NHTSA ID Number: 11025591
Manufacturer Communication Number: 25-01-028H-1 TSB
TSB/Document Date: 2025-11-18
Summary
Certain Santa Fe Hybrid
(MX5A HEV) vehicles may experience battery drain and inoperative heated seat capacitive touch buttons 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
Technical Service Bulletin
SUBJECT:
25-01-028H-1
DATE
MODEL(S)
NOVEMBER 2025
SANTA FE HYBRID
(MX5A HEV)
SEAT HEATER UNIT (SHU) SOFTWARE UPDATE
(LIMITED COVERAGE CAMPAIGN LA1A)
This TSB supersedes 25-01-028H to add 2026 model year and update the production dates on
page 1 and revise the ROM ID table on page 3.
IMPORTANT
Dealers must perform this field action on all affected vehicles within 5 / 60,000 New Vehicle Limited
Warranty (NVLW) prior to customer retail delivery and whenever an affected vehicle is in the shop
for any maintenance or repair. See Warranty Information section for more details.
Access the “Vehicle Information” screen via WebDCS to verify “Warranty Start Date” and ensure the
vehicle is within NVLW, observing mileage prior to any repair work.
Description: Certain Santa Fe Hybrid (MX5A HEV) vehicles may experience battery drain and
inoperative heated seat capacitive touch buttons 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. There is no known issue with ventilated seat equipped models, however, technicians
must select SHVU-F to perform the correct software update for the Seat Heater Unit – Front
(SHU_FRT).
Applicable Vehicles (Certain):
Model Year
Model
Production Dates
2024 – 2026
Santa Fe Hybrid (MX5A HEV)
03/06/2024 – 07/11/2025
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 (LIMITED COVERAGE CAMPAIGN LA1A)
SST Information:
Tool Name
Tool Number
VCI 3
Figure
Ordering Information
G0VHNNN06
Website:
https://hyundaiessentialtools.com/
Email:
[email protected]
VCI 2
Phone: 1-855-763-9199
Hours: 7 AM – 7 PM CST
G1XDDMN001
NOTE: VCI 2 is NO longer able to be ordered, but can be used for the updates in the TSB.
GDS Information:
System
Event Number
Description
SHVU-F
1305
MX5a HEV Heater Button INOP Improvement (SHVU_FR)
(*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
Santa Fe
Hybrid
50DA45R0
(MX5A HEV)
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
Seat Heater Unit (SHU)
Software Update
0.3 M/H
88B70-R6020
W11
ZZ3
NOTE 1: Submit claim on Claim Entry Screen as "Campaign" type.
NOTE 2: 5 / 60,000 New Vehicle Limited Warranty (NVLW) applies to the part(s) and repair
procedure(s) outlined in this TSB. Prior to beginning any repair work, ensure the part(s) associated
with the repair procedure are within NVLW, observing mileage and Warranty Start Date or date of first
use. If the subject part(s) are out of warranty coverage, the dealer has the option to submit a PA
Request for goodwill consideration on a case-by-case basis.
NOTE 3: If any part(s) not subject to this TSB are found in need of replacement while performing the
repair procedure, and the affected part(s) are still under warranty, the dealer may submit a separate
claim using the same repair order. If the part(s) not subject to this TSB are out of warranty coverage,
the dealer has the option to submit a PA Request for goodwill consideration on a case-by-case basis.
NOTE 4: This TSB includes repair validation photos. Op times include VIN, mileage, and photo
capture of the ECU Update "Success" screen as outlined in the Digital Documentation Policy.
TSB #: 25-01-028H-1
Page 2 of 7
SUBJECT: SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (LIMITED COVERAGE CAMPAIGN LA1A)
ROM ID Information:
Model
System
ECU
Part Number
Santa Fe Hybrid
(MX5A HEV)
SHVU-F
88B70-R6020
ROM ID
Old
New
1.00
1.10
1.20
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 place in Ready mode during the update.
•
Do NOT turn OFF the ignition switch during update.
TSB #: 25-01-028H-1
Page 3 of 7
SUBJECT: SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (LIMITED COVERAGE CAMPAIGN LA1A)
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.
2.
Select the SHVU_F system to scan the
vehicle’s current ROM ID.
Press the update button and follow the on
screen prompts.
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, remove the power
connector from the in-cabin fuse box for
at least 5 seconds. Alternatively,
disconnect the negative (–) 12V battery
terminal and wait at least 5 seconds.
Reassemble and 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).
TSB #: 25-01-028H-1
Page 4 of 7
SUBJECT: SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (LIMITED COVERAGE CAMPAIGN LA1A)
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.
4.
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.
TSB #: 25-01-028H-1
Page 5 of 7
SUBJECT: SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (LIMITED COVERAGE CAMPAIGN LA1A)
5.
DIGITAL
DOCUMENTATION
Using the tablet or GDS screen capture
function, take a screenshot of the ECU
Update “Success” result screen.
Upload the photo to STUI.
NOTE: The VIN/Date/Time/Mileage photo
imprint is NOT required for GDS
screenshots.
6.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
7.
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.
TSB #: 25-01-028H-1
Page 6 of 7
SUBJECT: SEAT HEATER UNIT (SHU) SOFTWARE UPDATE (LIMITED COVERAGE CAMPAIGN LA1A)
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
ECU Menu
Password
1305
MX5a SHVU_FR 88B70-R6000/20
9996
TSB #: 25-01-028H-1
Page 7 of 7
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TSB/Document ID: 25-01-028H-1 TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2025-11-12
MFR Internal Campaign ID/Software Version: LA1A
Communication Type: Service Campaign
NHTSA Components: SEATS
MFR Component System:
MFR Component Subsystem:
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