Mazda North American Operations
Irvine, CA 92618-2922

Subject:
DRW26 - 2020 MAZDA3 MAZDA CONNECT CONCERN

.:
Last Issued: 10/1/2019

DESCRIPTION
Outline of concern
On certain subject vehicles, it is possible the following concerns may happen when the connectivity service
is available.

1. The hands-free capability does not work properly due to a communication error between CMU
(Connectivity master unit) and the microphone.

2. The communication failure happens between the TCU (Telematics Communication Unit) and
connectivity server due to improper software of the TCU.

3. Door lock operation will work even though the key fob is inside of the vehicle.
Outline of repair
Reprogram TCU and C-BCM with modified software, using a specific MDRT3 tool.

Page 1 of 1
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2019 Mazda North American Operations, U.S.A.

October 1, 2019
Attention: Mazda Dealership Sales and Service Managers
Subject:

Dealer Rework (DRW) 26 - Mazda Connect Concern 2020 Mazda3

We are writing to inform you that certain 2020MY Mazda3 vehicles, may be
affected by the concern mentioned below. Vehicles affected by this DRW
will be visible in eMDCS on October 1, 2019. The VIN list of affected
vehicles for DRW26 will be uploaded to MGSS along with Repair Procedures
and Warranty Information by October 2, 2019. Affected vehicles are
expected to arrive at your dealership starting October 2, 2019.
Subject Vehicles:
Model
2020 Mazda3
(built at MC)
2020 Mazda3
(built at (MMVO)

Subject VIN range
JM1BP****L1147656 – 51143
3MZBP****LM115095 – 19671

Subject
production
date range
From June 29, 2019
through August 21, 2019
From June 28, 2019
through August 14, 2019

Number of subject vehicles:
Country
USA

Subject
vehicles
2,580

Action Required:
Please hold the affected vehicles in inventory until the repair procedure has
been performed. This DRW must be performed before the vehicle is sold and is
a requirement for a New Car Ready Claim.
A specific Mazda Diagnostic Repair Tool (MDRT) is needed for this repair (see
photo below). Beginning September 30, 2019 the Mazda Warranty Department is
shipping one tool free of charge to each Mazda dealer via UPS Overnight
Delivery.
Please only use this specific MDRT tool for DRW26 as all other
tools will not repair this concern. We will request this tool be returned at
a later date after all vehicles have been repaired.

Concern Outline:
On certain subject vehicles, it is possible the following may happen,
when the connectivity service will be available.
1. The hands-free capability does not work properly due to a
communication error between CMU (Connectivity master unit) and the
microphone.
2. A communication failure happens between TCU (Telematics
Communication Unit) and connectivity server due to improper
software of TCU.
3. Doors can be locked even though the fob key is inside the vehicle.
Outline of Repair:
Reprogram the TCU and BCM with modified software, using MDRT.
We apologize for any inconvenience this program may cause your dealership
and your customers. Your understanding and support are greatly
appreciated.
If you have any questions regarding this DRW, please contact Dealer Recall
Help on MXConnect > Warranty or contact the Mazda Warranty Department at
[email protected]
Sincerely,
Travis Young
Manager, Recalls, Technical Services Division
Mazda North American Operations

REPAIR PROCEDURE
DRW26
Mazda3 TCU & BCM reprograming by MDRT for DRW26
NOTE: Before reprogramming, please connect a Battery charger to prevent a drop in battery
voltage.

MDRT Tool
- MDRT

MDRT

1. Check if any warning lamps are on or flashing in the instrument cluster, and repair it according to the
Workshop Manual before reprogramming.
2. Reprogram the TCU & BCM with Mazda Diagnostic Reprogramming Tool (MDRT).

B

A
B
C
D

C

OBDII connector
Display
LED light (Red)
LED light (Green or Blue)

D
A

LED lights show the configuration
status.
*There are two LED types for MDRT.
1. Green & Red (Serial number up to 02217)
2. Blue & Red (Serial number after 02218)

Handling Caution
Take care when handling the MDRT tool to avoid damage
 Avoid exposing it to high heat.
 Avoid exposing it to water.
To avoid module damage during reprogramming.
- Do not disconnect MDRT from OBDII connector.
- Do not start engine.
- Do not turn IG-Off.
Otherwise a module replacement may be required.

NOTE
When performing reprogramming with an MDRT:
- Verify that the room fuse is installed.
- Turn off all electric-type loads such as air-conditioning or the audio system and then connect battery

Page 1 of 4

REPAIR PROCEDURE
DRW26
charger.
- Do NOT touch the MDRT while Green or Blue light is blinking or when you hear a “beep” sound.
- During the reprogramming operation, the center display and instrument cluster may blink, which is
NORMAL.
TCU & BCM reprogramming procedure
#1. Turn the ignition off.
#2. Connect the MDRT to the OBDII connector.
Note: Wait until the green/blue and the red LED turn on with a long beep, then go to the next step.
#3. Switch the ignition to on (Engine not running)
#4. Wait and Monitor the MDRT display.
Note:
- The reprogramming needs approximately 15 minutes. (Pulsing beeps will sound during the reprogramming）
- When the reprogramming has successfully completed, the display shows “Repro OK” and in the bottom
row of the tool, green or blue LED lights will be blinking.
Caution: BCM - If the reprogramming fails, restart the procedure from Step 1.

