寶馬車娛樂系統采用的是MOST環形結構，需要特別提出來的是F系列與E系列娛樂系統進行改變，將網關ZGW、組合儀表也納入到娛樂系統，網關與其他部件的信息傳遞也采用光纖方式，E系列的車型主機與網關之間的通信是采用KCAN總線方式傳遞數據，在此主機也扮演者娛樂系統網關的角色，那么即使MOST光纖系統斷路，主機及CID還是能夠正常工作。F系列如果有一個部件出現問題則整個系統將處于癱瘓狀態。對應此車故障應該是其中的某個部件不能夠正常工作所致。

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.

為什么啟動機也不運轉，基于目前的情況啟動機自身出現問題的可能性很小。為了確保一定沒有問題，還是測量了啟動機的控制線，結果在按壓啟動按鈕的時候沒有信號出來。

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.

要達到什么樣的條件啟動機才能夠運轉呢？

What conditions should be met before the starter can run?

一，鑰匙數據合法性（防盜能夠解除）

1、 Key data legitimacy (anti theft can be removed)

二，制動信號的有 效傳遞

2、 Effective transmission of brake signal

三，變速器擋位在N或者P擋

3、 The transmission is in N or P gear

查閱電路圖（如圖所示），啟機是由CAS（便捷進入及啟動控制模塊）控制，那么這3個信號一定要真實有 效地傳遞到CAS里面，它才會控制啟動機運轉。燈光能夠正常打開，制動燈也能夠點亮，說明這兩個信號CAS已經接收到。

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.