4MATIC – 4 Wheel Drive
TC – Transmission Control
A/C – (Automatic) Air Conditioning (Automatic)
A/C – (Tempmatic) Air Conditioning (Tempmatic)
AAC – Automatic Air Conditioning
AAM – All Activity Module
AB – Supplemental Restraint System (Airbag)
ABS – Anti-lock Brake System
ACSR – Automatic Child Seat Recognition
ADM – Automatic Dimming Inside Rearview Mirror
ADS – Automatic Damping System (Suspension)
AIR – Secondary Air Injection
AKR – Anti-Knock Regulation
AP – Accelerator Pedal
APS – Auto Pilot System
AS – Antenna System
ASD – Automatic Locking Differential
ASR – Acceleration Slip Regulation
AT – Automatic Transmission
ATA – Anti-theft Alarm System
BA – Backup Assist
BARO – Barometric Pressure
BCAPC – Barometric Pressure-charge Air Pressure Compensation
BDC – Bottom Dead Center
BM – Base Module (Master Ecu Controller)
BPC – Barometric Pressure Compensation
CA – Closing Assist
CAN – Controller Area Network
CC – Cruise Control (Tempomat)
CCM – Combination Control Module
CDC – Cd Changer
CF – Convenience Feature
CFI – Continuous Fuel Injection
CKA – Crank Angle
CKP – Crankshaft Position
CL – Central Locking
CLUS – Instrument Cluster
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 – Driver Authorization System
DFI – Electronic Distributor-type Fuel Injection
DI – Distributor Ignition System
DM – (USA) Diagnostic Module (Emissions)
DTC – Diagnostic Trouble Code
EA – Electronic Accelerator
EAG – Electronic Automatic Transmission Control
EATC – Electronic Automatic Transmission Control
EBR – Engine Brake Regulation
ECL – Engine Coolant Level
ECT – Engine Coolant Temperature
EDC – Electronic Diesel Control
EDR – Electronic Diesel Regulation
EDS – Electronic Diesel System
EDW – Anti-theft Alarm System
EFP – Electronic Accelerator
EGR – Exhaust Gas Recirculation
EGS – Electronic Transmission Control
EI – Electronic Ignition (distributorless)
EIFI – Electronic In-line Fuel Injection
EL – Exterior Lighting
EMSC – Electric Mirror, Steering Column Adjustment, Heated Mirrors
EPC – Electronic Power Control
ERE – Electronic In-line Fuel System
ESA – Electric Seat Adjustment
ESC – Electric Steering Column Adjustment
ESCM – Engine System Control Module
ESP – Electronic Stability Program
ETC – Electronic Transmission Control
ETR – Emergency Tensioning Retractor
ETS – Electronic Traction System
EVAP – Evaporative Emission Control System
EVE – Electronic Distributor-type Fuel Injection
EZL – Distributor Ignition System
FAN – Fanfare Horns
FFS – Frame Floor System
FOM – Folding Outside Mirrors
FP – Fuel Pump
GIM – Governor Impulse Method
GM – Base Module (Master Ecu Controller)
HAU – Automatic Heater
HCS – Headlamp Cleaning System
HEAT – Automatic Heater
HFM – Hot Film Engine Management
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 – Electronic In-line Fuel System(diesel)
IFZ – Infrared Remote Central Locking
IL – Interior Lighting
IR – Infrared
IRCL – Infrared Remote Central Locking
IRM – Inside Rearview Mirror
ISC – Idle Speed Control
KE – Continuous Injection System (Cis)
KFB – Convenience Feature
KI – Instrument Cluster
KLA – Air Conditioning
KS – Knock Sensor
KSS – Knock Sensor System
LH – LH Sequential Fuel Management Bank 1 (1-6 or 1-8 Cylinders)
LH2 – LH Sequential Fuel Management Bank 2 (7-12 Cylinders)
LHS – Left Hand Steering
LLR – Cruise Control
LOC – Low Compression
LS – Loudspeaker System
MAF – Mass Air Flow
MAP – Manifold Absolute Pressure
ME – Motor Electronics
MIL – Malfunction Indicator
Lamp – (Check Engine)
MSC – Mirror, Steering Column Adjustment, Heated Mirrors
MT – Manual Transmission
MVA – Manifold Vacuum Assist
MWH – Main Wiring Harness
NS – Network System (CAN)
O2S – Oxygen (O2) Sensor
OBD – On-board Diagnostics
OC – Oxidation Catalytic Convertor
OCP – Over-head Control Panel
ORM – Outside Rearview Mirror
OSB – Orthopedic Seat Backrest
PL – Power Lock
PML – Speed-sensitive Power Steering
PMP – Partial Intake Manifold Preheater
PNP – Park/neutral Position
PS – Power Steering
PSE – Pneumatic System Equipment
PTS – Parktronic System
PW – Power Windows
PWM – Pulse Width Modulation
RB – Roll Bar Control
RCL – Remote Central Locking
RD – Radio
REST – Residual Engine Heat Utilization
RHR – Retractable Rear Head Restraints
RHS – Rear Heated Seats
RPM – Revolutions Per Minute (Engine Speed)
RST – Roadster Soft Top
RTG – Retractable Trunk Lid Grip
RTR – Remote Trunk Release
RV – Roadster Soft Top
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 (Airbag)
STH – Stationary Heater
TB – Throttle Body
TC – Turbo Charger
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
TS – Towing Sensor
TVV – Tank Ventilation Valve
TWC – Three Way Catalytic Convertor
ÜRB – Roll Bar Control
VAF – Volume Air Flow
VSS – Vehicle Speed Signal
WOT – Wide Open Throttle (Full Load)
WS – Wiper System

