about any of the following: Infotainment Center Display does not provide the Authorization Code during the MyMazda App Connected Vehicle enrollment \(and Software Update Error message on 2020 Mazda3 only\). Remote function\(s\) inoperative. Engine Start / Stop, Door Lock / Unlock, Lights ON / OFF
- [09\-013\-20\-3663c](/bulletins/10183595.md), 2020-12-03, Service bulletin: ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE. When the Telematics Communication Unit \(TCU\) has been replaced or reprogrammed and the software is updated to ones shown below, DTC U2050:55\-TCU \(Activation of remote control not implemented\) may be stored in memory with the message “In\-Vehicle Network Malfunction” displayed in the multi\-information display. This is caused by a communication error between the TCU, the Connectivity Master Unit \(CMU\), and the Body Control Module \(BCM\) when the control software in them are not of the version being ready for activation of connected service. To correct this concern, the control software of the TCU, CMU and BCM have been modified.
- [09\-013\-20\-3663b](/bulletins/10182102.md), 2020-11-04, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM. When the Telematics Communication Unit \(TCU\) has been replaced or reprogrammed and the software is updated to ones shown below, DTC U2050:55\-TCU \(Activation of remote control not implemented\) may be stored in memory with the message “In\-Vehicle Network Malfunction” displayed in the multi\-information display. • Japan built vehicles: BDGF\-67CK2\-B or later suffix. • Mexico built vehicles: BDTS\-67CK2\-A or later suffix. NOTE: The Description for DTC U2050:55\-TCU will be added to MGSS. This is caused by a communication error between the TCU, the Connectivity Master Unit \(CMU\), and the Body Control Module \(BCM\) when the control software in them are not of the version being ready for activation of connected service. To correct this concern, the control software of the TCU, CMU and BCM have been modified. When you encounter this concern, reprogram \(update\) the BCM and the CMU to the latest version.
- [07\-005\-20\-3745](/bulletins/10182098.md), 2020-11-03, Service bulletin: ENGINE AND ENGINE COOLING; EQUIPMENT:APPLIANCE:AIR CONDITIONER; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT ADAPTIVE/MOBILITY. Some customers may complain that the A/C blows warm air while idling after restarting a warm engine. This is caused by improper control software of the PCM not allowing the active air shutter to open properly, resulting in lower cooling performance at idle. To eliminate this concern, the control software of the PCM has been modified.
- [16\-001\-20\-3683c](/bulletins/10182097.md), 2020-11-03, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE. AUDIO, NAVIGATION AND PHONE CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM \(7TH GENERATION MODELS\). Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update \(Version 7000C0A\-NA01\_11012 or later\). NOTE: Device compatibility can be found at connect.mazda.com \- Support \- Compatibility.
- [16\-001\-20\-3683b](/bulletins/10182096.md), 2020-11-03, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE; ELECTRICAL SYSTEM:SOFTWARE. AUDIO, NAVIGATION AND PHONE CONCERNS WITH MAZDA CONNECT INFOTAINMENT SYSTEM \(7TH GENERATION MODELS\). Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update \(Version 7000C0A\-NA01\_11012 or later\). NOTE: Device compatibility can be found at connect.mazda.com \- Support \- Compatibility. 16\-001\-20\-3683c

JSON: [/v1/bulletins/10177846](/v1/bulletins/10177846)

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