Electric Parking Brake Control Unit, Component Description - GF42.20-P-5005RD

Model 172.4

up to Model year 2017

Viewed from rear

Fig 1: Electric Parking Brake Control Unit Components Location - Model 172.4 Up To Model Year 2017, Viewed From Rear

Courtesy of MERCEDES-BENZ USA

Location

The electric parking Brake control unit is on the right on the control unit carrier in the luggage compartment.

Tasks

The electric parking Brake control unit has the following tasks:

Reading in of signals
Evaluation of input factors
Actuation of components

Reading in of signals

The input factors are read in over the following connections:

Direct line
Chassis CAN (CAN E)

Direct line

The signals from the following component are read in via direct lines:

Status of the electric parking Brake switch (S76/15)

Chassis CAN

The following information is read in over the chassis CAN:

"Circuit 15R ON" status, from the electronic ignition lock control unit (N73)
Status of driver seat belt buckle restraint system switch (S68/3), from the supplemental restraint system control unit (N2/10)
Status of trunk lid rotary tumbler switch (M14/7s1), from front SAM control unit with fuse and relay module (N10/1), which receives the status from the rear SAM control unit with fuse and relay module via interior CAN (CAN B)
Road gradient, from the Electronic Stability Program control unit (N30/4), which receives the signal from the turn rate, lateral acceleration and longitudinal acceleration sensor (B24/15) (with code 233 (DISTRONIC PLUS)) via vehicle dynamics CAN (CAN H), or directly determined by the Electronic Stability Program control unit (except code 233 (DISTRONIC PLUS)).
Wheel speeds and enable signal by the Electronic Stability Program control unit
Selector lever position from electronic selector lever module control unit (N15/5) (with code 427 (7G-TRONIC)) or DIRECT SELECT INTERFACE (N150) (with code 421 (9G-TRONIC)), circuit 61 ON status and accelerator pedal position, from CDI control unit (N3/9) (with diesel engine) or ME-SFI control unit (N3/10) (with gasoline engine)

Evaluation of input factors

The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Actuation of components

The actuation of the components takes place via the following connections:

Direct line
Chassis CAN

Direct line

The electric parking Brake control unit actuates the left electric parking Brake actuator motor (M76/1) and the right electric parking Brake actuator motor (M76/2) via a direct line.

Chassis CAN

The following components are actuated via the chassis CAN:

Instrument cluster (A1) (output of messages and warnings)
Electronic Stability Program control unit (initiation of emergency braking)

Wiring diagram for electric parking Brake control unit

PE42.20-P-2101-97TAA