2021-2022 BMW X3 X4 Airbag Warning Light TSB
A technical service bulletin (TSB) addresses a common issue in 2021-2022 BMW X3 and X4 vehicles where a "check control message for the restraint system appears" and the "red air bag warning light lights up permanently" due to specific knee airbag fault codes.
David Chen2022 BMW X3
Also applies to
- BMW X3
- 2021
- BMW X4
- 2021–2022
Symptoms
Owners of 2021-2022 BMW X3 and X4 vehicles may notice a specific set of warnings related to the vehicle's restraint system. If your BMW X3 airbag warning light is illuminated, you will typically see a "check control message for the restraint system appears" in the instrument cluster.
Accompanying this message, the "red air bag warning light lights up permanently" on the dashboard. These indicators point to a potential problem within the airbag system, specifically concerning the knee airbags.
Fault Codes / DTCs
When a restraint system fault occurs, the Airbag Control Unit (ACSM) in affected BMW X3 and X4 models will store specific diagnostic trouble codes (DTCs). These codes help technicians pinpoint the exact nature of the problem. The following fault codes are associated with this issue:
| Code | Description |
|---|---|
| 930949 | Knee airbag, driver: short circuit to negative terminal |
| 93094F | Knee airbag, front passenger: short circuit to negative terminal |
| 93094C | Knee airbag driver's side: Resistance too great |
| 930952 | Knee airbag, front passenger: Resistance too great |
Diagnosis / Trigger Conditions
These fault codes indicate an electrical issue with either the driver's or front passenger's knee airbag. Code 930949 and 93094F suggest a short circuit to the negative terminal, meaning there's an unintended electrical path that could prevent the airbag from deploying correctly. Codes 93094C and 930952 point to an issue where the electrical resistance in the knee airbag circuit is too high, which can also impede proper function.
These conditions trigger the BMW X3 airbag warning light and the restraint system check control message to alert the driver to a potential safety concern. The underlying cause typically involves wiring, connectors, or the knee airbag module itself.
Owner Action
If you observe the "check control message for the restraint system appears" or the "red air bag warning light lights up permanently" in your 2021-2022 BMW X3 or X4, it is crucial to have your vehicle inspected by a qualified BMW service technician. An illuminated airbag warning light indicates a potential malfunction in a critical safety system.
Do not ignore the BMW X3 airbag warning light, as a compromised airbag system may not provide adequate protection in the event of a collision. Your dealer will be able to diagnose the specific fault code stored in the ACSM and perform the necessary repairs to resolve the issue.
Source: NHTSA Manufacturer Communication 10228440
Frequently Asked Questions
- What does it mean if my BMW X3 airbag warning light is on?
- If your BMW X3 airbag warning light is on, it indicates a detected fault within the vehicle's restraint system, specifically concerning the knee airbags. This is often accompanied by a 'check control message for the restraint system appears' in your instrument cluster.
- What are the common fault codes associated with the BMW X3 airbag warning light?
- Common fault codes for the BMW X3 airbag warning light include 930949 (driver's knee airbag short circuit), 93094F (passenger's knee airbag short circuit), 93094C (driver's knee airbag resistance too great), and 930952 (passenger's knee airbag resistance too great). These codes are stored in the Airbag Control Unit (ACSM).
- Is it safe to drive my 2021-2022 BMW X3 or X4 with the airbag warning light on?
- No, it is not recommended to drive with the airbag warning light on. An illuminated airbag light means the system may not function correctly in a collision, compromising your safety. You should have your vehicle inspected by a BMW service technician as soon as possible.
- How is the BMW X3 airbag warning light issue typically resolved?
- The issue is resolved by a BMW service technician diagnosing the specific fault code stored in the ACSM. Based on the code, they will identify and repair the underlying electrical problem, such as a short circuit or high resistance in the knee airbag's wiring or components.
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