#5. Turn the ignition off.
#6. Disconnect the MDRT.

①
②

Please refer to the chart
Displayed message after
reprogramming’ below.
Note: It may display either or ① to ③.
Displayed message after reprogramming of TCU
Software type
Suffix
BDGF
B
BDTS
A

Displayed message after reprogramming of BCM
Software type
Suffix
BDTS
M
①
BEMD
M
②
BCKA
R
③

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REPAIR PROCEDURE
DRW26

How to verify the reprograming results by display
Confirm that the display shows a message as follows after completing reprogramming.
Suffix

Software type

Lower message on the display indicates each of the software type & suffix.

If a suffix becomes higher, Reprogramming is completed.

Troubleshooting
The number is related to the step number in the reprogramming procedure.
Text in bold mean the most possible cause.
No.

Technician's
operation

Vehicle status

MDRT status

3-1

IG-ON

IG-ON

MDRT
malfunction.

3-2

IG-ON with
MDRT not
securely
connected

IG-ON

No power
supplied.

IG-ON

Not a subject
vehicle

MDRT can't
identify vehicle.
MDRT performs
only deleting
DTC.

4-2

IG-ON

IG-ON
Batt. Voltage:
11 V or lower
SOC: 75 % or
lower

Check battery
voltage.
Stop
reprograming.

4-3

Poor MDRT
connection
during
reprograming

IG-ON

No power
supplied.

4-4

Monitoring
MDRT

IG-ON

Finish
reprograming
DTCs have been
detected

IG-ON

IG-ON
Reprograming
failed

Verify
reprograming
result.

4-1

4-5

LED status
G or B
R
G or B

Off
Illuminate
Off

R

Off

G or B

Off

R

Blinking at
intervals of
1 sec

G or B

Off

R

Blinking at
intervals of
1 sec

G or B

Off

R

Off

G or B

Display

Continuously
beeping

Data Fail

No beep
VIN_NG
Continuously
beeping

G or B
R

Illuminate

No Target
Repro NG

Continuously
beeping

BATCHK

No beep

Illuminate
Blinking at
intervals of
1 sec
Off

R

Beep sound

Rep Succ
Pulsing beeps

Continuously
beeping

DTC!!
Repro NG
XXXXX

Page 3 of 4

REPAIR PROCEDURE
DRW26
NOTE
In case of "No. 4-1", verify the vehicle is subject to the DRW.
In case of "No. 3-1", it may be caused by one of the following concerns:
- Data in the Module is broken. The possible causes are followings.
1. MDRT has been disconnected from OBDII connector during reprograming.
2. Engine has been started or IG is turned off during reprograming.

Page 4 of 4

WARRANTY INFORMATION
DRW26
CONDITION OF CONCERN
On certain subject vehicles, it is possible the following may happen, when the
connectivity service will be available.
1. The hands-free capability does not work properly due to a communication error
between CMU (Connectivity master unit) and the microphone.
2. A communication failure happens between TCU (Telematics Communication Unit) and
connectivity server due to improper software of TCU.
3. Doors can be locked even though the fob key is inside the vehicle.
OUTLINE OF REPAIR
Reprogram the TCU and C-BCM with modified software, using MDRT.
repair this concern will begin shipping out September 30, 2019.

Tools to

SUBJECT VEHICLES
Please use eMDCS Warranty Vehicle Inquiry to verify if the vehicle has
DRW26.
Model
2020 Mazda3
(built at MC)
2020 Mazda3
(built at
MMVO)

Subject VIN range
JM1 BP**** L1 147656 – 151143
3MZ BP**** LM 115095 – 119671

Subject production date range
From 29 June 2019 through
21 August 2019
From 28 June 2019 through
14 August 2019

1. Verify the vehicle is within the range above:
Model
2020 Mazda3
(built at MC)
2020 Mazda3
(built at
MMVO)

Subject VIN range
JM1 BP**** L1 147656 – 151143
3MZ BP**** LM 115095 – 119671

Subject production date range
From 29 June 2019 through
21 August 2019
From 28 June 2019 through
14 August 2019

Note: The asterisk symbol “*” can be any letter or number.
* Not all vehicles within this VIN range are included in DRW26.
Perform a Warranty Vehicle Inquiry in eMDCS to verify DRW26 is
open.
•
•

If the vehicle is within the above ranges, proceed to step 2.
If the vehicle is not within the above ranges, DRW26 is not
applicable.

Page 1 of 2

WARRANTY INFORMATION
DRW26
2. Perform a Warranty Vehicle Inquiry using eMDCS

If eMDCS displays:

Action to perform:

DRW26 OPEN

Inspect the vehicle and determine
what repair is required.

DRW26 CLOSED

Return vehicle to inventory.

DRW26 is not displayed

DRW26 does not apply to this
vehicle. Return vehicle to
inventory.

Warranty Information
DEALER REWORK (DRW26)
Dealer Rework – MDRT Update
Process Number
Symptom Code
Damage Code
Part Number Main
Cause
Quantity
Labor Operation
Number
Labor Hours

AK051A
99
99
7777-SP-R63
0
XXR9XXFX
0.2 H

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