2021-2022 BMW 3 & 4 Series Restraint System Warning
Owners of 2021-2022 BMW 3 and 4 Series vehicles may experience a 'restraint system' check control message and a permanently lit red airbag warning light. This issue is often accompanied by specific knee airbag fault codes stored in the ACSM control unit.
Sarah Mitchell2021 BMW 430i
Si applica anche a
- BMW 330e
- 2021–2022
- BMW 330i
- 2021–2022
- BMW 430i
- 2022
- BMW i4
- 2022
- BMW M3
- 2021–2022
- BMW M340i
- 2021–2022
- BMW M4
- 2021–2022
- BMW M440i
- 2021–2022
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Symptoms of a BMW Restraint System Warning
Owners of certain 2021-2022 BMW 3 Series and 4 Series models may encounter a BMW restraint system warning message on their instrument cluster. This check control message is typically accompanied by the red airbag warning light illuminating permanently. These indicators point to a detected fault within the vehicle's restraint system, specifically related to the knee airbags.
Fault Codes / DTCs
When a BMW restraint system warning appears, diagnostic scans of the Airbag Control Unit (ACSM) are likely to reveal one or more of the following fault codes:
| Code | Description | Module |
|---|---|---|
| 930949 | Knee airbag, driver: short circuit to negative terminal | ACSM |
| 93094F | Knee airbag, front passenger: short circuit to negative terminal | ACSM |
| 93094C | Knee airbag driver's side: Resistance too great | ACSM |
| 930952 | Knee airbag, front passenger: Resistance too great | ACSM |
These codes specifically indicate electrical issues with either the driver's or front passenger's knee airbag, such as a short circuit or excessively high resistance.
Diagnosis and Trigger Conditions
The presence of these fault codes (930949, 93094F, 93094C, 930952) directly points to a malfunction within the knee airbag circuits. The Airbag Control Unit (ACSM) monitors these circuits for proper electrical values. When it detects an anomaly, such as a short to ground or an out-of-range resistance, it triggers the BMW restraint system warning and illuminates the airbag light to alert the driver to a potential safety concern.
What Owners Should Do
If your 2021-2022 BMW 3 Series or 4 Series displays a "restraint system" check control message or a continuously lit red airbag warning light, it is crucial to have the vehicle inspected by a qualified BMW service technician. These warnings indicate a potential compromise in the vehicle's safety system. The technician will perform a diagnostic scan to confirm the specific fault codes stored in the ACSM and determine the necessary repair.
Source: NHTSA Manufacturer Communication 10227929
Frequently Asked Questions
- What does the "restraint system" warning message indicate in my BMW?
- The "restraint system" warning, often accompanied by a permanently lit red airbag warning light, indicates a detected malfunction within your BMW's safety restraint system. This specific issue, as per NHTSA Manufacturer Communication 10227929, points to problems with the knee airbags.
- What specific fault codes are linked to the BMW restraint system warning?
- Diagnostic scans for this issue commonly reveal fault codes such as 930949 (driver's knee airbag short circuit), 93094F (front passenger's knee airbag short circuit), 93094C (driver's knee airbag resistance too great), or 930952 (front passenger's knee airbag resistance too great) stored in the Airbag Control Unit (ACSM).
- Is it safe to drive my BMW if the red airbag warning light is on?
- No, it is generally not recommended to drive your BMW with the red airbag warning light illuminated. This light indicates a fault in the airbag system, meaning that the airbags or other restraint components may not deploy correctly in the event of a collision, compromising occupant safety. You should have the vehicle inspected by a BMW service center as soon as possible.
- Which BMW models and years are affected by this knee airbag issue?
- This specific restraint system issue, detailed in NHTSA Manufacturer Communication 10227929, affects various 2021-2022 BMW models, including the 3 Series (330e, 330i, M3, M340i) and 4 Series (430i, M4, M440i), as well as the i4.
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