I've got a set of seats indoors so have just taken a peek.
The foams are the same for both manual and electric.
There are two wires which go to the heater elements (yellow and orange/white) and with both elements ok, there should be about 2 Ohms across the pins. I thought the elements were in series, but having disconnected the back rest and tested on its own then this was approx. 4 Ohm. so they must be connected in parallel.
so if you've got 2 Ohm then everything is working ok, anything else then something is amiss. I think the thermostat would be in series with the elements.
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