宝马车娱乐系统采用的是MOST环形结构，需要特别提出来的是F系列与E系列娱乐系统进行改变，将网关ZGW、组合仪表也纳入到娱乐系统，网关与其他部件的信息传递也采用光纤方式，E系列的车型主机与网关之间的通信是采用KCAN总线方式传递数据，在此主机也扮演者娱乐系统网关的角色，那么即使MOST光纤系统断路，主机及CID还是能够正常工作。F系列如果有一个部件出现问题则整个系统将处于瘫痪状态。对应此车故障应该是其中的某个部件不能够正常工作所致。
BMW's entertainment system adopts the most ring structure. What needs to be specially mentioned is that the F-series and E-Series entertainment systems should be changed. The gateway zgw and combination instrument are also included in the entertainment system. The information transmission between the gateway and other components also adopts the optical fiber mode. The communication between the E-Series vehicle host and the gateway adopts the kcan bus mode to transmit data, The host also plays the role of entertainment system gateway, so even if the most optical fiber system is open circuit, the host and CID can work normally. If one part of F series has a problem, the whole system will be paralyzed. Corresponding to this car failure should be one of the components can not work normally.
为什么启动机也不运转，基于目前的情况启动机自身出现问题的可能性很小。为了确保一定没有问题，还是测量了启动机的控制线，结果在按压启动按钮的时候没有信号出来。
Why the starter is not running, based on the current situation, the possibility of problems in the starter itself is very small. In order to ensure that there must be no problem, the control line of the starter was measured. As a result, no signal came out when the start button was pressed.
要达到什么样的条件启动机才能够运转呢？
What conditions should be met before the starter can run?
一，钥匙数据合法性（防盗能够解除）
1、 Key data legitimacy (anti theft can be removed)
二，制动信号的有 效传递
2、 Effective transmission of brake signal
三，变速器挡位在N或者P挡
3、 The transmission is in N or P gear
查阅电路图（如图所示），启机是由CAS（便捷进入及启动控制模块）控制，那么这3个信号一定要真实有 效地传递到CAS里面，它才会控制启动机运转。灯光能够正常打开，制动灯也能够点亮，说明这两个信号CAS已经接收到。
Refer to the circuit diagram (as shown in the figure), the startup is controlled by CAS (convenient access and startup control module), then these three signals must be truly and effectively transmitted to CAS, it will control the operation of the starter. The light can be turned on normally and the brake light can also be turned on, indicating that the CAS has received the two signals.
