E46 2005 convertible heated seat problem

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  1. E46 2005 convertible heated seat problem 
    #1
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    BennyboyE46's Car Details
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    Good evening all,

    For a while now both front seats do not seem to heat up as much as they used to. There are no 'hot spots' just in general do not get as warm as they were before. Any ideas? Could it be anything to so with the seats memory? Any way of adjusting the heat (other then the obvious led button)
    Just had the car in the garage for a service and the mechanic said the car is faultless (all that was noted was tyre on the limit)

    The car is a 318 ci sport convertible 2005

    Any help much appreciated.

    Thanks

    Ben
     
     

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    #2
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    gunslinger1's Car Details
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    hi , first off , i dont think its a fault with the seat memory as this does not control seat heating , and there is no way of adjusting the max temp of the seat other than the button as you rightly say . with the problem being on both seats , i would suspect a common cause .have you checked the voltage to both the heating elements in the seats ? , i have known little electrical box under both front seats to cause problems , but in this case i would not be sure that this is the fault with your car .
     
     

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    #3
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    BennyboyE46's Car Details
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    I haven't checked to be honest electrics are not really my thing but I will get a auto electrician to have a look. Could the elements possibly be on there way out?
     
     

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    #4
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    hi the elements could be past there best and well get weeker with age , but if they work at the moment i would be temped to leave them untill one or both pack in , its much easer to find the fault and cuts out fitting unnesseary parts and guessing the fault . but thats just my opinion
     
     

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    #5
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    Ok mate thanks is it true that to replace them the whole seats need to be replaced? Maybe it's just me thinking there not as hot with the cold weather recently
     
     

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    #6
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    to replace the heating elements mate , you will have to remove the seat , i am sure on your seat the elements can be replaced , but you will have to remove the seat covers / trim ,and then remove the heating elements .
     
     

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    #7
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    Ok mate hopefully it won't come to that but ill see how it goes!! Thanks for your help mate
     
     

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    Not sure about seats other than leather ones. For both non-sport & sport leather seats on the E46 Convertible (and - so far as I know - Coupe) the seat heater pads are sewn onto the leather covers and are not available from BMW. Replacement leather seat covers seem to come as standard with the seat heater elements sewn, in. However, are eye-wateringly expensive. And if your car was purchased with leather seats but no seat heatres, it does not have seat heaters fitted but not wired in ! I know because I had my seat covers removed to check.

    A couple of other important points (based on personal experience):

    (a) the BMW OEM seat heater pads are controlled by electronics in the switch unit. The OEM pads incorporate a 10 K ohm negative temperature coefficient thermistor between the live
    and neutral (earth) wires (I think on the seat base pad only). I can explain what this is if anyone cares ! This provides a temperature variable link to ground. If this is not present. the electronics sense this and immediatelt disengage the switch (if an attempt is made to switch on the seat heaters).

    (b) I had E39 seat heaters fitted to my E46 M3 Convertible by a knowledgeable BMW Independant. I can't remember whether Sport or non-Sport. Apparently, they are virtually
    identical to the E46 sewn-in ones. Of course, if you choose to copy this, it will be at your risk i.e. I take no responsibility if something goes wrong etc. etc.

    Good luck.
     
     

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    #9
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    Thanks mate for that. So if i get a auto electrician to have a look it could possibly be a loose wire? It's a m sport with leather seats so I guess yeah sports seats.
     
     

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