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B0020 B0xxx · 车身（B） 高严重度
Left Side Airbag Deployment Control
Fault in the left-side airbag or curtain deployment loop. Usually the connector under the seat or in the door pillar.
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
- Side impact protection disabled
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Connector under the seat disturbed or corroded
- 2 Open wiring in the door-pillar harness
- 3 Faulty side airbag unit
- 4 Water ingress
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。
- ✓ Disconnect and wait per the safety procedure before touching connectors.
- ✓ Inspect the seat harness connector first — seat movement is a common cause.
- ✓ Read loop resistance from the airbag module.
- ✓ Check for water ingress in the footwell or pillar.
维修方案
- Re-seat or repair the seat connector
- Repair the pillar wiring
- Replace the side airbag unit
B0020 —— 常见问题
It started after I moved the seat — why? +
The connector under the seat is strain-limited. Moving the seat fully forward or back can pull it loose.
Is a side airbag cheaper to fix? +
Usually, because the fault is nearly always the connector rather than the airbag itself.