汽车故障代码B00722B怎么解决 “前排乘客”安全带锁扣紧急拉紧器内部故障 40% “前排乘客”安全带锁扣紧急拉紧器线路破损造成相互短路 30% “前排乘客”安全带锁扣紧急拉紧器插头内部相互短路 20% 气囊控制单元故障 10%