computer MERCEDES-BENZ S550 2007 W221 Owner's Manual

669 Technical terms
ABC
(A
ctive B
ody C
ontrol)
Active, computer-controlled system
that hydraulically adjusts the suspen-
sion at all four wheels in response to
various driving situations.
ABS
(A
ntilock B
rake S
ystem)
Prevents the wheels from locking up
during braking so that the vehicle can
continue to be steered.
Accessory weight
(
page 526)
Adaptive Brake
Brake system that is coupled with
->ABS, ->ESP and ->BAS. Adaptive
Brake takes driver and vehicle charac-
teristics into consideration, thus
achieving an optimal braking effect.ADS
(A
daptive D
amping S
ystem)
Automatically adapts the optimum sus-
pension damping to prevailing driving
conditions.
Advanced TPMS*
(T
ire P
ressure M
onitoring S
ystem)
The Advanced TPMS monitors the tire
inflation pressure in all four tires. A
warning is issued to alert you to a de-
crease in pressure in one or more of
the tires. Tire inflation pressure inquir-
ies are made using the ->Instrument
cluster control system.
Airmatic
Automatically selects the optimum sus-
pension tuning and ride height for your
vehicle. Airmatic consists of two com-
ponents:


Adaptive Damping System


Vehicle level controlAir pressure
(
page 526)
Alignment bolt
Metal pin with thread. The centering
pin is an aid used when changing a tire
to align the wheel with the wheel hub.
A-pillar
Front connecting pillar between the
roof and the vehicle body (->B-pillar,
->C-pillar).
Aspect ratio
(page 526)
Bar
(page 526)
BAS
(Brake A
ssist S
ystem)
System for potentially reducing braking
distances in emergency braking situa-
tions. The system is activated when it
senses an emergency based on how
fast the brake is applied.

676 Technical termsPCMCIA
(P
ersonal C
omputer M
emory C
ard
I
nternational A
ssociation)
Portable memory cards designed to be
inserted into laptop computers to en-
able additional functions.
PIN code
(P
ersonal I
dentification N
umber code)
Your PIN code prevents unauthorized
persons from using your ->GSM mobile
phone. The PIN code is a number
string, which you have to enter when
switching on the telephone.
Poly-V-belt drive
Drives engine components (alternator,
AC compressor, etc.) from the engine.Power train
Collective term designating all compo-
nents used to generate and transmit
motive power to the drive axles, includ-
ing:


Engine


Clutch/torque converter


Transmission


Transfer case


Drive shaft


Differential


Axle shafts/axles
PRE-SAFE
®
(Pre
ventive Occupant Safe
ty System)
Vehicles equipped with PRE-SAFE
®
take preventive measures when the
system senses certain driving dynam-
ics suggesting a possible accident.
Production options weight
(
page 527)Program mode selector switch
Used to switch the automatic transmis-
sion between standard operationS and
comfort operationC.
PSI
(P
ounds per s
quare i
nch)
(
page 527)
PUK
(Personal U
nblocking K
ey)
Must be entered if the wrong ->PIN was
entered three consecutive times.
Recommended tire inflation pressure
(
page 527)
REST
(Residual engine heat utilization)
Feature that uses the engine heat
stored in the coolant to heat the vehi-
cle interior for a short time after the en-
gine has been turned off.