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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 11-07-2013, 10:37 AM
alysiawallis alysiawallis is offline
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Please help driver side heated seat BURNING MY BOTTOM!

Hello Everyone,

I couldnt find a post with this issue. I purchased my car(2009 323i) in May 2013 and recently have tried to use my heated seat since the cold weather is here. So what is happening is the right side of the seat is getting extremly hot even on the lowest setting, You cant even put your hand on it without pulling away before 3 seconds. Any suggetions for me to try before I send it to the dealership that is going to charge me $153.00 just to diagnose it!

Thank you in advance!

Last edited by alysiawallis; 11-07-2013 at 10:43 AM.
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  #2  
Old 11-07-2013, 12:47 PM
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Chop362 Chop362 is offline
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No tricks here looks like you will need a tech to do a look see, $153 not that bad.
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  #3  
Old 11-07-2013, 01:08 PM
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DSXMachina DSXMachina is offline
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Burned your bottom?

Quote:
Originally Posted by alysiawallis View Post
Hello Everyone,

I couldnt find a post with this issue. I purchased my car(2009 323i) in May 2013 and recently have tried to use my heated seat since the cold weather is here. So what is happening is the right side of the seat is getting extremly hot even on the lowest setting, You cant even put your hand on it without pulling away before 3 seconds. Any suggetions for me to try before I send it to the dealership that is going to charge me $153.00 just to diagnose it!

Thank you in advance!
Pics or it didn't happen.
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  #4  
Old 11-07-2013, 01:14 PM
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CALWATERBOY CALWATERBOY is online now
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Quote:
Originally Posted by alysiawallis View Post
Hello Everyone,

I couldnt find a post with this issue. I purchased my car(2009 323i) in May 2013 and recently have tried to use my heated seat since the cold weather is here. So what is happening is the right side of the seat is getting extremly hot even on the lowest setting, You cant even put your hand on it without pulling away before 3 seconds. Any suggetions for me to try before I send it to the dealership that is going to charge me $153.00 just to diagnose it!

Thank you in advance!

A heated pad under upholstery. Possibly left side open allowing high current right side. Replace.


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  #5  
Old 11-07-2013, 03:57 PM
hondo402000 hondo402000 is offline
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Cal you are the MAN, you know just about eveything! and I mean that respectively
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  #6  
Old 11-07-2013, 03:57 PM
hondo402000 hondo402000 is offline
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is it possible if an open pad, loose wire? Look under the seat with a flash light
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Old 11-07-2013, 04:11 PM
luigi524td luigi524td is online now
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Exclamation Heated seat issues

Quote:
Originally Posted by alysiawallis View Post
Hello Everyone,
I couldnt find a post with this issue. I purchased my car(2009 323i) in May 2013 and recently have tried to use my heated seat since the cold weather is here. So what is happening is the right side of the seat is getting extremly hot even on the lowest setting, You cant even put your hand on it without pulling away before 3 seconds. Any suggetions for me to try before I send it to the dealership that is going to charge me $153.00 just to diagnose it!
Thank you in advance!
BMW has issued several recalls related to heated seats. I recommend hunting these down http://blogs.wsj.com/drivers-seat/20...ectrical-flaw/ before having a dealer burn a hole in your pocket!!
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  #8  
Old 11-07-2013, 04:32 PM
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Cal you are the MAN, you know just about eveything! and I mean that respectively

Well, thank.....wait....


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  #9  
Old 11-07-2013, 05:54 PM
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Originally Posted by DSXMachina View Post
Pics or it didn't happen.
not pics of your burning bottom... we don't want to see you bottom
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Old 11-07-2013, 06:30 PM
BB_cuda BB_cuda is offline
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Quote:
Originally Posted by CALWATERBOY View Post
A heated pad under upholstery. Possibly left side open allowing high current right side. Replace.


okay, heaters. I might know a thing or two about these. It would depend whether the elements are hooked in parallel or series. Cal's idea would not work for parallel as two R's in parallel are less than the one R by itself. If left were open, the circuit would revert back to a single R with a higher R and thus lower current.
R in //: Req=(R1*R2)/ (R1+R2); If R1=R2=8; Req=4

If left and right were in series and left were open, the circuit dies as its open. Me thinks more along the lines of series circuit but a with current feeding to right and then short to ground (imlpying a fault) before continuing on to the left side. This would effectively double the current presuming both sides have same R. Double the current means quadruple the watts as Power =I^2*R. This sounds like the burn your butt mode that you describe.

