Just wondered if anyone has encountered the same problem or even better found a fix!

The vehicle has heated and cooled seats and kind of blows air through holes in the seat cover. The passenger side works fine, all the lights come on and it it heats and cools properly and you can hear the 'fan' operating constantly when in the cool position and just hear initially when its first put in to the heat setting, it heats it fine.

The drivers side, again when you turn the knob to cool the 3 blue lights light up and when you turn to heat the 3 red lights light up and also inside the button the top and bottom lights on the seat picture light up. However the seat does not cool nor heat and there is no fan noise either initially when set to heat or constantly when set to cool like on the passenger side.

I have been in to my local dealer and they have a £115 + VAT an hour diagnostic charge, they have had one in with similar a similar problem and it was actually a module in the centre console that had failed and it was nothing to do with anything in the seat on that occasion. The dealer has explained how complicated the seats are on this particular type of vehicle with numerous relays/modules/wiring looms that could possibly fail resulting in the current problem.

Because there is no fan noise does this mean that that 'bit' just needs replacing or could it be something else? I use a very good independent and if I could tell him what it was then he can replace it at a much more reasonable price, however he does not have access to Land Rover computers and diagnostic machines so is unable to pin point the problem thus would be a labourious process probably without success. In fact I am not sure if the Land Rover diagnostic machine could pinpoint the problem anyhow.

Any ideas?

I'm no expert at all on such matters.

But it seems you have a dilemma. Go your trusted indy route and take a chance or swallow hard, purse your lips and go main dealer, but get it right first time.

I would venture that the seat isn't faulty and tend to agree on some form of control mudule being the culprit. As you indicate, nothing on the seat works, yet the controls do their bit. Something in the middle, perhaps? It lends weight to the module diagnosis.

I would have thought that if the seat were faulty, you'd not lose functionality on both heating and cooling at the same time. Again, this lends weight to the control module (or something around there) not doing its bit.

If it were the switch, the lights wouldn't light.

The main dealer can at least check all systems with their diagnostic tools and give you further peace of mind. Your indy chap cannot.

Me? I'd want peace of mind and the job done right first time. Sometimes it's cheaper that way if you have a good dealer and have faith in what they say.

Good luck.  Si. <This is my name.

I eat rat poison.

A man ain't truly been insulted until he stands buck naked in front of a woman and she didn't even notice. Or care.

I'd be tempted to check the basics first. Have the connectors under the seat worked loose or been damaged due to the cables being pulled in and out by one short and one tall driver. If you see my meaning?

I had a similar problem on mine (also a tdv8 vogue se). In the end it was with the dealer, Marshalls of Cambridge, for about a week all told being diagnosed and the repaired (under warranty, phew). They gave a similar story about part of the control circuit not working properly but I am not certain which but it was, sorry.

Mine also stopped working once only on the drivers side. The next day, they worked. Go figure. Discovery 4 HSE
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I have had issues with both seats, the passenger seat the fans actually needed replacing, £600. The drivers side was the control module £200 both were fixed by main delalers.

I would say its a main dealer issue but keep them on a tight leash. I had a similar problem. Pass side fine. Drivers side all lights on but no heat. However worked fine for my wife. We checked everything obvious then main dealer decided to fit new fan £600 and still didnt work. Turned out to be one of the pipes in the back of the chair that sends the air around had come loose causing the air to blow over the fan unit. The fan unit was then getting too hot and shutting down. When my wife was in the car she was not heavy enough to dislodge the pipe - Simples !

We called it quits on the diagnostic time vs new fan that was not needed but without the dealer I think we could have been looking for this issue for a very long time. There are just so many things it could be.

Thanks everyone for their replies. I spoke to indy and he is currently investigating another one which has exactly the same issue. Maybe there will be a few more eventually also knowing Land Rover. He is going to report back to me with his findings, so just having new pads and discs all round, numberplate light, horn, door seal and a battery check!! Thank god its not dealer prices!! Will reply again if/when I find out what it is.

Did you find the problem?
I have exactly the same issue
Don't fancy paying 600 quid for a plastic fan.

I've been getting the following code thrown if i turn my seats up to full heat on the drivers side: http://www.micro-tronik.com/faultcodes/obdiifaultcode_b1156.html

Solution so far seems to be to only turn them on half-way. I really don't fancy forking out £200 for a control module so if anyone knows if these are repairable I'd be quite pleased to know how!  
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Resurrecting this thread as I am on my 3rd control module My drivers heated seat function stopped working at least 18 months ago and I managed to locate a 2nd hand replacement last year which unfortunately didn't solve the problem So rather than forking out such a stupid amount for a new one from the dealer and thinking that my 2nd hand one must be suffering the same fault I have been patiently waiting to "source" a new one.

Last week I found a brand new one sealed in a box at a sensible price which I have installed this morning but sadly with the same result So clearly there is another issue.

If anyone can shed any light on what else to try I would welcome your comments, I am going to try and connect one of the "removed" modules "out of the seat" to see if for some reason the heated air is not circulating correctly so maybe I have a blocked pipe. Does anyone know if the fan in the seat back only blows the heated air generated from the module beneath the seat or does it heat its own? The workshop manual isn't clear

Cheers,
Andy. 2015 L405 SDV8 Autobiography, Indus Silver with Black Pack.
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I ended getting my heated /cooled seat fixed at Team Valley Land Rover service centre in Gateshead.

Fan in back rest needed replacing - £600 -

New fan failed within a week and replaced with a second new fan.

Now works

I had mine done at the dealer again it was circa 500 quid from memory but they did replace the fans and then the control modules all in the price as the seat didn't work after they changed first part so they never charged for it and have to say I had a loan car for the duration quite a big bill but brilliant service - probably doesn't help much but as others have said they are complicated so what I did was pay for diagnostics then got a quote for it fixed which they didi and stuck to

It's worth seeing if the pipe between the fan and the Peltier cell has split mine had on my back rest and if the fan runs and no air gets to the cell the unit will shut down but leave the lights on , I have bodged with gaffer tape until I can source a new pipe. The split is right where it goes behind the metal cross bar .

Hi all. Drivers seat. It heating and have the following codes
B1156-7A (2. Drivers seat cushion

B1154-98 (2. Drivers seat backrest


Any help much appreciated. 2015 4.4 AB
GSXR 1000 K5
R1 1998