2024 Hyundai Tucson Seat Belt & Turn Signal Error TSB

Hyundai has released Technical Service Bulletin (TSB) 24-01-047H to address specific software-related concerns in certain 2024 Hyundai Tucson (NX4A) vehicles. Owners may notice an incorrect rear seat belt warning light or a "Check turn signal" error message appearing on the instrument cluster. This bulletin outlines a software update for the Integrated Control Unit (ICU) to correct these conditions, ensuring proper functionality and driver information.

This service campaign, identified as 24-01-047H, is crucial for maintaining vehicle safety and operational accuracy. The update aims to prevent misleading warnings and ensure that critical vehicle signals are communicated correctly to the driver. If you experience a "Hyundai Tucson seat belt warning" or a "Check turn signal" message, your vehicle may require this update.

Symptoms

Owners of affected 2024 Hyundai Tucson vehicles may observe one or both of the following issues:

• An "RR SEAT BELT Warning" light for the rear seats illuminating incorrectly, even when no occupants are present or seat belts are properly fastened.
• A "Check turn signal" error message displayed on the instrument cluster, indicating a potential malfunction with the turn signal system.

Important Warnings for Owners

Hyundai has issued several important advisories regarding this service campaign:

• Dealers are required to perform this service campaign on all affected vehicles prior to customer retail delivery. It must also be performed whenever an affected vehicle is in the shop for any maintenance or repair.
• If the ECU update process begins but then fails in Auto Mode, the update must be performed in Manual Mode to recover.
• Should the upgrade fail, technicians are instructed to remove the power connector or the battery (-) connector from the indoor fuse box for at least 5 seconds and then reassemble it to retry the upgrade.

Repair Procedure Summary

The resolution for the incorrect "Hyundai Tucson seat belt warning" and "Check turn signal" error involves updating the software of the Integrated Control Unit (ICU). The procedure is performed using the Hyundai Global Diagnostic System (GDS) and generally follows these steps:

1. The technician will perform the ECU update in Auto Mode. If the vehicle's battery voltage is below 12 volts, a battery charger must be connected to ensure a stable power supply for the update.
2. The current ROM ID of the vehicle's ICU will be scanned and compared against the latest available ROM ID (3021, replacing old ID 3020) to confirm the need for the update.
3. After the software update reaches 100% completion, the ignition must be cycled OFF for 10 to 30 seconds to reset the control unit.
4. A screenshot of the "ECU update complete" screen is taken for documentation.
5. An "All Systems Fault Code" search is performed, and any incidentally stored Diagnostic Trouble Code (DTC) history from the update process is erased.
6. The engine is started to confirm the proper operation of the vehicle and verify that the "Hyundai Tucson seat belt warning" and "Check turn signal" messages no longer appear.

For detailed instructions on the ECU update procedure, technicians are referred to TSB 15-GI-001. The GDS Event number associated with this update is 1113, described as "NX4a 24MY ICU SW UPGRADE(TURN SIGNAL CONTROL LOGIC)".

Required Tools or Parts

To perform this software update, technicians will utilize the Hyundai Global Diagnostic System (GDS) and may require a battery charger to maintain stable voltage during the update process. The relevant ECU part numbers for the ICU are 91951-CW113, 91951-CW123, 91951-CW133, and 91951-CW143.

Warranty Information

This service campaign is covered under warranty. The operation code for the ICU Software Update is 40DA05R0, with an estimated operation time of 0.3 hours. The casual part number associated with this update is 91951-CW113. Claims should be submitted as a "Campaign" type. If any other parts are found to be defective during this campaign, separate warranty claims may be necessary.

Owner Action

If you own a 2024 Hyundai Tucson and are experiencing an incorrect "Hyundai Tucson seat belt warning" or a "Check turn signal" error message, it is recommended to schedule an appointment with your authorized Hyundai dealer. This software update is a service campaign and should be performed free of charge. Dealers are instructed to perform this update on all affected vehicles, including those awaiting retail delivery and those in for other maintenance or repair.

NHTSA ID: 11006089