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BEFORE doing any of my suggestions read up about working on the airbag system and DISSCONNECT the vehicle battery and go and have a cuppa while the system discharges. Airbags go off like an explosion and injury could occur. Moving on: Your fault is most likely a faulty passenger presence seat pad located inside the passenger seat. The pads degrade with age. It could also be simply a bad connection ot the pre-tensioner module. I've had both faults. Again disconnect the battery as the pretensioner is an explosive charge device. Get a cheap (tenner on ebay) OBD2 bluetooth diagnostic unit and download a free app such as Torque Lite. You can then interrogate the cars computer using your phone or tablet and read the fault codes. A garage will read them but charge you 30 quid upwards to read them. Youtube has info about a mod to avoid having to spend over 100 quid for a new seat mat. The Occupancy seat sensor is to prevent the passenger side airbag deploying in an accident if no passenger is present. The mod simply makes it always deploy. Oxidation of contacts in the connectors to any safety device can cause the car to log a fault code and show warning lights. Removal and reconnection of plugs and sockets can cure this poor connection. Again DISCONNECT the battery before working on the vehicle. YOU HAVE BEEN WARNED. You will then have to reset the fault codes stored before the airbag light will go off. This can be done using your phone or tablet with suitable software.
Your Airbag system is monitored by your vehicle's on-board diagnostic (OBDII) system. Although you may not see any visible defect, the system has identified a possible electrical or sensor fault and will have stored the appropriate fault code/s in its memory.
As your Airbag system is a critical safety feature, you will need to have these codes extracted by your local BMW dealership. The codes will immediately identify which component is at fault.
1st when the
airbag light is on the system is disabled, so if u have an accident
they will not work, as to the common cause read below. When
the airbag light is on it means a fault has occurred in the system
and the airbag diagnostic monitor has disabled the system, the most
common problem that turns the light on is a break in the connection
to the steering wheel mounted airbag, this is due to a rotating
ribbon contact that breaks under the steering wheel that connects the
airbag to the wiring harness and the diagnostic monitor, the part is
called th clock spring contact, a coiled up ribbon electrical contact
that turns with the wheel
you need the scanner to diagnose this problam if no scanner needed then it will be on http://www.vehix411.com all for free how to diagnose the airbag all in video and also how to reset it without a computer cheak it out it might help you
changing the module will not remedy the problem unless it is programmed. most likely if the control module had failed the fault stored in the airbag module should be a coding fault. Take the vehicle to your local bmw dealership, pay them to diagnose it and see if it just needs to be programmed. In most areas bmw dealership are opened on saturday usually fairly late
something in the airbag system is at fault. it could be the airbag(s) itself or any of the sensors that detect a crash to deploy the airbag. i would really take it into BMW and have it checked & repaired. the airbag(s) will not deploy with this light on so your safety is at risk if you are ever in an accident..
You need diagnostic software that can scan for BMW codes other than engine codes. This will tell you which airbag is triggering the fault light. If you have side airbags that are built into the seats, like I do on my Audi A4, you may have the same issue that I do with mine - moving the seat a little too far pulls on the airbag connector under the seat, separating it just enough to trip the fault light. I zip-tied mine tightly to keep it from separating, and then used the diagnostic computer to turn off the light. Most of the time an airbag light will not reset itself - it has to be manually turned off using a scanner or other interface software and a computer. If you don't have this, you'll probably have to pay someone to do it for you, but make sure to find the suspect bag first and see what you can do to keep it from triggering a light again.