Mercedes 4matic Control Unit ECU ECM Up for sale is a Working, in excellent condition Mercedes 4matic control module. removed from a W124 300TE model - 005 545 60 32 Part number . This ECU works fine. . These units now have to be special ordered from most dealers new for big $$ (often times several thousand bucks!), and finding a good one second hand is getting to be a very hard chore. This unit controls the 4WD functions of the car, and although it is not the only source of potential problems with this system, it is commonly the cause of non function. If you can't get the system to turn on, or if it only works sometimes, this is usually your issue.Unit is used, & comes with a 30 day functionality warranty