2021-2022 Hyundai Immobilizer Logic Update TSB

Overview of Service Campaign 993

Hyundai has released Technical Service Bulletin (TSB) 23-01-014H-5, superseding the previous TSB 23-01-014H-4, to address the immobilizer logic and security features in various models. This bulletin, identified as Service Campaign 993, outlines a procedure to update the Integrated Body Control Unit/Body Control Module (IBU/BCM) software and install anti-theft decals on affected vehicles. This update aims to enhance the vehicle's security by revising the operation of the OEM Hyundai burglar alarm system and ignition start logic.

This service campaign is particularly relevant for owners of 2021-2022 Hyundai Tucson, Elantra, Accent, Santa Fe, Kona, Veloster, Venue, and Palisade models, among others, that were not originally equipped with an immobilizer or a START/STOP ignition button. The update ensures that these vehicles receive improved security measures.

The Immobilizer Logic Issue

An immobilizer system is a crucial security feature designed to prevent vehicle theft by ensuring that the engine can only be started with the correct key or key fob. Certain Hyundai vehicles, including many 2021-2022 Hyundai Tucson models, were manufactured without this critical component, making them more vulnerable to theft. This TSB directly addresses this vulnerability by providing a software update to the IBU/BCM, which controls various electrical functions, including the vehicle's security systems.

The software update revises the existing OEM Hyundai burglar alarm system operation and modifies the ignition start logic. This means that after the update, the vehicle's internal systems will have an enhanced mechanism to deter theft. The installation of anti-theft decals serves as a visible deterrent, signaling the presence of these enhanced security features.

Important Warnings and Owner Information

Hyundai has provided several critical warnings and pieces of information for both technicians and vehicle owners regarding Service Campaign 993 (TSB 23-01-014H-5):

• Aftermarket Systems: "Vehicles equipped with aftermarket/add-on alarms or remote start systems may not operate normally if the IBU/BCM is updated with this software." Owners with such systems should be aware of potential compatibility issues.
• Manual Software Update Preparation: "Before performing the AUTO software update, write down or take a picture of the current ROM ID in case MANUAL update is required. This information will be used to select the correct MANUAL passcode/event." This step is vital for technicians to ensure a smooth update process.
• Unidentified ROM ID: "If Auto Mode update is not available due to unidentified ROM ID, then DO NOT perform the update using Manual Mode, call Techline for further instructions." This prevents incorrect software application.
• Passcode Selection: "When selecting the MANUAL PASSCODE, pay close attention to the part number and software version in the table. The selected passcode and event should match with what was originally in the vehicle." Accuracy in this step is paramount for the correct functioning of the Hyundai Tucson immobilizer logic.
• Software Update Failure Protocol: "If the software is updating and fails(not relating to GDS disconnection or battery died) at any percentage, then try the following: o Select OK when the error message pops up, and DO NOT SELECT ANYTHING ELSE, LEAVE EVERYTHING AS IS. o Turn the ignition OFF for 15 seconds and then turn it back ON. o Proceed with MANUAL update procedure following the GDS screen instructions." This provides a specific recovery method for technicians.
• Tinted Windows: "The anti-theft decals can be installed over a tinted window film." However, "If the window is tinted with a non-legal shade, inform the customer of the possible poor visibility of the anti-theft decals." Owners should be aware that tinting might obscure the decals.
• Key Fob Operation Post-Update: "Once the upgrade procedure has been completed, the key fob buttons to lock and unlock the vehicle are required to activate/deactivate the anti-theft system. After using the key fob to activate the anti-theft system, the key fob must be used to first disarm the system prior to attempting to start the vehicle." This is a crucial change in vehicle operation that owners must understand to avoid issues starting their vehicle.

Repair Procedure Overview: Software Update and Decal Installation

The service procedure for TSB 23-01-014H-5 involves a two-part process: an initial inspection followed by the IBU/BCM software update and anti-theft decal installation.

