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post #1 of 19 (permalink) Old 03-23-2015, 09:33 PM Thread Starter
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Heated Seats

Hi All

Does anyone have a circuit diagram for front seat heaters, my 98 Brooklands drivers one is not working, I suspect its the elements however wanted to check first, the switch is functioning ok however the relay would appear to be permanently energised when the ignition is on, (I do have the seat ecu out but think this only controls position) is this correct? Are the seat heaters like the heated rear window, they come on regardless if its very cold? Or are they simply on and off by the switch? Hope someone can advise.
Many thanks
Andy
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post #2 of 19 (permalink) Old 03-24-2015, 06:56 PM
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They're manually switched. I would check the continuity through the elements of both squab and cushion.

Squab failure are rare so if both are not heating your problem may well be elsewhere.
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post #3 of 19 (permalink) Old 03-25-2015, 05:09 PM Thread Starter
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Many Thanks, seems like the best idea ill let you know.

Best Regards

Andy
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post #4 of 19 (permalink) Old 03-25-2015, 09:18 PM Thread Starter
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Hi Yes byteme you were quite right so thanks for that, I managed to get a circuit diagram from Brian (he's a mind of information) The cushion and squab are wired in series so if one fails they both cease to function. Just need to find a new element (maybe flying spares i guess) or repair maybe? Think I prefer the new option though, then visit a trimmer who may have the tool to refit the metal securing rings which secure the leather to the cushion frame unless anyone has any good tips?
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post #5 of 19 (permalink) Old 03-26-2015, 07:56 AM Thread Starter
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Hi

Does Anyone know where I might get a new element in the UK? Don't really want to repair if I can help it. Not because I cant be bothered but I figure if its broken once it may be getting old and fragile.

Thanks

Andy
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post #6 of 19 (permalink) Old 03-29-2015, 07:31 AM Thread Starter
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Got the cushion out and leather unhitched from the frame, it is not a simple pad at all (on my model 98 Brooklands) but a thin bare wire sewn in and bonded to the leather with thin foam and binding material beneath, without unpicking all the Mulliner stitching its going to be rather difficult to see where its broken, ive ordered a wire break transmitter & detector online so hope to pinpoint the break and access via the back to repair. (New are not available)
Ill let you know if it works or not!!! Otherwise it may be a trimmers sewing and re cover job.
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post #7 of 19 (permalink) Old 03-29-2015, 11:13 AM
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Perhaps new Crewe Original is not available, but there are plenty of aftermarket options.

There's nothing special about the technology Crewe used and it's easy to simply use an aftermarket element pad. See these three options on Amazon:
Dorman Dorman
,
Dayincar Dayincar
,
Kupai Kupai
. I'm sure there are others. If it's only the seat base element that's dead then you'll have a spare element pad left over in the event either the other seat base or one of the seat back elements dies in the future.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr


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post #8 of 19 (permalink) Old 03-29-2015, 03:12 PM
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Cushion element failure were not unheard of when the cars were new and most were caused by the heated pad's element being nicked by the sewing machine needle as the leather cover, foam and element were stitched together.

The logic behind this was to ensure that no relative movement took place between the component parts and in that respect it was 100% successful. A warranty repair by a specialist involved picking the stitches to release the central heated section, obtaining a new pad and stitching together a completely new central section which was then sewn back to the reminder. The irony was that it was the outer bolsters that were always prone to relative movement that created worm lines under the leather.

You could keep and eye out, and contact local specialists to see if they have a good used item for sale. Most original owners specified a very few popular colours so if your car is one of them there is a good chance of success. If however your car is one of the rarer options you'll have far greater difficulty.

The after-market heated pad option is a very good idea however they would have to be narrow enough to fit within the central fluted area of your cushion. If you can't find anything that fits you should contact Aston Martin as they use separate pads that are not only narrow but reasonably priced too.
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post #9 of 19 (permalink) Old 03-29-2015, 07:33 PM Thread Starter
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Thank you for your help on this, ive just two questions. 1/ As the Squab and cushion elements are wired in series I guess I may need to install new in both if I went that route as otherwise the squab would be overpowered? Or are the new pads you buy wired in the same way?

2/ If I did go that route would the pads work ok installed under the foam which is approx 8mm thick? as that way it could go in without having to restich?

Very many Thanks
Andy
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post #10 of 19 (permalink) Old 03-29-2015, 08:00 PM
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The resistance should match the original but if it doesn't then you can incorporate a "work around".

When new, the seats heated very quickly so you may experience a delay due to the insulating effect of the failed heated pad that would then sit above it.

Out of interest, are the dual lumbar supports on each seat working?
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