2024 Hyundai Tucson Warning Light & Turn Signal Error TSB

Hyundai has released Service Campaign 24-01-047H to address specific software-related issues affecting the 2024 Hyundai Tucson (NX4A) model. This campaign focuses on rectifying an incorrect rear seat belt warning light and a "Check turn signal" error message that may appear on the vehicle's instrument cluster. The solution involves updating the software for the Integrated Control Unit (ICU).

Why This Matters

An incorrect rear seat belt warning light can cause unnecessary concern for drivers and passengers, potentially leading to confusion about actual safety conditions. Similarly, a "Check turn signal" error message can be distracting and misleading, suggesting a fault where none exists, or masking a real issue with the turn signal system. Resolving these software glitches ensures accurate vehicle feedback and improves driver confidence.

Symptoms

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

• An incorrect "seat belt warning light for the rear seats illuminating incorrectly" on the instrument cluster.
• A "Check turn signal" error message displayed on the cluster.

These symptoms indicate a software anomaly within the Integrated Control Unit (ICU) that requires an update.

Important Warnings and Notices

Hyundai emphasizes several critical points for this service campaign:

• Dealers are required to perform this service campaign on all affected vehicles before customer retail delivery. It must also be completed whenever an affected vehicle is in the shop for any maintenance or repair.
• Dealers should access the "Vehicle Information" screen via WebDCS to identify any open campaigns for a specific vehicle.
• If the GDS (Global Diagnostic System) displays a warning for low battery voltage (below 12 volts) during the update, technicians must attach a battery charger. The ignition should be turned back ON, and the ECU update retried to ensure reliable results.
• Should the ECU update fail, technicians are instructed to remove the power connector or the battery (-) connector from the indoor fuse box for at least 5 seconds before reassembling and retrying the upgrade.
• The GDS ECU update must initially be performed in Auto Mode. If the update begins but then fails in Auto Mode, it should be recovered by performing the update in Manual Mode.

Repair Procedure Summary

The repair for the incorrect rear seat belt warning and the Hyundai Tucson turn signal error involves updating the Integrated Control Unit (ICU) software using the Global Diagnostic System (GDS). The process includes:

1. Preparation: Ensure the vehicle battery voltage is adequate. If low, connect a battery charger as per GDS warnings.
2. GDS Connection: Perform the ECU update in Auto Mode using the GDS.
3. ROM ID Verification: Select the ICU system in GDS to scan the vehicle's current ROM ID. Compare this to the ROM ID Information Table (Old ROM ID 3020, New ROM ID 3021) to confirm the correct software version.
4. Update Execution: Proceed with the software update. If the update fails, follow the specific instructions for power cycling the ECU or battery connection.
5. Ignition Cycle: After the update reaches 100% completion, cycle the ignition OFF for at least 10 seconds (up to 30 seconds for some models) to reset the control unit.
6. Documentation: Take a screenshot of the "ECU update complete" screen and upload it to the STUI system.
7. DTC Erase: Perform an All Systems Fault Code search and erase any Diagnostic Trouble Code (DTC) history that may have occurred incidentally during the ECU update process.
8. Verification: Start the engine to confirm the proper operation of the vehicle and that the Hyundai Tucson turn signal error and seat belt warning issues are resolved.

For general ECU update procedures, technicians are referred to TSB 15-GI-001.

Required Tools or Parts

• Hyundai Global Diagnostic System (GDS)
• Battery charger (if battery voltage is low)
• The new ROM ID 3021 software for ICU ECU Part Numbers: 91951-CW113, 91951-CW123, 91951-CW133, 91951-CW143.

Owner Action

If you own a 2024 Hyundai Tucson and experience an incorrect rear seat belt warning light or the "Check turn signal" error message, you should contact your authorized Hyundai dealer. This software update is performed under Service Campaign 24-01-047H and will be completed by the dealer free of charge. It is also recommended to have this update performed during your next scheduled maintenance visit if it has not already been applied.

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Source: NHTSA ID: 11014133