So my wife's SLK320 is having itermitent issue where the power seats can't be moved, and then for no reason they start working again. When I had it had the Stealer getting the ESP issues diagnosed and resolved they told me that the car doesn't just have a relay or something like that for the powerseats but rather a completely seperate ECU, that powers the seats and things such as the Airbags and smart car seat stuff. they quoted me $1250 for the ECU and then another $325 for installation.

I haven't been able to find any information about this part or where I could get it used or aftermarket.

Any info would be great