2003 E46 320d - 70 Fault Code - Occupancy Sensor - A Pillar Disturbed

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Thread: 2003 E46 320d - 70 Fault Code - Occupancy Sensor - A Pillar Disturbed

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  1. 2003 E46 320d - 70 Fault Code - Occupancy Sensor - A Pillar Disturbed 
    #1
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    Danw75's Car Details
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    Hi All, apologies for my first post being a request for help. I recently bought my first BMW after much searching, a 2003 320d Sport Touring and really love it. The only down side was the BMW Business CASSETTE player!! So I fitted a Blaupunkt DAB headunit with ipod connectivity etc, and removed the passenger a-pillar trim to fit the glass mount aerial as descreetly as possible. I removed fuses 7 and 41 to isolate any stereo power supply, and tip-toed around the curtain airbag running along the a-pillar, before routing around the back of the glovebox.

    I ran the DAB aerial lead and 12v power along with the other cables running down the pillar, and very very lightly lifted the base of the airbag to run the two cables behind the airbag should it ever be deployed.. Everything is now working as it should apart from if I have an airbag warning light illuminating (fault code 70, passenger occupancy sensor) when first started then goes off and intermittently comes back on again. This has been cleared then immediately comes back on.

    The standard remedy seems to be the sensor for the passenger seat or the mat for the same seat, but it does seem to be a bit of a coincidence that I was tinkering near the a-pillar airbag.

    Does anyone know of anything I could of inadvertantly disturbed along the a-pillar to flag the error? I also had the glove box out, but was very careful with all wiring apart from a bit of moving of wires around the climate control/headunit area to get the loom, aerial adaptor and modules for steering wheel controls and ipod adaptor out of the way.

    Really appreciate and advice and just want to fix it properly, I'm just suspicious that I've triggered something around that a-piller and would rather look there before investigating the passenger seat.

    Many thanks,

    Dan
     
     

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    #2
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    steve23002's Car Details
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    I would be looking at the seat sensor. There is nothing really in the A pillar that would trigger that fault. Seat sensors are a common E46 and E36 problem....
     
     

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    Danw75 (16-11-2011)

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    #3
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    Danw75's Car Details
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    Many thanks for the reply Steve, as far as I can make out, there is the mat within the seat and another sensor by the seat runner. If this is the case, is one more likely than the other to fail?

    Also, if I had the car checked on BMW diagnostics rather than the Snap-On tool which was used, do you know whether that would pin-point the fault more precisely?
     
     

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    #4
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    SlowTech's Car Details
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    Possibly disturbed the wiring to the seat belt pretensioner, I assume you slid the seat back to give you more room to access the glovebox?

    If so I had the same issue and fixed it with a cable tie http://www.bimmerforums.co.uk/forum/...or-now-t65413/
    the diag software screenshot in the link and what I used to pinpoint the fault was INPA
     
     

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    Danw75 (16-11-2011)

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    #5
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    Danw75's Car Details
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    Thanks SlowTech, will have a proper look around under the passenger seat on Saturday morning when I have some light!

    Dan
     
     

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    #6
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    joylove's Car Details
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    Duff connectors under the passenger seat. Worse case BMW sell repair kits that need soldering in to bypass the multiplug for about £15. Try to keep the cables the same length.
     
     

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    Danw75 (18-11-2011)

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