System Components

a Location of control module (control module box)
A7/3 ASR/ETS/ESP hydraulic unit
K1 Overvoltage protection relay
K40 Relay module
K20/1 High pressure/return pump relay
L6/1 Left front axle VSS sensor
L6/2 Right front axle VSS sensor
L6/3 Left rear axle VSS sensor
L6/4 Right rear axle VSS sensor
N16/1 Base module (BM)
S9/1 Stop lamp switch (4-pole)
S12 Parking brake switch
X11/4 Data link connector
Y61 Master brake cylinder switchover valve
L6 Rear axle VSS sensor
N47-7 ABS control module

Components not listed here but are shown in image are not applicable to vehicles without ASR or ETS.