_________________________________________ I_n_t_e_ ll_,igent technology ,_ _!.!::=~-
The system operates across the entire speed range in combination
w ith t he ABS syst em. If t he Anti -Lock Brake System (ABS) mal fun c-
tions, the ESP will also shut down.
How the system works
The Anti-Lock Brake System (ABS), Elect ronic Differential Lock (EDL)
and the Anti-Slip Regul at ion System (ASR) a re int eg rated in t he e lec -
tronic stab ilizat ion program . In addition to t he data prov ided by
th ese fun ctions, t he ESP control unit re quir es addi t ional meas ure -
ment data provided by hig h pe rformance senso rs . The rot at ional
speed of the vehicle about its vertical axis, veh icle acceleration in the
fore-and-a ft and lateral d irect ions, the brake pressure , a nd the
steerin g a ng le are all measured .
The d irect ion in whi ch the driver w ishes to t rave l is dete rm ine d wit h
the a id of the steering a ngle and ve hicle speed and is con t inually
comp ar ed wit h the a ctu a l behavior of t he ve hicle. If t he two do no t
match, for example, when t he vehicle starts hydroplani ng on a wet
roa d, ESP will automatica lly bra ke the approp riate whee l to co rrect
the problem.
The ve hicle is t hen stab ilized by the fo rces acting on the whee l during
bra king .
If t he ve hicle is oversteering (the vehicle t urns too sharply
and the rear whee ls slide toward the outside of a curve), the brakes
are m ainly applied on the whee l t ha t is on t he outs ide of t he curve. In
the case of a vehicle that is
understeering (the vehicle does not turn
shar ply enough and pu shes out of a curve), the brakes are ap plied as
needed on the whee l t hat is on the inside of t he curve or additionally
on the ot her wheels . An acoustic signal indicates w hen ESP bra ke
applica t ion cuts in=> & .
The system operates across the entire speed range in combination
w ith t he ABS system =>
page 233. If the Ant i-Lock Brake Syst em
(ABS) ma lfunctions, the ESP w ill be out of act ion as we ll.
Activating
When you turn on the engine, ESP wi ll automatica lly be activated and
w ill pe rfor m a se lf-t est . As soo n as t he t es t is co m plete d, th e syst em
is in normal operating mo de.
Controls and equip-
ment
Safety first Vehicle operation
You can activate a deactivated ESP or deactivated ESP/ ASR if req uired
by pressi ng t he =>
page 228, fig . 19 2 => page 22 8, fig . 191 bu tt o n.
Whe n t hey a re act ivated, the m essage
ESP/ ASR on appears br iefly in
the d isp lay.
Deactivating
The ESP shoul d no rma lly be acti vate d a ll t he t im e. If necess ar y, you
can deact ivate Anti-Slip Reg ulat io n (ASR) or th e Electro nic Sta biliza -
t ion Progr a m (ESP) by p ress ing the bu tton =>
page 228, f ig. 19 2.
• Deactivating ASR: Tap th e button . In cer t ain exceptional s itua-
t ions (e.g. driving with tire chains), the Anti -Slip Reg ulation (ASR) can
be dea ct ivat ed =>
page 230. The m ess age ASR off app ear s in th e
display as we ll.
• Deactivating ESP/ASR Press the but t on for mor e tha n 3 seconds .
With the ESP/ ASR deactivated, the indicator light comes on, see
=>
p age 13 . The m ess age ESP swit ched off appe ars in t he display as
we ll.
& WARNING
The Electronic Stabilization Program is nevertheless subje ct to the
laws of physics . It is particularly important to pay attention to
this fact on wet and slippery roads. It is therefore important that
you always adapt your driving to the condition of the road and
traffic conditions . Do not allow the increased safety provided by
the Electronic Stabilization Program system to lull you into
accepting additional safety risks.
u
Vehicle care Do-it-yourself service Technical data
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