1 = OK, working properly
2 = 4matic control unit
3 = Stoplamp switch
4 = Front left speed sensor
5 = Front right speed sensor
6 = Rear axle speed sensor
7 = Speed sensor's or ABS control unit
8 = Overvoltage protection relay or front axle drive train valve or centre differential lock valve
9 = Overvoltage protection relay or centre differential lock valve, rear axle diff lock valve or stop lamp switch
10 = Overvoltage protection relay, rear axle diff lock valve or stop lamp switch
11 = Overvoltage protection relay or steering angle sensor