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國外論壇找到的
Q
car year: 2006
car model: 325i
I had my battery (Interstate) replaced at Firestone and I noticed the Bit Serial Data Interface wire was not connected. Where is this supposed to be attached?
A
The BSD wire harness should be permanently affixed to the IBS (Intelligent Battery Sensor) at the negative battery cable. The wire will have a small harness plug that is connected to the corresponding harness plug which leads to the ECM (Engine Control Module). So, if the harness plug is disconnected, you need to find the corresponding plug which should be somewhere in the area. If the wire itself is disconnected from the IBS unit, it has been broken and the battery installer should be responsible for this. The fix is to replace the negative battery cable assembly.
問題可大可小，文中有提到可以檢查電池端的BSD接頭是否有接好，若接頭都有正確連接還是出現錯誤則必須更換BSD線組
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