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Service Bulletin

2021-2022 BMW X3/X4/X5/X6/X7 Mirror Display Fault

A technical service bulletin (TSB) addresses a mirror display fault in certain 2021-2022 BMW X series vehicles, leading to temporary loss of mirror display and several driving assistance functions due to an imprecise voltage measurement.

Byeditor david chen2022 BMW X3
2022 BMW X3 — BMW X3 mirror display fault
Editorial illustration generated for this article.
BMW X3 mirror display faultNHTSA 10227551Local Interconnect Network moduleexterior mirrors display faultLane Change Warning functionSide collision warningLane Change AssistantSteering and Lane Control AssistantEmergency Lane Assistant Hands Off 60 AssistantBMW X3 electrical system fault

Also applies to

BMW X3
2021
BMW X4
2021–2022
BMW X5
2021–2022
BMW X6
2021–2022
BMW X7
2021–2022

Symptoms of the BMW X3 Mirror Display Fault

Owners of affected 2021-2022 BMW X series vehicles may experience a temporary loss of the display in either exterior mirror during a driving cycle. This can also lead to the malfunction of several critical driving assistance functions. The primary symptom is the mirror display not working as expected.

Understanding the Cause: Semiconductor Supply Impact

The root cause of this issue is related to global semiconductor supply shortages. Due to these constraints, the Local Interconnect Network (LIN) module within the exterior mirrors was switched to an alternative controller. This new controller provides an imprecise voltage measurement. The main vehicle controller interprets this imprecise reading as a fault, leading to the observed symptoms.

Affected Driving Assistance Systems

When the mirror display fault occurs, it can impact various advanced driving assistance systems, especially those relying on the exterior mirrors. If your vehicle is equipped with these features, you may notice a loss of functionality for:

  • "Lane Change Warning function"
  • "Side collision warning"
  • "Lane Change Assistant"
  • "Steering and Lane Control Assistant"
  • "Emergency Lane Assistant Hands Off 60 Assistant"

These functions are crucial for vehicle safety and driver convenience, and their temporary loss can be concerning for owners.

What Owners Should Know

This technical service bulletin (TSB) highlights a known issue stemming from a supply chain change rather than a design flaw. If you experience the BMW X3 mirror display fault or any of the associated driving assistance system malfunctions, it's important to be aware of the underlying cause. While the document describes the problem, it does not detail a specific repair procedure for owners. If you are experiencing these symptoms, it is recommended to contact your authorized BMW dealer for diagnosis and potential resolution.

NHTSA Source Citation

This information is based on NHTSA Manufacturer Communication ID: 10227551.

Frequently Asked Questions

What is the BMW X3 mirror display fault?
The BMW X3 mirror display fault is an issue where the exterior mirror display and certain driving assistance functions may be temporarily lost due to an imprecise voltage measurement from a specific Local Interconnect Network (LIN) module.
Which BMW models are affected by this mirror display fault?
This issue affects 2021-2022 BMW X3, X4, X5, X6, and X7 models, as detailed in NHTSA Manufacturer Communication ID: 10227551.
What causes the mirror display fault in these BMW vehicles?
The fault stems from a change in the Local Interconnect Network (LIN) module in the exterior mirrors, necessitated by semiconductor supply shortages, leading to imprecise voltage readings that the main controller interprets as a fault.
What driving assistance features are impacted by this fault?
Features such as the "Lane Change Warning function," "Side collision warning," "Lane Change Assistant," "Steering and Lane Control Assistant," and "Emergency Lane Assistant Hands Off 60 Assistant" may be affected by this mirror display fault.
What should I do if my BMW experiences this mirror display fault?
If you experience the BMW X3 mirror display fault or related driving assistance system malfunctions, it is recommended to contact your authorized BMW dealer for diagnosis and potential resolution.

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