Initial Inspection

Technicians first visually inspect the vehicle to determine if it is equipped with a START/STOP button or an immobilizer lamp on the instrument cluster. If either of these features is present, the vehicle is considered to have sufficient security, and only an inspection claim is submitted. Technicians must take photos using the STUI system, showing the START/STOP button or immobilizer lamp along with the last 6 digits of the VIN and the repair date. If the vehicle lacks both features, it proceeds to the software update phase.

IBU/BCM Software Update

For vehicles requiring the update, technicians use the Global Diagnostic System (GDS) to perform a software flash on the Integrated Body Control Unit/Body Control Module. This process includes:

1. System Selection: Selecting the IBU/BCM as the system to be updated within the GDS.
2. ID Check: Performing an ID check to verify the current ROM ID of the IBU/BCM. This current ROM ID is crucial for selecting the correct manual passcode if an automatic update fails.
3. GDS Software Update: Following the GDS ECU update procedures, which are detailed in a separate TSB, 15-GI-001. During this update, the anti-theft decals are also installed.
4. Verification: Ensuring the software update is successful and the IBU/BCM has the latest ROM ID.
5. DTC Clearing: After the update, technicians check for and erase any Diagnostic Trouble Codes (DTCs) from all menus.

Anti-Theft Decal Installation

Two anti-theft decals (part number NP001-SC993) are installed on the front driver and passenger windows. The installation process is precise:

1. Template Preparation: A template from the TSB is printed, folded, and two rectangular cutouts are made.
2. Window Cleaning: The inside lower corners of both front windows are thoroughly cleaned with rubbing alcohol.
3. Template Alignment: The template is aligned approximately 1/4 inch from the edge of any existing labels or decals on the window and secured with masking tape.
4. Decal Application: The anti-theft decal is carefully peeled halfway from its backing, ensuring the adhesive side is not touched to prevent fingerprints from reducing adhesion. It is then aligned within the template's cutout and firmly pressed onto the window glass with a thumb.
5. Final Steps: The template is removed, and the decal is pressed again to ensure no air bubbles. This process is repeated for the other window.
6. STUI Photos: Final STUI photos are taken of both installed decals, clearly showing the decal, the last 6 digits of the VIN, and the repair date.

Technical Details for Technicians (ROM IDs and Passcodes)

The TSB includes extensive tables detailing the specific ROM IDs and passcodes required for the IBU/BCM software update across various Hyundai models and model years. These tables are critical for technicians to ensure the correct software version is applied to each vehicle's Integrated Body Control Unit/Body Control Module. Each model, such as the 2021-2022 Hyundai Tucson, has unique event descriptions, such as "973. NX4 IMMOBILIZER (BCM) LOGIC IMPROVEMENT" for the Tucson (NX4), and corresponding manual mode passcodes (e.g., 1238 or 9181) and ROM ID part numbers (e.g., 95400-N9000 or 95400-K2500). The document provides both old and new ROM IDs to guide the update process. Selecting the correct passcode and ROM ID is essential to properly update the Hyundai Tucson immobilizer logic and other models, preventing potential issues with the vehicle's security and ignition systems.

Required Parts and Tools

To perform this service campaign, technicians will need the following:

• Anti-Theft Decal (Part Number NP001-SC993): Two decals are required per vehicle, and they are typically ordered in rolls of 500.
• Global Diagnostic System (GDS): This specialized diagnostic tool is essential for performing the IBU/BCM software update.
• STUI (Service Technical Update Information) System: Used for capturing and uploading required photos of the inspection and decal installation.
• Rubbing Alcohol and Clean Rag: For cleaning window surfaces prior to decal application.
• Masking Tape: To secure the decal installation template.

Owner Action

If you own a 2021-2022 Hyundai Tucson or another affected Hyundai model that was not originally equipped with an immobilizer or a START/STOP ignition button, it is important to ensure this service campaign has been performed. You can contact your authorized Hyundai dealer to check if your vehicle is part of Service Campaign 993 (TSB 23-01-014H-5). The dealer can verify your vehicle's eligibility using the "Vehicle Information" screen via WEBDCS to identify open campaigns. This update is performed free of charge as part of the service campaign to enhance your vehicle's security.

NHTSA ID: 10238353