2020-2022 Nissan Models TCU Reset for DTC B2E1B-97

The Telematics Control Unit (TCU) in certain 2020-2022 Nissan vehicles is designed to send an automatic collision notification in the event of an accident. However, once this notification is performed, the TCU's automatic collision notification function becomes disabled. This condition prevents future automatic notifications until the unit is properly reset.

Nissan Technical Service Bulletin (TSB) NTB20-085A provides a detailed procedure for authorized technicians to reset the TCU. This reset is crucial for re-enabling the safety feature. In some cases, affected models may also store Diagnostic Trouble Code (DTC) B2E1B-97, indicating an "Automatic eCAll locked" status, which signifies the disabled function. This bulletin ensures that the Nissan TCU reset B2E1B-97 procedure is correctly followed.

Symptoms

Owners may notice that the automatic collision notification system is no longer active after an accident. While there might not be a direct dashboard warning for the owner, technicians will observe the following:

• The automatic collision notification function of the Telematics Control Unit (TCU) is disabled.
• The TCU may store Diagnostic Trouble Code (DTC) B2E1B-97 as "CURRENT".
• During diagnostic checks, the TCU's status for automatic report prevention release may display as "LOCK".

Fault Codes / DTCs

When the automatic collision notification function is disabled, the following Diagnostic Trouble Code (DTC) may be present:

Code	Description	Module
B2E1B-97	Automatic eCAll locked	Telematics Control Unit (TCU)

Diagnosis and Trigger Conditions

This condition is specifically triggered after a vehicle has been involved in an accident and its Telematics Control Unit (TCU) has successfully performed an automatic collision notification. Once this event occurs, the TCU's eCAll function locks itself, preventing further automatic notifications until a specific reset procedure is carried out. Technicians will confirm the presence of DTC B2E1B-97 and verify the TCU's "LOCK" status using diagnostic tools.

Repair Procedure Summary

Nissan Technical Service Bulletin NTB20-085A outlines the steps for a qualified technician to perform the Nissan TCU reset B2E1B-97 using the CONSULT-III plus diagnostic system:

1. Preparation: Before starting, the technician must ensure that the ASIST (Aftersales Service Information System) on the CONSULT PC is synchronized to the current date and all necessary CONSULT software updates have been installed.
2. Connect Vehicle Interface (VI): The VI is connected to the vehicle, and CONSULT-III plus is started. The system waits for the VI to be recognized, indicated by the display of its serial number.
3. Select Diagnosis: From the main menu, the technician selects "Diagnosis (One System)".
4. Select IVC: The Intelligent Vehicle Control (IVC) module is selected within the diagnostic system.
5. Check CGW Information: The technician checks the Central Gateway (CGW) Information. If a red indicator is present, they must select "CGW Open" and follow login instructions to proceed. If the indicator is green, they can proceed directly.
6. Work Support: Under the IVC section, "Work support" is selected, followed by "Automatic report prevention release".
7. Initiate Reset: If the "Current status" displayed is "LOCK", the technician selects "Start" to initiate the reset process. If the status is already "UNLOCK", no reset is needed, and they can select "End".
8. Finalization: After the reset is complete, the technician selects "End" and then performs an "Erase All DTCs" to clear any stored fault codes, including B2E1B-97, from the TCU.

Required Tools or Parts

Performing this reset procedure requires specific diagnostic equipment available at authorized Nissan service centers:

• CONSULT-III plus diagnostic system: This is the primary diagnostic tool used for Nissan vehicles.
• ASIST (Aftersales Service Information System): Used for software updates and synchronization.
• Vehicle Interface (VI): The hardware component that connects the diagnostic system to the vehicle.

Important Warnings

Nissan emphasizes that this procedure is intended for trained professionals:

"Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Nissan dealer to determine if this applies to your vehicle."

What Owners Should Do

If your 2020-2022 Nissan has been involved in an accident and you are concerned that the automatic collision notification system may be disabled, or if you suspect any related issues, it is essential to contact your authorized Nissan dealer. They possess the specialized diagnostic equipment and trained technicians required to perform the Nissan TCU reset B2E1B-97 procedure correctly and ensure all safety features are fully functional.

Source: NHTSA ID 10213681