汽车故障代码B007012怎么解决 “驾驶员”安全带锁扣紧急拉紧器内部故障 40% “驾驶员”安全带锁扣紧急拉紧器线路破损造成对正极短路 30% “驾驶员”安全带锁扣紧急拉紧器插头内部对正极短路 20% 气囊控制单元故障 10%