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B0090 B0xxx · 车身（B） 高严重度
Restraint System Crash Sensor Fault
One of the impact sensors feeding the airbag ECU is out of range or not communicating. Deployment logic becomes unreliable.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Airbag lamp on
- Possible false deployment risk or no deployment
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed impact sensor
- 2 Corroded or damaged connector
- 3 Front-end damage not fully repaired
- 4 Wiring harness damage
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Inspect for previous accident damage first — a bent bracket or unrepaired harness is common.
- ✓ Read which sensor the ECU flags (front, side, satellite).
- ✓ Check the connector and mounting orientation; sensors are direction-sensitive.
- ✓ Compare sensor readings with key-on data.
维修方案
- Replace the impact sensor
- Repair the harness
- Repair any residual accident damage
B0090 —— 常见问题
Can the sensor be re-used after a crash? +
Manufacturer guidance is generally to replace impact sensors after a deployment. Follow the manual.
Does mounting direction matter? +
Yes — an incorrectly oriented sensor may not trigger in the intended impact type.