2004 E87 120d - Passenger seat heating issue

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  1. 2004 E87 120d - Passenger seat heating issue 
    #1
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    Chooch84's Car Details
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    Hi all,

    Recently I been stumped as to why my passenger seat didn't warm the backsides of the people who sit in the "hot seat", upon looking through the wiring diagram and checking all of the fuses inbetween, I found out that the seat didn't have the seat module fixed under the seat.

    I have purchased and fit this module, but now when I press the button to warm thee buttocks, the lights stay on for around 5-10 seconds then switch off. I can't figure out why that is. I don't think the module needs coding...as I wasn't advised at the time... but I could be wrong! Any suggestions?


    Chooch84
    Last edited by Chooch84; 06-05-2011 at 11:05.
     
     

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    #2
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    Can anyone assist the OP with this issue?
     
     

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    Chooch84 (24-05-2011)

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    Are your seats electric or manual with heating? If they are manual, you don't need the seat module as the heating signal is sent by the junction box module.
     
     

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    #4
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    The seats are manual, but with electric lumbar support. The heating on the driver side works fine. According to the WDS, it has a Junction box, and I have plugged in the 3 connectors to the module that fits under the seat. I have attached 2 wiring diagrams below. One with something called SMBF (A186), and the other without (A186a).

    Any suggestions?
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    The SMBF is the seat module for the passenger side (SMFA is the drivers seat module). As said above your car won't have either as it doesn't have electric seats so discard the wiring diagram with that on it.
    The module doesn't need coding.
    All E87's have a junction box (JBE), it's located under the glovebox. You can get at it by dropping the knee roll trim down. I'd check the lines between the JBE and the yellow connector under the seat and then between the yellow connector and the module.
    Check the plugs are ok and also none of the pins are bent/damaged.
    I had a problem like this and it turned out to be a bent pin in the yellow connector that someone else had damaged.

    Hi by the way, I'm new to the forum!
     
     

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    Chooch84 (25-05-2011)

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    #6
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    Welcome to the forum!

    Thank you for your help!!! I'll flip the seat back this weekend, and check to see what one was given to me, and I'll thoroughly inspect all pins and connectors!

    I'll be back...regarding this post...


    Chooch
     
     

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    Right I checked the pins...

    They're all fine. So I got the multi-meter out, and checked in-line with the Wiring diagram... all pins which should supply current work fine. Only one I couldn't check was the Bus pin as I don't have the know how on what kind of signal I should be seeing!

    I checked the Module part number and that was correct...

    Would a diagnostic check pick up what the problem could be, or would I be urinating in the wind?

    Cheers!


    Chooch84
     
     

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    #8
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    As it's winter.... can anyone help a brother out? Feeling guilty that I have my seat heater on but the passengers are still suffering!
    Last edited by Chooch84; 05-12-2011 at 18:12.
    Done: M Sport Kit, Angel Eyes, Tinted Rear LED Lamps, Remap, Exhaust, 130i front discs and calipers, VMR VB3 alloys, Eibach Pro-kit springs, Thermostat, Aux water pump, Rear View mirror replaced
    On the to do list: iPod Integration, ICE, replace passenger side door mirror, change passenger seat heating element ... Maybe sell the car
     
     

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