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

MODEL 166 

up to model year 2016 

Illustrated on model 166.0 

Fig 1: Electric Parking Brake Control Unit Component Location - Model 166 Up To Model Year 2016

Courtesy of MERCEDES-BENZ USA

Location 

The electric parking brake control unit is located below the rear bench seat on the right side.

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 via the following connections:

• Direct line 
• Chassis CAN 1 (CAN E1) 

Direct line 

The status of the electric parking brake switch (S76/15) is read in directly.

Chassis CAN 1 

The following information is read in over chassis CAN 1:

• Status circuit 15 ON, 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 left front door safety catch microswitch (A85s1), from left front door control unit (N69/1), which sends the status over the interior CAN (CAN B) and the electronic ignition lock control unit to chassis CAN 1
• Selector lever position of fully integrated transmission control unit (Y3/8n4), status circuit 61 ON and accelerator pedal position, from CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine)
• Wheel speeds to determine the vehicle speed, from the electronic stability program control unit (N30/4)

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 1 

The following components are actuated via chassis CAN 1:

• Instrument cluster (A1) (output of messages and warnings), via the electronic ignition lock control unit and chassis CAN 2
• Electronic Stability Program control unit (initiation of emergency braking)