Electric parking brake control unit, component description - GF42.20-P-5005RF

Model 205 with code 990 (AMG vehicles) 

Shown on model 205.0 

Location 

The electric parking brake control unit is located at the left in the trunk behind the partition wall to the vehicle interior.

Tasks 

The electric parking brake control unit has the following tasks:

• Reading in of sensors and signals
• Evaluation of input factors
• Actuation of components

Reading in of signals 

The input factors are read in via the following connections:

• Direct line 
• Periphery CAN (CAN PER) 

Direct line 

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

• Status of electric parking brake switch (S76/15)

Peripherals CAN 

The following information is read in via the peripherals CAN:

• Status circuit 15 ON, from the electronic ignition lock control unit (N73)
• Status of driver seat belt buckle switch (S68/3), from Supplemental Restraint System control unit (N2/10), over the user interface CAN (CAN HMI) and the electronic ignition lock control unit
• Status of the trunk lid/liftgate lock (A85/5), from the rear SAM control unit (N10/8) via interior CAN (CAN B) and the electronic ignition lock control unit
• Status of left front door rotary tumbler switch (A85s1), from left front door control unit (N69/1), via the interior CAN to the electronic ignition lock control unit
• Currently engaged gear range from the fully integrated transmission control unit (Y3/8n4), status drivetrain operational, engine running and the accelerator pedal position from the ME control unit (N3/10) via the drive train CAN and the powertrain control unit (N127)
• Wheel speeds for determining the vehicle speed, from the Electronic Stability Program control unit (N30/4) over the chassis FlexRay (Flex E) and the electronic ignition lock control unit

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 
• Peripherals 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.

Peripherals CAN 

The following components are actuated over the periphery CAN:

• Electronic Stability Program control unit (introduction of emergency braking) over the electronic ignition lock control unit and chassis FlexRay
• Instrument cluster (A1) (display of messages and warnings) via electronic ignition lock control unit and user interface CAN

Wiring diagram for electric parking brake control unit

PE42.20-P-2101-97FBA