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故障现象很多奔驰S500车(W220车型,图1),在汽车美容店进行清洁或者洗车之后经常出现所有门窗玻璃不能升降的故障,经检查门窗玻璃升降的熔丝并没有熔断,这种故障的出现,多数情况下是座椅控制单元损坏导致的。故障原因出现上述故障的原因是,在洗车时,用湿毛巾在室内擦洗玻璃时,水顺着玻璃(图2)流入了座椅控制单元(图3)内。因为洗车的液体一般都带有很强的腐蚀性,而座椅控制单元是带常电并通过CAN系统的网关控制工作
Symptoms A lot of Mercedes-Benz S500 cars (W220 models, Figure 1), in the car beauty shop cleaning or car wash after all the doors and windows can not be up and down the failure of the inspection door and window glass fuse has not blown, this failure , In most cases is caused by damage to the seat control unit. PROBLEM CAUSES The cause of the above malfunction is that water flows into the seat control unit (Fig. 3) along the glass (Fig. 2) while wiping the glass in a room with a wet towel while washing the car. Because the liquid is generally washed with a strong corrosive, and seat control unit is normally energized and gateway control work through the CAN system