Lost lumbar controls recently. Plugged ISTA and ran diagnostics and it did not pull any codes related to this failure. The only thing that ISTA complained about was that ECU parameters where not correct when i ran ECU functions again SM module which controls seating functions. Ran a search and apparently there is little to no information on this so i decided to check the fuse related to the SM module. Its turns out that there are 7 or 8 fuse for the seat functions alone. I found the problem with fuse number 67 which is on the front fuse block behind the glove box. Please refer to the fuse chart as the fuse blocks are not marked at all. Hope this helps.
Credit to Lotus7 for the pictures