I had a heck of a time getting the car back together and running after, and in my misadventures I had to disconnect and reconnect the battery a few times. Last week I replaced the seals in the transmission between the mechatronic and the trans housing.

When you say pry up on the pins your talking about the pins on the actual female port on the positive terminal not the 2 wire connection coming from the car?īumping this thread because it just helped me. Yes this connector is VERY flimsy and I'm pulling my hair out trying to figure out the problem. Thank you very much for your in depth reply. This wire, as you probably already know, in case of an accident is used to fires up a pyrotechnic small device inside the BST which forces the positive battery cable out of the battery post connection (from outside would still look like connected though), and is meant to protect any fire. I read there is an option of tricking this by connecting a 2 ohm fuse at that wire and not connecting it to the BST, but I don't recommend it unless you can't fix it otherwise. I don't know if BMW sells that flimsy tiny connector alone. One other possibility wherever the other side of this cable is ending up (probably in the air bag central control system, don't know where it is, but could find it) has a loose connection, but that is low possibility, because you had the problem occur after battery replacement. The code is very descriptive in your and my case. This winter from cold looks like it again got lost its connection, I removed it again, cleaned both sides again with contact cleaner, pried up those things on the tiny connector and seated it back, cleared code and it hasn't came back again. I had cleaned the connector and made it seat well that time which was fine till this winter. Last year I had accidentally knocked this tiny thing off from the BST during battery replacement and once removed they get loose. Then pry up the two prongy things on the connector that is supposed to keep it tightly seated in its place. If it is connected remove it carefully, spray its pins and the pins on the connector on the BST side for it with a good electrical contact cleaner. In my case it was the later.įirst make sure you have this tiny wire is connected to the place on BST. The code means whether this connector is not placed back, or it is connected but not seated well and making good connection.

In addition to the thick red positive table, there is another thin two wire cable that gets connected to the BST. This is because of that tiny connector that goes into the BST (Battery safety terminal), which is the end section of the thick red positive cable that goes into the positive battery post.

I had this last winter after replacing battery, and this winter when it got cold.

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