BMW B+ BST Battery Safety Terminal How To DIY Replace - 3 series 5 series Z4M E85 E86 X1 X3 X5
How to Replace BMW B+ BST Battery Safety Terminal on ANY BMW such as 3 series 5 series Z4M E85 E86 X1 X3 X5
If your BMW won’t start after an accident or after a minor “bump” event, such as hitting a kerb, then there is a good chance that the battery safety terminal that is fitted onto the B+ positive terminal of your battery has triggered.
Of course, if a BMW DTC code has been triggered, which has resulted in the SRS airbag warning light coming on, then this will be clear.
I highly recommend the Creator C110+ Fault Code Reader for clearing your BMW airbag light (Once you have fixed the fault) – Costs $45 / £48 and will SAVE you that much the first time you use it!
BUT in many cases, even when an airbag light hasn’t come on, it is still possible that the BST has blown.
IN THIS VIDEO – I will go through the symptoms of a blown BST and show you how to check yours, so that you can be sure that it has activated. I will then cover two possible fixes!
1) How to do a Temporary “Get you home fix”
2) How to replace the BST with a good condition used part and save yourself money!
In this video, the car featured was a BMW Z4M coupe E86. However, this information should be relevant for the following cars (probably plus many more too!), your battery may just be in a different location and the shape of your positive battery terminal connection may look slightly different.
BMW 3 series E46 and E90
BMW 5 series E60 and F10
BMW 6 series E63 and E64
BMW Z4 E86, E86 and E89
BMW 1 series E82 and E88
BMW X1 E84, X3 E83, X5 E70 and X6 E71
PLEASE NOTE: For the permanent fix mentioned above, especially if your airbag light is on, you really need to check the SRS system using a diagnostic tool such as BMW V57 DIS software or a BMW specific fault code reader. There is a chance that the trigger signal is still in place (for example from the front bumper) and if you replace the BST, it might just blow again. If your airbag light isn’t on then the chances are good that the BST blew due to a one-off trigger, therefore you SHOULD be able to go ahead and replace it but I STILL highly recommend that you check for codes first.
I have two videos available to help with this:
💡 Read check erase codes with BMW DIS V57 Software -
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In this guide I will cover the following:
00:00 Intro to How to fix BMW B+ Battery Safety Terminal on 3 series 5 series Z4m E86
00:16 What are BMW BST Symptoms
00:25 BMW Z4 SRS system sensor locations
01:00 BMW BST Location
01:10 BMW Positive Battery Cable
01:21 How to Check a BST
02:00 BST bypass
02:11 Remove negative battery terminal first
02:21 BST temporary Repair
03:15 How to replace a BST
03:53 Blow Pyro on BST
04:04 What a good Pyro on a BST looks like
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BMW B+ BST (Battery Safety Terminal) How To DIY Repair - 3 series 5 series Z4M E85 E86 X1 X3 X5
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DISCLAIMER: Please note that this video and its content is intended for information purposes only. Although every effort is made to ensure that all the information is correct, there is no guarantee that this is the case. This video should not be considered a substitute for seeking independent advice or the services of a professional. Any work that you carry out on your vehicle or vehicles in your care are at your own risk.