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seat heater wont switch off?

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Old Oct 16th, 2020, 13:33   #1
reevesy
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Default seat heater wont switch off?

hi all...first posted in the wrong s40 section
... so hoping someone can help here

my drivers side seat heater wont switch off..it stays hot all the time...all right for short journeys but gets a bit warm for long one!

i could pull the fuse to stop it but want to fix it....button seems to click on and off ok...and the lights come on when you do

first thought was switch is either sticking or playing up...so my gut reaction was to remove it and see if it needs a clean and a spray of contact cleaner?

cant find any suggestions via google...plenty of people cant get it to work ...but none have complained of not being able to switch it off!?

anyway did'nt know if i'm looking in the right place and how to remove the switch..i was hoping it was a case of just popping it out with samll screwdriver or something...but knowing how cars are built you probably have to strip the consol out!

car is a 2009 s40 so any help /ideas would be most appreciated

cheers
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Old Oct 17th, 2020, 14:44   #2
reevesy
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anyone any ideas?
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Old Oct 17th, 2020, 16:20   #3
Notts Ian
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If the light is behaving properly the switch must be OK. I don't have the wiring diagrams for your car to hand but I bet it's similar to my V50. There is a control module (SHM) for each seat heater. Chances are that one of these is faulty. You could try swapping them over to see if the fault moves with it.
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Old Oct 18th, 2020, 12:09   #4
reevesy
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thanks

was looking at a youtube video about retro fitting heated seats that mentions the module and explains a little bit about the wiring ....looks a straight forward path ....switch to the module thingy under the seat ..then the heater element in the seat.

bit concerned about fiddling around under the seat and the wiring in case i effect the safety air bag and what have you

think i read somewhere that you could trigger the airbag light and that has to be reset by a garage?

cheers
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Old Oct 18th, 2020, 15:15   #5
Notts Ian
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Oh yes. Be very very careful about the airbag system. I understand it's best done with the battery disconnected and left a while. Hopefully others will be able to confirm that.
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Old Oct 18th, 2020, 18:18   #6
reevesy
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thanks.....beginning to sound like its more trouble than its worth

might just take the fuse out
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