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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 11-15-2009, 11:42 AM   #1 (permalink)
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318iS Airbag light comes on and off when i have a passenger?

Hello all hope you can help, i have looked on here but cant find a problem the same.
I have a 2003 318i sport touring, when its just me in the car all is fine but when i have a passenger the airbag light sometimes comes on but will go off and come on when it feels like it.

Any ideas, Many thanks
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Old 11-15-2009, 11:55 PM   #2 (permalink)
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maybe a loose/shorting connector under the seat for either the occupancy sensor or the seat belt tensioning device.... You got anything trapped under the seat?
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Old 11-18-2009, 06:47 AM   #3 (permalink)
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There are 3 items that could be your culprit, Occupancy sensor $23.00 on ebay, the seat belt buckle maybe $76.00 and the most terrible on is the mat sensor,not too easy to get it out, the dearler will charge more then $300.00 to replace it or look for some treads on how to replace it if all else fail...since it is intermittent you know is a short somewhere base on what you wrote, weight onthe pass seat might bite some wire and causing a short...
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Old 11-19-2009, 08:08 AM   #4 (permalink)
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I would think it was the occupant sensor first and for most. I had this issue on another one of my cars and that was the issue. I never fixed it because I never have passengers in that car.
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Old 11-20-2009, 03:16 AM   #5 (permalink)
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Thanks all, will take the seat out and have a look. If i unplug the seat to remove it and plug it back in will the light stay on?

Cheers
Rich
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Old 11-20-2009, 09:34 AM   #6 (permalink)
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Disconnect the battery before you pull the seat out........if your radio needs a code make sure you have in case its required on reconnection.
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Old 08-16-2010, 09:36 AM   #7 (permalink)
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Smile Passenger Occupancy Sensor

I had a similar problem in that my airbag light came on for no reason. Turned out it was my Passenger Seat Occupancy Sensor. This is a mat embedded in the seat and if it goes bad, then the airbag light will come on and all airbags are disabled (potentially). I got mine fixed by substituting this sensor with a bypass unit which simulates a passenger all the time. Check out the website:
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Old 09-03-2010, 05:56 PM   #8 (permalink)
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E46 Airbag light

Here is a link to a module sold on ebay

BMW E46 E39 E38 E36 Z3 Airbag Sensor Bypass Unit on eBay (end time 01-Oct-10 13:57:22 BST)
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