2021-2022 Audi e-tron Battery Software Update TSB 93N6

Audi has issued Technical Service Bulletin (TSB) 93N6 to provide a software update for the battery modules control unit in certain 2021-2022 Audi e-tron and e-tron Sportback vehicles. This proactive update aims to prevent potential issues related to the high-voltage battery's performance and longevity.

The Audi e-tron battery software update is crucial for maintaining the optimal function of the electric vehicle's battery system, ensuring proper cell balancing and voltage measurement.

Technical Background

The high-voltage battery system in Audi e-tron vehicles consists of numerous individual battery cells. These cells naturally have slight variations in capacity and voltage. To ensure the overall battery system operates efficiently and maintains its full capacity, a balancing function is essential. Without proper balancing, the system's capacity can be limited by the weakest cell, and individual cells may become overloaded or age prematurely.

This TSB, identified as 93N6, addresses a potential issue where an error in cell voltage measurement could affect the efficiency of this balancing function. The software update optimizes the control unit's function to stabilize cell voltage measurement and improve the battery balancing process.

Important Warnings for Owners

Owners should be aware of several critical points regarding this update:

• Prior Safety Recalls: All open safety recalls, particularly 93V2 or 93U9, must be completed before the 93N6 update. Failure to do so could erase historical high-voltage battery data, leading to inaccurate evaluation of battery cell modules.
• No Bluetooth/WiFi for Update: The software update procedure explicitly prohibits the use of Bluetooth or WiFi connections. Using these wireless methods increases the risk of connection loss, which could damage control modules. Warranty claims may be denied if the update is performed wirelessly.
• Radiator Fan Operation: During the update process, the radiator fan(s) may cycle on at high speed. Technicians are warned of a serious risk of personal injury from spinning fan blades, and hands and all objects must be kept away from the fans.
• Hazard Lights Required: The vehicle's hazard warning lights must be switched on during the update. Failure to do so may cause the procedure to cancel, as the hazard lights prevent the system from entering bus sleep mode.
• Warranty Reimbursement: A warranty claim for this update may not be reimbursed if the required SVM Process is not completed in its entirety, as this prevents the database from receiving the update confirmation response.

Repair Procedure Summary

The Audi e-tron battery software update involves a specific procedure performed by authorized Audi technicians using specialized diagnostic equipment. The process includes:

1. Preparation: Opening the vehicle's hood and battery cover. Connecting a battery charger (GRX3000VAS or equivalent) in power supply mode to maintain battery voltage above 12.5 volts throughout the procedure. Connecting the charger's negative cable to the chassis ground, not directly to the battery's negative terminal.
2. Diagnostic Tool Setup: Switching on the vehicle's hazard warning lights. Connecting a VAS6150X/VAS6160X Diagnostic Tester to the vehicle via a USB cable (Bluetooth or WiFi is prohibited). Starting the ODIS program and ensuring the ODIS software is up to date.
3. Software Flash: Navigating to the