Mazda North American Operations
Irvine, CA 92618-2922

M-Tips
Subject:

ELECTRICAL CONCERN AND/OR MULTIPLE DTC'S DUE TO
AFTERMARKET DEVICE

M-Tips No.: MT-004/18

Last Issued: 09/14/2018

BULLETIN NOTES
This M-Tip supersedes the previously issued article(s) listed below: The changes are noted in Red.

Previous M-Tip(s):

Date(s) Issued:

MT-004/18

07/20/2018, 03/28/2018

MT-017/17

11/02/2017

MT-013/13

01/01/2013

APPLICABLE MODEL(S)/VINS

2011-2014 Mazda2 2007-2018 Mazda6 2007-2012 CX-7 2007-2011 RX-8
2007-2018 Mazda3 2016-2019 CX-3

2007-2019 CX-9

2007-2015 Mazda5 2013-2018 CX-5

2007-2019 MX-5

DESCRIPTION
If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...),
interview the customer before proceeding with normal Workshop Manual diagnosis. Aftermarket devices
may be the cause of the electrical concern. Ask the customer if any aftermarket devices have been
installed. Below are a couple of examples of unusual electrical concerns caused by aftermarket devices.

Page 1 of 4
An editorial board comprised of MNAO service staff members generates, collects, and verifies information for this publication.
To contribute repair tip ideas, send an e-mail to [email protected]. All contributions become property of MNAO, which assumes permission to publish them without further
consideration.

© 2018 Mazda North American Operations, U.S.A.

M-Tips No.: MT-004/18

Last Issued: 09/14/2018

Example 1
Some electrical devices connected to the DLC-2 connector by insurance or mobile phone companies may
cause:





Battery discharge. The device may disrupt the CAN system battery saver mode.
IDS/MMDS will not communicate with the vehicle due to poor DLC-2 connection. The aftermarket
device may cause DLC-2 female terminals to spread open.
DTCs
 B1041:54 - ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE
 C0061:54 - DSC HU/CM
 C1001:92 - FORWARD SENSING CAMERA (FSC)
 C1001:97 - FORWARD SENSING CAMERA (FSC)
 U0415:00 - MAZDA RADAR CRUISE CONTROL (MRCC)/SMART BRAKE SUPPORT
(SBS)
 U0420:00 - MAZDA RADAR CRUISE CONTROL (MRCC)/SMART BRAKE SUPPORT
(SBS)
 U300A:62 - ELECTRIC PARKING BRAKE (EPB)
 Multiple DTC's (U0xxx:00 Communication error)

If you determine that no aftermarket devices have been installed, continue with normal Workshop Manual
diagnosis.

Page 2 of 4
An editorial board comprised of MNAO service staff members generates, collects, and verifies information for this publication.
To contribute repair tip ideas, send an e-mail to [email protected]. All contributions become property of MNAO, which assumes permission to publish them without further
consideration.

© 2018 Mazda North American Operations, U.S.A.

M-Tips No.: MT-004/18

Last Issued: 09/14/2018

Key Warning Light
Aftermarket Cell Phone Charger
connected to 12V outlet

Engine Start/Stop Button
Amber Indicator Light Flashing

(red)

Example 3
Some aftermarket devices that are wired to the vehicles’s wiring harness may create unusual electrical
symptoms and/or store DTCs.
Below are examples of concerns due to an aftermarket GPS tracking device wired to the power window
main switch:





Engine no start
Battery discharge
Main relay buzzing

Page 3 of 4
An editorial board comprised of MNAO service staff members generates, collects, and verifies information for this publication.
To contribute repair tip ideas, send an e-mail to [email protected]. All contributions become property of MNAO, which assumes permission to publish them without further
consideration.

© 2018 Mazda North American Operations, U.S.A.

M-Tips No.: MT-004/18

Last Issued: 09/14/2018

Below is an example of a dim headlight. The aftermarket device changed the headlight circuit resistance,
causing a dim headlight.

Page 4 of 4
An editorial board comprised of MNAO service staff members generates, collects, and verifies information for this publication.
To contribute repair tip ideas, send an e-mail to [email protected]. All contributions become property of MNAO, which assumes permission to publish them without further
consideration.

© 2018 Mazda North American Operations, U.S.A.