How to install BMW positive battery safety terminal kit Also, the replacement can be done by yourself or you can take it to the professional mechanic to perform this replacement. You can either buy a new clamp (bmw Auto Cable Masevaux) battery terminal cable with pyroswitch which is a bit costly option or just replace pyrofuse which is a cost effective option and save you a lot of money. The only solution for a bad BST is the replacement. How to fix bad BMW battery safety terminal BMW doesn’t start but accessories and light works.Your BMW is not starting after an accident.If you find it loosed, it means that BST ignited and disconnected the positive terminal which is hampering the ignition of your BMW. If you are unable to start your BMW, make sure that you checked the positive cable of battery is not loose. In this guide, we will see how to install a BMW battery safety terminal kit and reset BMW air bag light which comes ON when the BST sensor fails. ![]() Once the BST is ignited it may not be reused and needs to be replaced. ![]() When BST sensor fails, it triggers the airbag light to come ON. It performs a vital function for the overall functionality and safety of the BMW battery. The actual reason for this problem is the BMW battery safety terminal (BST) sensor fault, which is mounted on the positive terminal (also known as the pyroswitch/pyrofuse) as part of the battery positive clamp that attaches to the battery post and in an event of accident BST triggers and disconnects the B+ cable going to the starter and alternator.īattery safety terminal as the name implies, is designed to disconnect the battery when the car is involved in an accident. This usually occurs when a vehicle has faced an accident and resultantly the battery positive terminal explodes to prevent the car from further damage. Difficulty starting the vehicle after an accident is one of the first symptoms of a problem with the battery terminals or loss of electrical power.
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