SA-029-20

Service Alert
Mazda North American Operations
Irvine, CA 92618-2922
Subject:
"IN-VEHICLE NETWORK MALFUNCTION" INSTRUMENT CLUSTER
WARNING MESSAGE
Service Alert No.: SA-029/20
Last Issued: 02/25/2020
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-014/19
09/05/19 and
04/03/19
APPLICABLE MODEL(S)/VINS
2019-2020 Mazda3
2020 CX-30
DESCRIPTION
Some customers may experience a "IN-VEHICLE NETWORK MALFUNCTION" warning message in the
instrument cluster with one or more of the following DTC's stored:







B119F:01 TCU - Tel antenna No. 1 malfunction
B1252:87 TCU - Communication error with connectivity master unit (CMU)
U0156:00 VCM - Communication error with connectivity master unit (CMU)
U0156:00 BCM - Communication error with connectivity master unit (CMU)
U0198:00 BCM - Communication error with emergency call unit
U212D:00 BCM - Communication error with light control module (RH)
U3000:00 TCU - Telematics communication unit internal malfunction
Page 1 of 5
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.
© 2020 Mazda North American Operations, U.S.A.
02/26/2020 10:36 AM tlawrenc
Service Alert No.: SA-029/20
Last Issued: 02/25/2020
Instrument Cluster
Infotainment Center Display
REPAIR PROCEDURE
1. Verify customer concern.
2. Connect MDARS.
NOTE: Only use MDARS to scan for DTC's. If IDS is used, P0602 (PCM programming error) will falsely set.
Is the TCU shown (red or green) on the MDARS main screen?


Yes - Go to the next step.
No - Go to Method For Recovering Missing TCU, then go to next step.
3. Check for:



Missing fuses
Blown fuses
Correct fuse amperage
Page 2 of 5
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.
© 2020 Mazda North American Operations, U.S.A.
02/26/2020 10:36 AM tlawrenc
Service Alert No.: SA-029/20
Last Issued: 02/25/2020
4. Are any DTC(s) stored?


Yes - See table below:
No - Contact hotline for latest repair information.
DTC
Action
1. Check GPS antenna connection.
1. GPS connection is good - No further repairs needed. TSB repair is coming soon.
2. GPS connection is bad - Repair GPS antenna connection.
B119F:01
1. Check USB cable connections between TCU and CMU.
B1252:87
U0156:00
1. Refer to the instructions on MGSS.
1. Mazda3 DTC U0156:00 [BODY CONTROL MODULE (BCM)]
2. CX-30 DTC U0156:00 [BODY CONTROL MODULE (BCM)]
Page 3 of 5
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.
© 2020 Mazda North American Operations, U.S.A.
02/26/2020 10:36 AM tlawrenc
Service Alert No.: SA-029/20
Last Issued: 02/25/2020
1. Check USB cable connections between TCU and CMU.
U0198:00
U212D:00
1. Refer to the instructions on MGSS.
1. Mazda3 DTC U212D:00 [BODY CONTROL MODULE (BCM)]
2. CX-30 DTC U212D:00 [BODY CONTROL MODULE (BCM)]
U3000:00
1. Replace TCU. Refer to the instructions on MGSS.
1. Mazda3 TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION.
2. CX-30 TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION.
Other DTC's Refer to the instructions on MGSS.
5. Verify repair.
Page 4 of 5
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.
© 2020 Mazda North American Operations, U.S.A.
02/26/2020 10:36 AM tlawrenc
Service Alert No.: SA-029/20
Last Issued: 02/25/2020
Method For Recovering Missing TCU
a.
ID vehicle using
MDARS.
b. IG OFF.
c. Refresh DTC.
d.
IG ON while
refreshing DTC.
TCU now
e. appears.
Go to step 3.
TCU appears
Page 5 of 5
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.
© 2020 Mazda North American Operations, U.S.A.
02/26/2020 10:36 AM tlawrenc