BMW battery safety terminal
Hey guys have a 2013 Bmw 335xi coupe, body shop car multiple airbags deployed all replaced recently. Only code that is left is a 93B2 for battery safety terminal. From my research it looks like this is a basic squib circuit 2 wire in the event of an accident it blows and disconnects part of the positive battery cable. The battery safety terminal has been replaced with factory bmw part and the body shop has tried one off of a known good car. Code will not clear. I found the connector is damaged but still seems to be making connection and have one on the way but I am not confident it will fix this car. I put a resistor in place of safety terminal and the voltage below is what I see on either wire. So I don’t believe this is a wiring issue.
I have tried shorting this connector as well and the code never changes. The shorting bar is on the battery safety terminal and is intact. Tried two different scan tools (both snap on starting to wonder if the scan tools are letting me down on this one) neither will clear code.
Looking for some direction on this any help would be appreciated. Thanks Tyler
In my experience,it is quite often the connector you are holding on the third picture. The tabs that open the “bridge circuit” at the BSD melts or it’s missing.
That connector is damaged for sure. I guess I’ll know for sure when the new one gets here. I’m just concerned that when I put a resistor on the pins in that connector my code does not go away. Do you have a source for these connectors? Or getting them from dealer
Tyler, Check to be sure the connector is not shorting out when connected. That condition is common and will give you that code. -Charlie
Will do thanks Charlie appreciate the help!
Wondering if the Airbag control module was replaced? If so has it been coded / programmed yet? What scanner are you using to clear the codes? You may need an Autel, Autoland or Autologic to clear the codes.
I will find this out good question. I tried with snap on verus and Solus.
Tyler, The connector tabs push on the shorting bridge inside the BST. Without this disconnection, the airbag module sees a lower resistance than needed to clear the code. Replace the connector which should fix your issue. BMW sells a repair kit which comes with a connector, pins, and wiring.
You wouldn’t have a part number for that would you. My local dealer is not able to find one.
Should be this one . ecstuning.com/b-genuine-bmw…
I came up with … I don’t have any experience with those diagnostic tools but keep in mind , that’s a propietary and complex system on top of being a safety related system and repair. Quite easy for somebody to throw one under the bus if something goes sideways.
Yup for sure Mickey. I try and do the best with what the shop has for equipment and I know when to send it away. With the amount of body repairs and airbags components that were done on this vehicle and with a rebuilt title. There would be a long list of people under that bus lol. But you are 100% correct Thanks for the help
That connector should fix your fault..
It is most probably the connector. The locking tab when locked in place will cover the connector pins. If you see any of the metal connector pins exposed, the plastic tabs will not lift the shorting bars in the BST and will still be in contact with the pins. You do not say what the value of the resistor you used for testing is. BMW's are normally a two or three ohm resistance on all air bags…