Electronic Stability Program control unit component description - GF42.45-P-5119RC

MODEL 171.4 as of model year 09 /YoM 08 model refinement package

N47-5 ESP and BAS control unit

Fig 1: Electronic Stability Program Control Unit Component Location

Courtesy of MERCEDES-BENZ USA

Location The ESP and BAS control unit is located in the left front of the engine compartment.

Task The ESP and BAS control unit has the following tasks: Reading in of sensors, pickups and signals; Evaluating input factors; Control of functions; Actuation of components.

Reading in of sensors, pickups and signals The input factors are read in with the following connections: Direct line; Vehicle dynamics CAN; Drive train CAN.

Direct line The following components are read in via a direct line: BAS diaphragm travel sensor (A7/7b1) - BAS release switch (A7/7s1) - ESP pressure sensor 1 (B34/1) - Left front RPM sensor (L6/1) - Right front RPM sensor (L6/2) - Left rear RPM sensor (L6/3) - Right rear RPM sensor (L6/4) - Right front brake pad contact sensor (S10/2) - Right rear brake pad contact sensor (S10/4)

Vehicle dynamics CAN The ESP and BAS control unit reads in the data from the yaw rate, lateral and longitudinal acceleration sensor (B24/15) via vehicle dynamics CAN.

Engine compartment CAN The ESP and BAS control unit reads in function-relevant information via the engine compartment CAN.

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 lines: Direct line; Engine compartment CAN.

Control of functions The ESP safety system incorporates the following functions: Electronic Stability Program; Acceleration Slip Regulation (ASR); Engine braking regulation (EBR); Antilock brake system (ABS); Electronic brake force distribution (EBV); Brake Assist (BAS); Tire pressure loss warning (without code (494) USA version); Cruise control (with code (440) Cruise control); Variable speed limiter (without code (494) USA version).

Actuation of components To implement the above-specified functions, the ESP control unit actuates the corresponding components via the following lines: Direct line; Engine compartment CAN.

Direct line The following components are actuated via a direct line: - Stop lamp actuation via rear SAM control unit with fuse and relay module (N10/2).

Engine compartment CAN The ESP and BAS control unit transmits requests for function relevant actuations via the engine compartment CAN.

Variants A distinction is made between the following variants: Basic variant - Vehicles with speed-sensitive power steering (with code (213) Speed-sensitive power steering).