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对于装备EWS 2、EWS 3防盗控制单元(图1)的宝马520、528、530、728、740、750和X5车,钥匙(图1)数据丢失是非常常见的故障之一,一般情况下,在下列几种情况下容易出现钥匙数据丢失的故障。(1)当蓄电池电压低于9V时,用钥匙连续起动车辆3次都不能着机,然后就再也不能起动车辆了。(2)在车辆蓄电池电量不足的情况下,采用外加电源充电时如果起动车辆,蓄电池夹接触不良容易造成钥匙数据丢失。应该充电10min以后再起动车辆。(3)很多维修技术人员修车时习惯将钥匙插在点火开关内,如果钥匙插入点火开关长时间不起动车辆,车门打开门灯常亮,蓄电池电量会慢慢耗损,蓄电池电压低于9V是最容易造成钥匙数据丢失的。这是因为使用EWS 2和EWS 3防盗控制单元的宝马车型,当钥匙插入点火开关时就开始通
For the BMW 520, 528, 530, 728, 740, 750 and X5 vehicles equipped with the EWS 2 and EWS 3 immobilizer units (Figure 1), data loss of the keys (Figure 1) is one of the most common failures and, in general, In the following situations prone to loss of key data failure. (1) When the battery voltage is lower than 9V, the vehicle can not be started up continuously with the key for 3 times, and then the vehicle can not be started anymore. (2) In the case of insufficient battery power of the vehicle, if the starting vehicle is charged with an external power supply, poor contact of the battery clip may easily result in the loss of the key data. It should be charged 10min before starting the vehicle. (3) Many maintenance technicians used to insert the key into the ignition switch while repairing the vehicle. If the key is inserted into the ignition switch for a long time and can not start the vehicle, the door open door light is always on, the battery power will be consumed slowly, and the battery voltage is below 9V The most likely to cause the loss of key data. This is because BMW models that use the EWS 2 and EWS 3 immobilizer units start when the key is inserted into the ignition