We had 4 resistors in series on a fuel line heater on STS-43. Workmen accidently had a clamp pinch the circuit between heaters 2 and 3 and it was a dead short to the spacecraft's common ground. As a bonus, the thermostat was on the downstream end of the circuit. So boys and girls, we had the upstream circuit with quadruple power and no thermostat to turn it off and the short took out theromostat out of the effective circuit. That hydrazine line shot up thermally like a rocket and flight controllers had to have crew manually dissable it. We came to know that event as a "smart short". It knew right where to go bad to cause a very severe situation. After that flight, all circuits were changed to put thermostat at front of circuit. It some instances, an overtemp thermostat was also added to stop a runaway condition.

I'm not disagreeing with Cal but it sounds like too high of a current running throught the right side. the series circuit analogy with half way short seems to play. Is the left side normal temp or not heated at all. Cal's picture (guessing from realOEM) shows many heater patches so ther may be multiple circuits to ponder.

Last edited by BB_cuda; 11-07-2013 at 06:32 PM. Reason: always the damn spelling
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  #11  
Old 11-07-2013, 07:42 PM
gcreese gcreese is offline
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In one of my Volvos, the heated seats were fine. Then one day, one got REALLY hot and it failed shortly after. This may be a warning sign that the heating is about to go.
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  #12  
Old 11-07-2013, 09:30 PM
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Quote:
Originally Posted by BB_cuda View Post
I'm not disagreeing with Cal but it sounds like too high of a current running throught the right side. the series circuit analogy with half way short seems to play. Is the left side normal temp or not heated at all. Cal's picture (guessing from realOEM) shows many heater patches so ther may be multiple circuits to ponder.

Yeah, prob parallel. So. Voltage, she no change. T'dissipate more watts, reduce resistance. Lowish resistance short, hot side.

The great truth: Watts = V*V/R

Wait....what if....not internally shorted, but lowish resistance short to ground mid-circuit, hot side? Voltage divider!

Oy! My butt hurts!


.

Last edited by CALWATERBOY; 11-07-2013 at 09:36 PM.
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  #13  
Old 11-08-2013, 02:09 AM
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DSXMachina DSXMachina is offline
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Originally Posted by SilverX3 View Post
not pics of your burning bottom... we don't want to see your bottom
Speak for yourself. On the other hand, if Alysia isn't a female name, I'm feeling kinda creepy.

There's a thermostat in there somewhere. It's gone bad. The thermostat can be as simple as a feedback loop like those reminders on the dashboard that tell you if you've got a light out. The problem is probably not in the element but in the module. Yup, a simple 'computer' controlling seat heating. The damned things are everywhere, probably over 30 in the car.
Works like this; As the element heats up resistance goes up. As resistance increases the module knows that it is at a particular temperature. When resistance reaches level X, according to the driver's setting on the switch, the module knows that the appropriate temperature has been reached.
A short could cause a problem but there are ways the module should pick up on that. I'm guessing it's the module (the 'thermostat') that's...um...kaput.
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Old 11-08-2013, 05:30 AM
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Quote:
Originally Posted by DSXMachina View Post
Speak for yourself. On the other hand, if Alysia isn't a female name, I'm feeling kinda creepy.

