This is not my information. I found this through google on Mercedesshop.com/forums.
Credits to Kuan.
Thank you... VERY Usefull information!!
4MATIC Automatically controlled four-wheel drive
AAC Automatic air conditioning
AAM All activity module
A/C Air conditioning (Automatic)
A/C Air conditioning (Tempmatic)
AB Airbag
ABS Anti-lock brake system
ACSR Automatic child seat recognition
ADM Automatic dimming inside rearview mirror
ADS Adaptive damping system
AIR Secondary air injection
AP Accelerator pedal
APS Auto pilot system
AS Antenna systems
ASD Automatic locking differential
ASR Acceleration slip regulation
AT Automatic transmission
ATA Anti-theft alarm
BA Backup assist
BARO Barometric pressure
BCAPC Barometric pressure-charge air pressure compensation
BDC Bottom dead center
BM Base module
BPC Barometric pressure compensation
CA Closing assist
CAN Controller area network
CC Cruise control
CCM Combination control module
CDC CD changer
CF Convenience feature
CFI Continuous fuel injection (electronic)
CFI Continuous fuel injection (mechanical)
CKA Crank angle
CKP Crankshaft position
CL Central locking
CMP Camshaft position
CNS Communication and navigation system
CST Cabriolet soft top
CTEL Cellular telephone
CTP Closed throttle position (idle)
CTU Central triggering unit
DAS Drive authorization system
DI Distributor ignition
DM Diagnostic module
DSV Drive authorization system shut-off valve
DTC Diagnostic trouble code
EA Electronic accelerator
EBR Engine braking regulation
ECL Engine coolant level
ECT Engine coolant temperature
EDC Electronic diesel control
EDR Electronic diesel regulation
EDS Electronic diesel system
EGR Exhaust gas recirculation
EI Electronic Ignition system (distributor-less)
EL Exterior lighting
EMSC Electric mirror, steering column adjustment, heated mirrors
EPC Electronic power control
ESA Electric seat adjustment
ESC Electric steering column adjustment
ESCM Engine systems control module
ESP Electronic stability program
ETC Electronic transmission control
ETR Emergency tensioning retractor
ETS Electronic traction system
EVAP Evaporative emission control system
FAN Fanfare horns
FFS Frame floor system
FOM Folding outside mirrors
FP Fuel pump
GIM Governor impulse method
HCS Headlamp cleaning system
HFM-SFI HFM sequential multiport fuel injection/ignition
HFS Hands-free system
HHT Hand-Held Tester
HM Heated mirrors
HORN Horn signal system
HS Heated seats
IAT Intake air temperature
IC Instrument cluster
IDC In-dash controller
IFI In-line fuel injection
IL Interior lighting
IR Infrared
IRM Inside rearview mirror
ISC Idle speed control
KS Knock sensor
KSS Knock sensor system
LCP Lower control panel
LH-SFI LH sequential multiport fuel injection
LHS Lefthand steering
LOC Low compression
LS Loudspeaker system
MAF Mass air flow
MAP Manifold absolute pressure
ME-SFI ME sequential multiport fuel injection/ignition system
MIL Malfunction indicator lamp
MSC Mirror, steering column adjustment, heated mirrors
MT Manual transmission
MVA Manifold vacuum assist
MWH Main wiring harness
NS Networked Systems (CAN)
O2S Oxygen sensor
OBD On board diagnostics
OC Oxidation catalytic converter
OCP Over-head control panel
ORM Outside rearview mirror
OSB Multi-contour/Orthopedic seat backrest
PL Power locking
PMP Partial intake manifold preheater
PNP Park neutral position
PS Power steering
PSE Pneumatic system equipment
PIS Parktronic system
PW Power windows
PWM Pulse width modulation
RB Roll bar
RCL Remote central locking
RD Radio
REST Residual engine heat utilization
RH Retractable hardtop
RHR Retractable rear head restraints
RHS Righthand steering
RPM Engine speed
RSI Roadster soft top
RIG Retractable trunk lid grip
RTR Remote trunk release
RWD Rear window defroster
SBE Seat belt extender
SLO Starter lock-out
SMS Service microfiche system
SOR Seat occupied recognition
SPS Speed-sensitive power steering
SR Sliding/pop-up roof
SRS Supplemental restraint system
TB Throttle body
TC Transfer case
TCM Transmission control module
TD Speed signal (time division) (EZL)
TDC Top dead center
TIC Transistorized ignition control
TN Speed signal (EZL/AKR)
TPC Tire pressure control
TRAP Trap oxidizer
TWC Three way catalytic converter
VAF Volume air flow
VSS Vehicle speed signal
WS Wiper system
WOT Wide open throttle (full load)
ALL Sensor abreviations.. Ex: o2- Oxygen sensor 
Linear Mode
