2025 Audi Q5 Driver Assist Fault DTC B201000 TSB 2079136/1

Audi has released Technical Service Bulletin (TSB) 2079136/1 to address issues with various driver assist systems in certain 2025 Audi Q5 and SQ5 vehicles. Owners may experience warning messages in the instrument cluster and diagnostic trouble code (DTC) B201000 being logged. This TSB provides a clear solution for the 2025 Audi Q5 driver assist fault B201000.

Symptoms

Owners of affected 2025 Audi Q5 and SQ5 models may notice that several driver assist systems are unavailable. This unavailability can trigger specific warning messages in the instrument cluster, depending on the vehicle's equipment. These messages include:

• "Rear turn assist: fault. You can continue driving. See owner's manual"
• "Side assist: fault. You can continue driving. See owner's manual"
• "Exit warning system: fault. You can continue driving. See owner's manual"
• "Rear cross-traffic assist: fault. You can continue driving. See owner's manual"
• "Proactive occupant protection: currently restricted. See owner's manual"
• "Active front assist: currently unavailable. See owner's manual"

Fault Codes / DTCs

When these driver assist system malfunctions occur, a specific diagnostic trouble code is typically stored in the vehicle's memory. The primary DTC associated with this issue is B201000: No basic setting. This code may appear with either an "intermittent" or "static" storage state, indicating the nature of the fault. The event memory entry for this condition is often logged in the lane change assist control unit -J770- (diagnostic address 810B) and includes symptom number 1301.

Diagnosis / Trigger Conditions

The root cause of the 2025 Audi Q5 driver assist fault B201000 is identified as potential incorrect cable routing of the bumper wiring harness. This improper routing can cause the harness to obstruct the field of view of the sensor for the lane change assist control unit -J770-. When the sensor's view is blocked, it cannot function correctly, leading to the reported system failures and the logging of DTC B201000.

It's important to note that while this TSB focuses on cable routing, other complaints for DTC B201000 with symptom number 1301 might also be related to incorrect sensor installation or improper paintwork on the bumper, though these are independent of the specific issue addressed by this bulletin.

Repair Procedure Summary

The repair outlined in TSB 2079136/1 involves correcting the routing of the bumper wiring harness to ensure it does not obstruct the view of the lane change assist sensors. The general steps are as follows:

1. Remove the rear bumper cover: This provides access to the wiring harness and sensors.
2. Replace cable tie: Locate the existing cable tie with a terminal socket at the specified position. Remove it and replace it with a new cable tie, part number WHT001999. This new cable tie is designed to allow the cable to be rotated 90 degrees, facilitating easier and correct routing.
3. Re-route the bumper wiring harness: Ensure the harness is routed below the lane change assist control unit 2 J770, clearing the sensor's field of view.
4. Adjust grommet orientation: Turn the bumper wiring harness grommet downwards into the 6 o'clock position. This adjustment helps maintain proper cable positioning.
5. Install the rear bumper cover: Reinstall the bumper cover once the harness routing is corrected.
6. Perform dynamic calibration: After the physical repair, a dynamic calibration of the two rear lane change assist control units (-J769-/-J770-, diagnostic addresses 810B/810C) is required to ensure proper system functionality.

Required Parts

To perform this repair, the following part is required:

• WHT001999: Cable tie with terminal socket (Quantity: 1)

Warranty Information

For warranty claims related to this issue, the following details apply:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is for informational purposes only.
• Service Number: 9759
• Damage Code: 0029
• Labor Operations:
  • Remove and install bumper cover: 6369 1900
  • Modify bumper wiring harness: 9759 4999 (10 TU)
  • Adjust lane change assist control unit: 9635 1552
  • GFF / Guided Functions: 0150 0060 (Time stated on the diagnostic protocol)

All warranty claims must comply with the Audi Warranty Policies and Procedures Manual and are subject to review by Audi Warranty.

What Owners Should Know

If you are experiencing a 2025 Audi Q5 driver assist fault B201000 or any of the listed warning messages, it is recommended to visit an authorized Audi service center. They can diagnose the issue, confirm if TSB 2079136/1 applies to your vehicle, and perform the necessary repair to restore full functionality to your driver assist systems.

NHTSA ID: 11023791