Component Description For Electronic Stability Program Control Unit - GF42.45-P-5119LFA

Model 222.173 

as of model year 2018 

Location 

The Electronic Stability Program control unit is located in the engine compartment, at the left next to the BAS brake booster (A7/7) at the traction system hydraulic unit.

Tasks 

The Electronic Stability Program control unit contains the control for the following systems:

• Regenerative braking system
• Electric parking brake
• Radar-based regenerative braking system
• Electronic Stability Program (ESP®)
• Electronic brake force distribution (EBD)
• Anti-lock braking system (ABS)
• Acceleration skid control (ASR), electronic traction system (ETS)
• Brake Assist (BAS)
• BAS PLUS (with CODE 23P (Driving assistance package))
• Hill Start Assist
• Adaptive brake lights, flashing (except with CODE 494 (USA version))
• Dry braking
• Precharging, depending on accelerator pedal actuation
• Precharging, depending on lateral acceleration
• HOLD function
• ESP® trailer stabilization (with CODE 550 (Trailer hitch))
• PRE-SAFE® system
• Standstill control (SSC)
• Steer Assist
• Crosswind Assist
• Tire pressure loss warning (RDW) Tire pressure monitor (with CODE 477 (Tire pressure loss warning))
• Variable speed limiter (except CODE 23P (Driving assistance package))
• Cruise control (except CODE 23P (Driving assistance package))

Model 222.173

as of model year 2018

with code 23P (Driving Assistance package)

The variable speed limiter and cruise control are integrated into the

Mercedes-Benz Intelligent Drive control unit (N62/4).

The Electronic Stability Program 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 
• Suspension FlexRay (Flex E) 

Direct line 

The following signals are read in via direct lines:

• Circuit 30
• Circuit 31
• Traction system hydraulic unit
• Pedal angle sensor (B37/1)
• Dual brake vacuum sensor (B150/2)
• Left front axle rpm sensor (L6/1)
• Right front axle rpm sensor (L6/2)
• Left rear axle rpm sensor (L6/3)
• Right rear axle rpm sensor (L6/4)
• Brake vacuum pump relay (K40/8kI)
• Electrical parking brake switch (S76/15)

Chassis FlexRay 

The Electronic Stability Program control unit is a subscriber to chassis FlexRay. It communicates with the following control units:

• Instrument cluster (A1)
• Supplemental Restraint System control unit (N2/10)
• CDI control unit (N3/9) (with diesel engines)
• ME-SFI control unit (N3/10) (with gasoline engines)
• Front SAM control unit (N10/6)
• Rear SAM control unit (N10/8)
• Mercedes-Benz Intelligent Drive control unit (N62/4) (with code 23P (Driving Assistance Package))
• Electrical power steering control unit (N68)
• Left front door control unit (N69/1)
• Right front door control unit (N69/2)
• Electronic ignition lock control unit (N73)
• Steering column tube module control unit (N80)
• Powertrain control unit (N127)

Evaluation of input factors 

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

Actuation of components 

Components are actuated with the following line:

• Direct line Direct line 

The following components are actuated via direct lines:

• Traction system hydraulic unit
• Brake vacuum pump relay
• Vacuum pump relay (K40/8kQ)
• Left electric parking brake actuator motor (M76/1)
• Left electric parking brake actuator motor (M76/2)

Wiring diagram for Adaptive Brake (ABR)

PE42.47-P-2000-97SEB