There's a thermostat in there somewhere. It's gone bad. The thermostat can be as simple as a feedback loop like those reminders on the dashboard that tell you if you've got a light out. The problem is probably not in the element but in the module. Yup, a simple 'computer' controlling seat heating. The damned things are everywhere, probably over 30 in the car.
Works like this; As the element heats up resistance goes up. As resistance increases the module knows that it is at a particular temperature. When resistance reaches level X, according to the driver's setting on the switch, the module knows that the appropriate temperature has been reached.
A short could cause a problem but there are ways the module should pick up on that. I'm guessing it's the module (the 'thermostat') that's...um...kaput.

What thermostat? If there is one, prob RTD w/chip & switch [transistor], mighty small.

Or, dash button is soft switch w/couple o'resistors.
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Old 11-08-2013, 07:33 AM
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DSXMachina DSXMachina is offline
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Quote:
Originally Posted by CALWATERBOY View Post
What thermostat? If there is one, prob RTD w/chip & switch [transistor], mighty small.

Or, dash button is soft switch w/couple o'resistors.
Quote:
Originally Posted by DSXMachina View Post
There's a thermostat in there somewhere. It's gone bad. The thermostat can be as simple as a feedback loop like those reminders on the dashboard that tell you if you've got a light out. The problem is probably not in the element but in the module. Yup, a simple 'computer' controlling seat heating. The damned things are everywhere, probably over 30 in the car.
Works like this; As the element heats up resistance goes up. As resistance increases the module knows that it is at a particular temperature. When resistance reaches level X, according to the driver's setting on the switch, the module knows that the appropriate temperature has been reached.
A short could cause a problem but there are ways the module should pick up on that. I'm guessing it's the module (the 'thermostat') that's...um...kaput.
Thermostat = Module
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  #16  
Old 11-08-2013, 07:37 AM
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Originally Posted by DSXMachina View Post
Thermostat = Module

What is this module? Show me this module. Or will you run away like the little mouse?

I must see this module. I will show this module who is the boss.




.

Last edited by CALWATERBOY; 11-08-2013 at 08:32 AM.
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Old 11-08-2013, 09:11 AM
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DSXMachina DSXMachina is offline
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Originally Posted by CALWATERBOY View Post
What is this module? Show me this module. Or will you run away like the little mouse?

I must see this module. I will show this module who is the boss.




.
Geeze get a look at...the brown wingtips Borat's wearing. The man clearly has no sense of style. Black would have gone much better with the, the, whatever it is.

/Now returning thread to subject at hand/
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Old 11-08-2013, 09:19 AM
BB_cuda BB_cuda is offline
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Originally Posted by CALWATERBOY View Post
What thermostat? If there is one, prob RTD w/chip & switch [transistor], mighty small.

Or, dash button is soft switch w/couple o'resistors.
We space peeps now use thermistors which tell a controller to turn off or on. It is closed loop feedback type control.

Yes CAL, P=V^2/R=I^2*R. same thing either way. I used the I^2*R way to demonstrate how power quadruples if current doubles.
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Old 11-08-2013, 12:04 PM
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Zooks527 Zooks527 is offline
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Originally Posted by DSXMachina View Post
Geeze get a look at...the brown wingtips Borat's wearing. The man clearly has no sense of style. Black would have gone much better with the, the, whatever it is.
Those aren't brown. They're cordovan.
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Old 11-08-2013, 12:43 PM
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Originally Posted by CALWATERBOY View Post
What is this module? Show me this module. Or will you run away like the little mouse?

I must see this module. I will show this module who is the boss.




.
I dont want to see Borat bottom.... ewwww
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Old 11-08-2013, 01:03 PM
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DSXMachina DSXMachina is offline
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Those aren't brown. They're cordovan.
Oh, cordovan? Brown with a little ox blood thrown in for good measure. That makes all the difference. I take back everything I said.
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Old 11-08-2013, 01:46 PM
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Originally Posted by DSXMachina View Post
Geeze get a look at...the brown wingtips Borat's wearing. The man clearly has no sense of style. Black would have gone much better with the, the, whatever it is.

Who....who is this Borat of which you speak?
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