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-025/23

04/21/23

SA-034/22

05/20/22

SA-004/21

09/13/21, 06/02/21, 05/24/21 and 01/19/21

SA-010/20

06/29/20, 06/01/20, 05/08/20, 04/29/20 and 01/15/20

APPLICABLE MODEL(S)/VINS
2019-2024 Mazda3

2021-2024 CX-5

2022-2023 MX-30

2020-2024 CX-30

2021-2023 CX-9

2023-2024 CX-50

2024 CX-90

DESCRIPTION
When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to activate the new TCU
after replacement.
Use the information in this service alert to initialize the new TCU until the procedure on MGSS is updated..
CAUTION:
• DO NOT swap TCU with another vehicle as the TCU is VIN locked after activation. A TCU swap with another
vehicle will disable Connected Services on both vehicles.
• If TCU activation is not performed, connected vehicle functions will not operate. This will have a negative impact
on the customer because they will need to return to the dealer for repairs.

TCU Activation
1. Install the new TCU.
• Mazda3 - TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION
• CX-30 - TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION
2. Use the DCA8000 battery charger SST to maintain battery voltage. Go to SA-034/21.
3. Confirm M-MDS hardware that is in good working condition. Go to SA-066/20.
4. Turn the ignition ON (engine ON or OFF).
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5. Connect MDARS to the vehicle.

6. Select "Tool Box".

7. Select the repair icon.

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8. Select "Mazda Connect"

9. Select Activating TCU
(links TCU to server) ->
"Run".
Wait for "initialization
complete" message.
NOTE: MDARS may show
"Incomplete". This may be
caused by:
• Advanced key is not in
the vehicle.
• Connected vehicle
maintenance mode is
enabled.
• Pacemaker radio wave
interference prevention
is enabled.
• key transmitter power
saving function is
enabled. See SA-020/
21.

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10. Check the Items as shown
(A) then select "Next" (B)

11. Select Activating Remote
Control by Smart Phone (links
TCU to BCM) -> "Run".
Wait for "initialization
complete" message.

If customer was previously enrolled, reception strength icon will show normal

12. Turn Ignition OFF and
wait at least 2 minutes.
13. Turn Ignition ON and then
check reception strength.
If customer was not previously enrolled, reception strength icon will show "X", this is a
normal Deactivation Mode function.

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Customer/Dealer can activate CV services anytime via MyMazda app (there just might
be a slight delay in making the backend connection since it was temporarily
deactivated).
14. Clear DTC's
NOTE:
• New TCU replacement part may not have the latest software version installed. See Parts Information.
• Perform the following steps to confirm TCU software version is at:
10006 or later for CX-30 and Mazda3
10023 or later for CX-5 and CX-9
10003 or later for CX-50
10019 or later for MX-30
○
○
○
○

CX-5 and CX-9

CX-30 and Mazda3

a. Press and hold the Volume
knob, then press and hold the
Entertainment and Favorite
buttons at the same time for
3-5 seconds and the Factory/
Service Inspection screen will
appear.

b. Select Service Information.

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c. Select TCU Linked
information.

d. Scroll down to TCU
Software Version and confirm
the software version is at:
• 10006 or later for CX30 and Mazda3
• 10023 or later for CX-5
and CX-9
• 10003 or later for CX50
• 10019 or later for MX30
Is the TCU software version
correct?
• Yes: Repair is
complete.
• No: Go to MGSS ->
Infotainment/TCU ->
Telematics
Communication Unit
(TCU) Updates to
update the TCU
software version.
See Warranty
Information for
software update
payment.
○

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NOTE:
• If DTC U2050:55-TCU (Activation of remote control not implemented) is stored, go to TSB 09-013/20 - DTC
U2050:55 STORED AFTER REPLACING OR REPROGRAMMING TCU.
• If the TCU was not replaced and MDARS shows error code 400t02 and/or ERROR:05, TCU activation was
previously completed. Ignore these errors as TCU activation is not required.
ERROR:05

Error code 400t02

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PARTS INFORMATION
Model

CX-5

CX-9

Mazda3

CX-30

Base Part
Number

KJK9-67CM0

TC3M-67CM0

BGMC-67CM0

DGH9-60CM0

Description

DATA
COMMUNICATION
MODULE

DATA
COMMUNICATION
MODULE

DATA
COMMUNICATION
MODULE

DATA
COMMUNICATION
MODULE

Suffix

Action

"B" or
earlier

Go to MGSS -> Infotainment/TCU -> Telematics
Communication Unit (TCU) Updates to update the TCU
software version.

"C" or
later

TCU softtware update is not required

"B" or
earlier

Go to MGSS -> Infotainment/TCU -> Telematics
Communication Unit (TCU) Updates to update the TCU
software version.

"C" or
later

TCU softtware update is not required

"A" or
earlier

Go to MGSS -> Infotainment/TCU -> Telematics
Communication Unit (TCU) Updates to update the TCU
software version.

"C" or
later

TCU softtware update is not required

"F" or
earlier

Go to MGSS -> Infotainment/TCU -> Telematics
Communication Unit (TCU) Updates to update the TCU
software version.

"G" or
later

TCU softtware update is not required

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WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
• This repair will be covered under Mazda’s New Vehicle Limited Warranty
• Additional diagnostic time cannot be claimed for this repair.
Warranty Type

A

Symptom Code

99

Damage Code
Part Number Main Cause
Quantity

99
**** -67-CM0 *
1

Operation Number / Hours
(For Replacement)

T0524XRX
Mazda3 / 0.4 Hrs.
’20 CX-30 / 0.5 Hrs.
’21 CX-30 / 0.6 Hrs.
CX-5 / 0.6 Hrs.
CX-9 / 0.7 hrs.

Operation Number / Hours
(For Reprogramming)

T0524XRT / 0.4 Hrs. (Max)

NOTE: All claims will pend for adjuster review.

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