Heated seat retrofit with pictures - Page 3

nigwhyrito · #21 03-27-2011, 10:12 PM

XNSF they are not the same the rear footwel lights look like the pic attached they are larger than the normal door lights.
they have 2 nuts each that secure them to the floor. the bulb is 8.00 at the stealer. Its the same bulb in the doors I dont have the part number off the top of my head I called the dealer he quoted me 36 bucks for the 2 lights and then 16 bucks for the bulbs messed that up inpic.. I ended up getting the lights from a parted out thread. Just take a razor blad to the carpet inside the pre cut mold. I made an x on to make the fit as tight as possible then I added some foam from a hardrive case to make the carpet look nice and flush with the lights. the result is below. Now 2 things I need the exact paint on the speaker grilles so i can paint my sub, and my dad or some engineer to get back with me on the parts to order from mouser.

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nigwhyrito · #22 03-27-2011, 10:58 PM

helmuth do you have a pic of what your missing. You said you have the rear heated seats so the wires are dangling at the bottom of the seat. But you are missing the wire harness that goes from the relay K92, the ground in the back x492, I think that is the x337 wire harness you are missing that also goes to x792. you may want to contact Alpine m3 in his 4.6 part out thread see and see if he wants to get rid of his harness since i bought hos switches. Be warned that seat heater harness x337 and x792 go all the way to the front fusebox theres a fuse up there for rear seats and they connect in the back to the main fuse panel to. I was lucky my 06 was pre wired.

nra0707 · #23 03-28-2011, 10:01 AM

Quote:

Originally Posted by nigwhyrito

helmuth do you have a pic of what your missing. You said you have the rear heated seats so the wires are dangling at the bottom of the seat. But you are missing the wire harness that goes from the relay K92, the ground in the back x492, I think that is the x337 wire harness you are missing that also goes to x792. you may want to contact Alpine m3 in his 4.6 part out thread see and see if he wants to get rid of his harness since i bought hos switches. Be warned that seat heater harness x337 and x792 go all the way to the front fusebox theres a fuse up there for rear seats and they connect in the back to the main fuse panel to. I was lucky my 06 was pre wired.

If I'm not mistaken, even if the wiring harness is present for Helmuth or he can source it, doesn't he need the back rest heating elements to complete the circuit? I would suspect that just plugging in the bottom elements wouldn't be enough for the heating elements to work.

Helmuth · #24 03-28-2011, 03:19 PM

To nigwhyrito: Exactly what you wrote. I have the rear heated seats so the wires are dangling at the bottom of the seat. The reason for that is that I got a leather rear seat cover with these elemets and had a guy mounting them. What I have additional (since yesterday) are the rear seat heating switches in original. And you are right again, I am missing the harness from the relay K93 to the seats (part of that might be the wiring from the temp sensor to wherever). Really a great idea to source that harness from Alpine M3 but I believe first I need to disassemble my X in order to be sure that the cabling to the switches is there. BUT - when this cabling is there... why is then the cabling to the heated elements missing.

I believe you get my point.

To nra0707: the backrest heating elements are connected in parallel to the seat elemets. So from a technical standpoint no need to have them.

To Alpine M3: not sure if you want to disassemble your X in order to tell me a price for the cabling............ ???

Thanks everybody.

nigwhyrito · #25 04-02-2011, 08:56 PM

its working the 2wire conversion to 3 wire the elements got hot and the oem switches leds came on and each level worked. So im 75% complete

-whats left-
record exact resistance ratings
order thermistor to take the place of the variable resistor
put thermistor into the seat heat element not the backrest element.
rewire it all into molex connectors
then take the leather covers off
put the covers back on.
make the wife drive more so I can enjoy it lol.
take the X in to have the airbag light reset keeps comming on for
the pass... side
--my schematic attached for left side.---

nra0707 · #26 04-03-2011, 01:30 PM

Awesome work!

Nik · #27 04-08-2011, 01:28 PM

Ok, so I have alrady Put the Buttons in the place, Now I have got the rear Heated seat, going to replace it in few days. Nothing else is needed for them to light up right? Thanks

nra0707 · #28 04-09-2011, 10:28 AM

Nigwhyrito: I was just re-reading your previous post about buying 2 NTC thermistors. I thought NTC decreases resistance as temps increase. Isn't this opposite of what you want? PTC thermistors will increase resistance as the temperature increases, which effectively reduces/cuts current as the surface temperatures of the elements gets too hot.

nigwhyrito · #29 04-10-2011, 12:30 AM

Well NRA you and my dad both said the same thing.. but the truth of the matter is on the wds website the signal says NTC. so im just going by all the research I have read reagarding bmw and the range rover is the elements have NTC thermistors..so i guess we'll see when i finally order one. Also my heated seat elements have a thermostat the little metal circular thing. I tested it with a heat gun when it go to hot the circuit was broken.

nra0707 · #30 04-10-2011, 12:38 PM

Oh, you're right...it does say NTC in the WDS. I didn't even notice that. I'm not going to question the BMW engineers though it does seem counterintuitive. There must be a reason for doing it that way unless they were just lazy and generically labeled them NTC thermistors. The Range Rover link's description of the cantherm thermal switch sounds a lot like a PTC thermistor. Sounds like your elements' circular/disc thermal switches will be added insurance against overheating.

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