Installation instructions – BST emulator

Battery Safety Terminal emulator

The emulator should be connected in place of the battery safety terminal (BST). It can be found next to the battery in the trunk.

1. Turn the ignition off.

2. Find the cable connecting the BST with the car’s installation.

3. Connect the emulator with the car’s installation. To do this, cut the wire connecting the BST with the car’s installation and connect the emulator in place of the BST. Please pay attention during assembly to connect the emulator to the car’s installation and not to the BST. To connect the emulator, you can use little clamp connectors attached to the emulator or solder the wires.

Installation using clamp connectors


The cable connecting the BST to the installation of the car.



The above pictures show the access to the BST connector. Click on the selected photo to enlarge it.

The picture shows BST wires
- blue and brown - to which the emulator should be connected.
The order of connecting the BST emulator wires does not matter.
Click on the picture to enlarge it.

BMW X3 E53, USA version

BST plug. Cut the two black wires shown in the picture and connect the emulator towards the car installation.

The emulator is a diagnostic device, it is used for diagnostic purposes and should not be permanently mounted.

It can be used on all BMW models with a damaged battery safety terminal (BST).

The device sends information to the car computer that the BST works correctly.

After the installation, it is needed to reset the code using diagnostic software.

This device does not affect other components of the SRS system. In case of a collision, all correctly functioning airbags will be deployed if needed.
Warning! The BST bypassed with the emulator will not work!

The emulator can be used in any BMW model. The photos above were taken on the BMW E60 and BMW E46. Please remember that in other cars it may look slightly different.

Installation should be carried out by a professional mechanic who is knowledgeable in the SRS system. We can share our knowledge and experience with you, but if the problem is more complicated, we will be able to help if the person has the appropriate knowledge. If you have questions please contact us, attached photos appreciated.