318 HO ABC (DPS) 03-06-02

R230 Active Body Control (ABC)

These technical training materials are current as of the date noted on the materials, and may be revised or updated without notice. Always check for revised or updated information. To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer  to the latest Mercedes-Benz Technical Publication and follow all pertinent instructions when t esting, diagnosing or making repair. Illustrations and descriptions in this t his training reference are based on preliminary information and may not correspond to the final US version vehicles. Refer to the official offi cial introduction manual and WIS when available. Copyright Mercedes-Benz Mercedes-Benz USA, LLC, 2002 

Reproduction by any means or by any information storage and retrieval system or translation in whole or part is not permitted  without written authorization from Mercedes-Benz USA, LLC or its successors. Published by Mercedes-Benz USA, LLC  Printed in U. S.A.

Objectives & Agenda •

Quick Review of ABC

•

Changes to ABC in the R230  –

Struts

 –

Sensors

 –

Control Unit

 –

SDS Procedures

Functions of ABC •

Automatically maintains vehicle level setting

•

Adjusts ride height based on speed  –

Lowers car as speed increases and raises car  back up as speed decreases

•

Switch raises car two positions

•

An additional switch for a sport setting

Sensors - Review •

Body acceleration sensors - three  –

•

Lateral acceleration sensor - one  –

•

Measures acceleration and deceleration

Vehicle level sensors - four   –

•

Measures side to side acceleration

Longitudinal acceleration sensor - one  –

•

Measures vertical acceleration of the body and body pitch and roll

Measures vehicle level at each wheel

Strut motion sensor - four   –

Determines the position of the hydraulic cylinder 

Service Notes - Review • Country ve version co code in in EI EIS • Goes Goes auto automa mati tica calllly y to to shu shuto toff ff (clo (close sed d val valve ve posi positi tion on)) when raised on a lift • SAFETY  – Uses Uses same same flui fluid d as power power stee steerin ring g unit unit  – High High Pre Press ssur ure e (ov (over er 200 200 bar) bar)  – Always Always depr depress essuri urize ze syste system m before before remov removing ing hydraulic components

R230 ABC Components

Front Axle Valve Unit (Y36/1) Remove paneling under left bumper  cover to access B40/1 temperature sensor  14 pressure reservoir 

Rear Axle Valve Unit Y36/2 Remove wheel well lining to access 4 - supply pressure reservoir  53 - return pressure reservoir 

Pressure Supply Valve Unit # Remove wheel well lining to access B4/5 pressure sensor  52a pulsation damper 

Struts • Differences be between R230 and 215 – Fewer co coils  – Coil Coils s spa space ced d fur furth ther  er  apart  – Incr Increa ease sed d tens tensilile e strength and tension rate

Front Strut

Rear  Strut

Control Unit - N51/2

ABC Control Module (N51/2) • Ride Ride heig height ht posi positi tion on is 3mm 3mm low lower er in the the Uni Unite ted d States than the rest of the world • If ABC ABC con contr trol ol modu module le cann cannot ot reco recogn gniz ize e EIS EIS national code, (CAN problem for example), then it uses the last known setting • Load compensatio tion ca calculation

Load Compensation Calculation • Improves ride quality • Must Must do loa load d com compe pens nsat atiion cal calc culat ulatio ion: n:  – Afte Afterr doin doing g a leve levell cali calibr brat atio ion n  – After After doin doing g a plung plunger er sens sensor or cali calibra bratio tion n If calculation is not done then an error message will  appear in the instrument cluster.

Load Compensation SDS Procedures • Enter into ABC • Enter into Control Unit Adaptations

Load Compensation SDS Procedures • Notice requirements • Press F2

Load Compensation SDS Procedures • Press F3

• Nothing physically happens

Load Compensation SDS Procedures

• ABC will make its calculation • This message will appear when finished • Click OK and procedure is over 

Acronym List (Used in this handout.)

ABC - Active Body Control CAN - Controller Area Network EIS - Electronic Ignition Switch