R50/53 R53 1 issue after another
All of the codes that I have gotten I belive are the BMW codes. I have looked up I belive most if not all codes and they point to a Dynamic Stability Control or a Battery Safety Terminal. I have gotten some one that I had talked to saying I should go over my grounds and check my battery. So this weekend that is what i am going to chance
Does the car not start???
Turn over/crank?
Click?
Can you hear the fuel pump vibrating before trying to start the engine?
**Is the airbag light illuminated?
....
Try erasing the codes and then scan again to see which ones come back/show up.
Turn over/crank?
Click?
Can you hear the fuel pump vibrating before trying to start the engine?
**Is the airbag light illuminated?
....
Try erasing the codes and then scan again to see which ones come back/show up.
Last edited by Here2Go; Apr 7, 2026 at 03:19 PM.
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Since your airbag light is on / The car cranks but doesn't start - It could/might be that your BST (Battery Safety Terminal) has blown. Or partially blown (?).
If completely blown - the car normally won't crank since the detonator will disconnect the battery from the car.
If it is partially blown ; Sometimes you'll have battery power to the car but the airbag light will be lit on the speedo without having been in a collision.
In which case there is a simple inexpensive fix as discussed here on the NAM forums:
Airbag Code 11 (battery squib) repair and light reset
The discussion continues here with some pics.
Now, This might not be the primary cause of the issues your having - but if the airbag light is on (without having been in a collision), and the BST had NOT detonated; this may save you a trip to the dealer...or if your OBD lacks the function of turning the airbag light off.
This is just my thought having had a similar experience years ago.
Keep us posted.
If completely blown - the car normally won't crank since the detonator will disconnect the battery from the car.
If it is partially blown ; Sometimes you'll have battery power to the car but the airbag light will be lit on the speedo without having been in a collision.
In which case there is a simple inexpensive fix as discussed here on the NAM forums:
Airbag Code 11 (battery squib) repair and light reset
The discussion continues here with some pics.
Now, This might not be the primary cause of the issues your having - but if the airbag light is on (without having been in a collision), and the BST had NOT detonated; this may save you a trip to the dealer...or if your OBD lacks the function of turning the airbag light off.
This is just my thought having had a similar experience years ago.
Keep us posted.
Last edited by Here2Go; Apr 11, 2026 at 12:50 PM. Reason: Correction: "had NOT detonated" = missed word 'NOT'
^^^ - Absolutely Correct - ^^^
My BST had partially blown Seperated. Airbag light on. Pushed the BST detonator "squib" back together. Car would then crank consistently (rather than intermittent). Airbag light still on for months until I came across the airbag light resistor fix.
My BST had partially
Last edited by Here2Go; Apr 8, 2026 at 09:12 AM. Reason: Corrected verbage - Separated : Squib
All of the codes that I have gotten I belive are the BMW codes. I have looked up I belive most if not all codes and they point to a Dynamic Stability Control or a Battery Safety Terminal. I have gotten some one that I had talked to saying I should go over my grounds and check my battery. So this weekend that is what i am going to chance
bmw codes, like these: https://www.scribd.com/document/7719...MW-Error-Codes
If it got those three than the only other option is compression. Without compression no start but it seems unlikely that all four cylinders have no/low compression.
Just another (perhaps silly) thought -
How fresh is the fuel? - i.e:
When or how long has the car been sitting or when last driven?
If somewhat recently; you might check the fuel pressure at the rail....
unrelated to the fault codes: clogged fuel filter?
How fresh is the fuel? - i.e:
When or how long has the car been sitting or when last driven?
If somewhat recently; you might check the fuel pressure at the rail....
unrelated to the fault codes: clogged fuel filter?
It doesn't look bad here
But in this picture there is a plug taped to the positive wire and nothing around it to plug into it
Gas is only few months old. I drained it about 3 months ago and put fresh gas in just before I replaced the fuel pump and both filters. I did look at BST and looks intact but there is a random wire that comes of of it and has a plug on the end and nothing plugged into it
Well, I was hoping to get to my laptop to draw/ indicate what I thought might be a slight breech in the black plastic casing that houses the BST/detonator in the second pic of your post#16. That black plastic cylindrical thing.
Like I'd mentioned in my scenario (occurred years ago)...
the large positive cable going into the squib/ BST/cylinder somehow was pulled and pulled the end of the metal end of the cable away from the inside of the "explosive" end of the detonator ....sufficed to say ; My BST did not detonate. The 2 contact points were pulled apart and barely making contact completing the circuit....
I'm not suggesting that is the same in your case.... I just find it interesting.
But in your recent post showing the latest fault codes - I did see one that piqued my curiosity enough to Google it.
I can't say that I've ever encountered a BMW fault code as:
"0B battery positive terminal isolation 1"....here is what turned up in the search (if you haven't already searched):
google/:
Fault code 0B (or 0B MRS: Battery, positive terminal isolation 1) usually indicates a blown Battery Safety Terminal (BST) on BMW/Mini vehicles, commonly caused by a minor accident, curb strike, or voltage issue. This pyrotechnic device disconnects the positive cable, causing a no-start or airbag light. Repair requires replacing the cable or bypassing the sensor with a 2-ohm resistor.
Key Diagnostic and Fix Steps:
google\:
While I am not insisting and don't mean to belabor the possibility of BST as being the fault for your no start condition...I am truly curious why that fault code keeps popping up....Perhaps it is merely just the airbag light/fault?
Like I'd mentioned in my scenario (occurred years ago)...
the large positive cable going into the squib/ BST/cylinder somehow was pulled and pulled the end of the metal end of the cable away from the inside of the "explosive" end of the detonator ....sufficed to say ; My BST did not detonate. The 2 contact points were pulled apart and barely making contact completing the circuit....
I'm not suggesting that is the same in your case.... I just find it interesting.
But in your recent post showing the latest fault codes - I did see one that piqued my curiosity enough to Google it.
I can't say that I've ever encountered a BMW fault code as:
"0B battery positive terminal isolation 1"....here is what turned up in the search (if you haven't already searched):
google/:
Fault code 0B (or 0B MRS: Battery, positive terminal isolation 1) usually indicates a blown Battery Safety Terminal (BST) on BMW/Mini vehicles, commonly caused by a minor accident, curb strike, or voltage issue. This pyrotechnic device disconnects the positive cable, causing a no-start or airbag light. Repair requires replacing the cable or bypassing the sensor with a 2-ohm resistor.
Key Diagnostic and Fix Steps:
- Check the BST: Look for a yellow connector and a small, damaged/disconnected cylinder on the positive battery cable.
- Check for 2-ohm resistance: Use a multimeter to check the resistance of the yellow plug's two pins to determine if the sensor is intact or blown.
- Temporary Fix/Reset: Ensure the yellow plug is securely connected. In some cases, resetting the airbag light with specialized tools (like BMW-specific scanners) can clear the code.
- Permanent Repair: Replace the positive cable assembly (BST) or, if the sensor is okay, clean the connector and tighten the terminal connection.
- Clear the Codes: The airbag light code must be cleared using a capable diagnostic tool, as it is a permanent code. ,
google\:
While I am not insisting and don't mean to belabor the possibility of BST as being the fault for your no start condition...I am truly curious why that fault code keeps popping up....Perhaps it is merely just the airbag light/fault?
"Check the BST: Look for a yellow connector and a small, damaged/disconnected cylinder on the positive battery cable."
i think op's yellow connector is not plugged in.
sorry did not get a chance to look at mine last night. going to try again tonight
i think op's yellow connector is not plugged in.
sorry did not get a chance to look at mine last night. going to try again tonight







