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Author Topic: Heated seat  (Read 1954 times)

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GaryBC

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Heated seat
« on: 23 December 2009, 12:28:42 »
Driver's side seat heater runs on full power even when "1" selected.

Any ideas where to start looking? (In order of "easiest to check" first please! :))
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tunnie

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Re: Heated seat
« Reply #1 on: 23 December 2009, 12:33:00 »
if you have leather 1 is plenty hot enough, less of an effect on cloth. I put it on 1 if leather, 3 if cloth
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RobG

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Re: Heated seat
« Reply #2 on: 23 December 2009, 12:37:37 »
Quote
Driver's side seat heater runs on full power even when "1" selected.

Any ideas where to start looking? (In order of "easiest to check" first please! :))
Re-read the post Tunnie ::) ::) ;D
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Elite Pete

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Re: Heated seat
« Reply #3 on: 23 December 2009, 12:40:54 »
Quote
if you have leather 1 is plenty hot enough, less of an effect on cloth. I put it on 1 if leather, 3 if cloth
:-?
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tunnie

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Re: Heated seat
« Reply #4 on: 23 December 2009, 12:58:58 »
eh, what am i missing?? He says 'full power' but driving father tunnies facelift with leather, my arse is on fire before i get to the end of the road with it set to 1....
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RobG

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Re: Heated seat
« Reply #5 on: 23 December 2009, 13:00:46 »
I think OP means that he has no thermo regulator when using the 1-5 switch settings
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Jimbob

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Re: Heated seat
« Reply #6 on: 23 December 2009, 13:01:17 »
Quote
eh, what am i missing?? He says 'full power' but driving father tunnies facelift with leather, my arse is on fire before i get to the end of the road with it set to 1....


Thats better than those last 2 posts you deleted.

Still not sure you have it...been on the Sherry & mince pies?

wheel set to no1......seat far too hot.

Therefore sounds like a thermostat issue.


Gary, does the temperature further increase on going to 2,3,4 or 5?  or is it a case of the seat heater is just on or off with no thermostatic control?
« Last Edit: 23 December 2009, 13:01:54 by jimbob »
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tunnie

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Re: Heated seat
« Reply #7 on: 23 December 2009, 13:02:10 »
Quote
I think OP means that he has no thermo regulator when using the 1-5 switch settings

Welcome to seat heaters! As i mentioned with leather it gets hot quickly and straight away, never noticed much of a difference with the settings.

With cloth its a bit more noticable, but still roasts your arse quickly.
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tunnie

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Re: Heated seat
« Reply #8 on: 23 December 2009, 13:03:08 »
Quote
Quote
eh, what am i missing?? He says 'full power' but driving father tunnies facelift with leather, my arse is on fire before i get to the end of the road with it set to 1....


Thats better than those last 2 posts you deleted.

Still not sure you have it...been on the Sherry & mince pies?

wheel set to no1......seat far too hot.

Therefore sounds like a thermostat issue.


Gary, does the temperature further increase on going to 2,3,4 or 5?  or is it a case of the seat heater is just on or off with no thermostatic control?

Champaign + empty tummy :-X
« Last Edit: 23 December 2009, 13:03:24 by tunnie »
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Jimbob

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Re: Heated seat
« Reply #9 on: 23 December 2009, 13:05:14 »
Quote
Quote
Quote
eh, what am i missing?? He says 'full power' but driving father tunnies facelift with leather, my arse is on fire before i get to the end of the road with it set to 1....


Thats better than those last 2 posts you deleted.

Still not sure you have it...been on the Sherry & mince pies?

wheel set to no1......seat far too hot.

Therefore sounds like a thermostat issue.


Gary, does the temperature further increase on going to 2,3,4 or 5?  or is it a case of the seat heater is just on or off with no thermostatic control?

Champaign + empty tummy :-X


That explains a lot  ;D


we have this guide on seat pads, not sure it will help you much though....

http://www.omegaowners.com/forum/YaBB.pl?num=1192830810
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GaryBC

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Re: Heated seat
« Reply #10 on: 23 December 2009, 13:26:30 »
Looks like I could have worded my question a bit better! One or more of us have been hitting the mince pies and sherry a bit too hard methinks!

Ok, here goes. What it always used to do was this: Position 1 - just off the cold; position 2 - comfortably warm; position 3 - uncomfortably warm; position 4 - hot; position 5 - roasted nuts!

What it does now is: position 1 to 5, roasted nuts! All switch positions result in the same heat setting - ie full on. It only now has two settings - off and too Firkin hot (note that this is the Imperial 'Firkin' measure - I don't do metric!).

I have cloth seats by the way. (I didn't mention this before as I didn't think it mattered - the seat element is working perfectly!)

So what components do I have in the system? The element is ok and I guess the switch is too. Which leaves - I guess - the control circuitry conprising some electronics in one or more PFM boxes, a relay or two (or four) and 'normal' and/or safety (over)heat sensors? Where are they all and which is most likely to fail?
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Jimbob

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Re: Heated seat
« Reply #11 on: 23 December 2009, 13:41:24 »
So...is the passenger seat working as it should be?
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Jimbob

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Re: Heated seat
« Reply #12 on: 23 December 2009, 13:50:14 »
Quick look in Tis shows....

Switch itself could be faulty, S55 drivers, S30 passengers

relays k184 for drivers and k183 for passengers

temp sensor P90 drivers, P87 passengers

where these bits are...I dont know sorry, but swapping any over may transfer the problem and help the diagnosis
« Last Edit: 23 December 2009, 13:50:45 by jimbob »
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Andy H

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Re: Heated seat
« Reply #13 on: 23 December 2009, 14:01:57 »
A word of caution. If you have an airbag in the side of the seat then disconnect the battery 20 minutes before touching any of the electrical connectors under the seat.

Lots of people have triggered the airbag warning lamp by unplugging the wrong connector with the battery connected (and it needs Tech2 to reset it, it won't reset itself)
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GaryBC

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Re: Heated seat
« Reply #14 on: 23 December 2009, 14:12:56 »
I bet nobody has a circuit diagram I could take a look at? Is the heater power controlled using a simple resistor cascade (I doubt it) or electronically (eg mark-space ratio)?
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