NHTSA ID Number: 11017338
Manufacturer Communication Number: 25-01-028H TSB
TSB/Document Date: 2025-04-30
Summary
Certain Santa Fe Hybrid
(MX5A HEV) vehicles may experience battery drain due to incorrect ECU logic for the Seat Heater Unit – Front (SHU_FRT). This bulletin provides instructions to perform a software update for the Seat Heater Unit – Front to correct the logic.
GROUP
NUMBER
CAMPAIGN
DATE
Technical Service Bulletin
SUBJECT:
25-01-028H
MODEL(S)
APRIL 2025
SANTA FE HYBRID
(MX5A HEV)
SEAT HEATER UNIT (SHU) SOFTWARE UPDATE
(SERVICE CAMPAIGN TCVA)
IMPORTANT
Dealers must perform this service campaign on all affected vehicles prior to customer retail delivery
and whenever an affected vehicle is in the shop for any maintenance or repair.
Access the “Vehicle Information” screen via WebDCS to identify open campaigns.
Description: Certain Santa Fe Hybrid (MX5A HEV) vehicles may experience battery drain due to
incorrect ECU logic for the Seat Heater Unit – Front (SHU_FRT). This bulletin provides instructions to
perform a software update for the Seat Heater Unit – Front to correct the logic.
NOTICE
The system is incorrectly labeled under Seat Heater Ventilation Control Unit – Front (SHVU-F)
within GDS. Technicians MUST select SHVU-F to perform the correct software update for the
Seat Heater Unit – Front (SHU_FRT).
Applicable Vehicles (Certain):
• 2024-2025MY Santa Fe Hybrid (MX5A HEV) produced 03/06/2024 – 12/07/2024
SST Information:
Tool Name
VCI 3
Tool Number
G0VHNNN06
Figure
Ordering Information
Website:
https://hyundaiessentialtools.com/
Email:
[email protected]
VCI 2
G1XDDMN001
Phone: 1-855-763-9199
Hours: 7 AM – 7 PM CST
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (SERVICE CAMPAIGN TCVA)
GDS Information: Seat Heater Ventilation Control Unit - Front
System
Event Number
Description
SHVU-F
1247
MX5A SHU_FRT LOGIC IMPROVEMENT
(*or use a later available event as listed in the GDS SHVU-F Update screen if one is available.)
NOTE 1: The software update is subject to an OTA (Over-the-Air) option and may be completed by
customers with active Bluelink subscriptions.
Warranty Information:
Model
Op. Code
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
Santa Fe
Seat Heater Unit (SHU)
Hybrid
50DA26R0
0.3 M/H
88B70-R6020
W11
ZZ3
Update
(MX5A HEV)
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: If a part is found in need of replacement while performing this campaign and the affected
part is still under warranty, submit a separate claim using the same repair order. If the affected part is
out of warranty, submit a Prior Approval request for goodwill consideration prior to performing the
work.
NOTE 3: Op times include VIN, Mileage, and photo capture of the “ECU update complete” screen as
outlined in the Digital Documentation Policy.
ROM ID Information:
ROM ID
Model
System
ECU
Part Number
Old
New
Santa Fe
Hybrid
(MX5A HEV)
SHVU-F
88B70-R6020
1.00
1.10
TSB #: 25-01-028H
Page 2 of 6
SUBJECT:
SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (SERVICE CAMPAIGN TCVA)
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes Repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
You must initially perform the GDS ECU update in Auto Mode.
• If the ECU update starts but then fails in Auto Mode, perform the update in Manual Mode
to recover.
NOTICE
Ensure the vehicle’s battery charge is above 11.0 Volts and the tablet’s battery charge is above
30% before performing a software update to avoid the update from failing.
i
Information
•
Turn OFF all lamps (do NOT leave head lamp switch in auto mode) and all accessories.
•
Perform update with the ignition switch in the ON position.
•
Do NOT disconnect any cables connected to the vehicle or scan tool during update.
•
Do NOT start the engine during update.
•
Do NOT turn OFF the ignition switch during update.
ECU Update Procedure
1.
Perform the ECU update in Auto Mode.
Use the ID Check to verify the ROM ID before
updating the software.
i
Information
Refer to TSB # 24-GI-012H, “ECU
Update Procedure for Tablet-Based
GDS-Smart”, for additional information.
TSB #: 25-01-028H
Page 3 of 6
SUBJECT:
2.
SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (SERVICE CAMPAIGN TCVA)
Select the SHVU_F system to scan the
vehicle’s current ROM ID.
NOTICE
Check the current ROM ID version and
compare it to the ROM ID Information
table before attempting to perform the
software update.
NOTICE
If the update fails, please remove the
power connector or the battery (–)
connector from the indoor fuse box for at
least 5 seconds and reassemble it to
retry the update.
NOTICE
The system is incorrectly labeled under
Seat Heater Ventilation Control Unit –
Front (SHVU-F) within GDS. Technicians
MUST select SHVU-F to perform the
correct software update for the Seat
Heater Unit – Front (SHU_FRT).
3.
After the ECU update process shows 100%
complete, follow the prompts on the screen to
cycle the ignition OFF for at least 10 seconds
to reset the control unit (certain models may
take up to 30 seconds).
i
Information
Use the Refresh button to reset the
timer.
TSB #: 25-01-028H
Page 4 of 6
SUBJECT:
4.
SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (SERVICE CAMPAIGN TCVA)
DIGITAL
DOCUMENTATION
Take a screenshot of the ECU update
complete screen using your tablet and
upload to STUI.
5.
After clicking OK, the OTA Initialization
process will begin.
• If OTA initialization performs
automatically, then proceed with the
service procedure.
• If the OTA initialization fails, connect
GDS-Smart > S/W Management >
Central Communication Unit (CCNF)
> OTA Initialization
Follow the instructions on the screen.
6.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
TSB #: 25-01-028H
Page 5 of 6
SUBJECT:
7.
SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (SERVICE CAMPAIGN TCVA)
Disconnect the power connector (A) of the
indoor fuse box, wait at least 5 seconds, then
reconnect it.
i
Information
A
Alternatively, disconnect the negative (–)
12V battery terminal, wait 5 seconds,
then reconnect it.
8.
Place in Ready mode to confirm proper
operation of the vehicle.
NOTICE
If the ECU update fails in Auto Mode, perform the update in Manual Mode using the password(s)
below.
Manual Mode Password:
Event
ECM Menu
Password
1247
MX5A HEV SHU_FRT 88B70-R6020
6020
TSB #: 25-01-028H
Page 6 of 6
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TSB/Document ID: 25-01-028H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2025-04-23
MFR Internal Campaign ID/Software Version: TCVA
Communication Type: Service Campaign
NHTSA Components: SEATS
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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