A – processed vehicle speed signal
A – “out” (Aus)
AB – Airbag
ABL – Brake system warning Lamp (2 color)
ABS – Anti-lock Braking System
AC – Air Conditioning (from ETK)
ACC – Active Cruise Control
ACS – Active Comfort Seats
ADB(X) – Automatic Differential Braking
ADS – engine intake air control
ADV – windshield wiper pressure control
AEGS – Automatic Electronic Gearbox Control (also EGS)
AFM – Air Flow Meter
AGD – suction silencer (from ETK)
AGR – emission reduction
AGS – Adaptive transmission control
AG – Automatic Gearbox (transmission)
AHK – Active rear-axle Kinematics
AHK – trailer hitch (from ETK)
AHM – trailer Module (not for US models)
AHPS – Advanced HPS
AIC – Automatic Interval Control (rain sensor)
AKF – activated carbon canister (from ETK)
AKS – Active head restraint
AKS – pressure regulating device (from ETK)
ALC – Automatic Light Control
ALR – Automatic Lamp Range Adjustment
AMM – Air Mass Meter
AMP – radio system AMPlifier
ARI – car radio information system (from ETK)
ARS – Active Roll Stabilization
ASC – All Season traction
ASC-EZA – ASC w/ engine timing and injection intervention
ASC+T – ASC+ Traction control
ASK – Audio System controller (Kontroller)
ASR – self starter block relay (from ETK)
AST – Automatic Slip control (marketing term)
AT – remanufactured part (from ETK)
AT – Antenna (from ETK)
ATF – Automatic Transmission Fluid (from ETK)
ATL – exhaust gas turbo charger (from ETK)
AUC – Automatic air recirculation
AUT – AUTomatic transmission (from ETK)
AVT – Antenna amplifier Tuner
AZD – tightening torque specifications (in TIS)

A/D – Analog/Digital
B – Benzene (gasoline)
BAT – BATtery (from ETK)
BC – Board Computer
BC1 – Body Controller 1
BL – Brake Light (from ETK)
BLS – Brake Light Switch
BMBT – Board Monitor
BS – Block diagram
BST – Battery Safety Terminal
BVA – Brake pad wear indicator (from ETK)
BZM – center console control center
BZMF – center console control center, rear

CAN – Controller Area Network (Multiple ECU Controller)
CAN-Bus – Controller Area Network (bus)
CANH-Bus – CAN bus, High
CANL-Bus – CAN bus, Low
CANP – fuel tank ventilation valve
CAS – Car Access System
CBC – Corner Braking Control
CBS – Condition Based Service
CCM – Check Control Module
CD – Control Display
CDC – Compact Disk Changer
CDS – CD player (from ETK)
CEL – CELsius (from ETK)
CIM – Chassis Integration Module
CO – Carbon monOxide (from ETK)

COMBI – Electronic Instrument Cluster
CON – CONtroller
CU – Copper (from ETK)
CVM – Convertible top Module
CVT – Constantly Variable Transmission
CW – drag coefficient (from ETK)
D1 – Xenon light/ gas discharge (from ETK)
D-Bus – Diagnosis bus (same as TXD)
DBC – Dynamic Brake Control
DBS – Dynamic Braking System
DCS – Dealer Communication System

DE – Diagnostic Unit
DD – Dynamic motor Drive
DDE – Digital Diesel Electronics
DIN – German industrial standards
DIS – Diagnosis and Information System
DISA – Differential air intake control
DIVA – continuously variable length intake runners
DK – throttle housing/valve
DKB – throttle w/ brake intervention

DKE – Throttle Increase
DKI – throttle position
DKR – throttle reduction
DKT – throttle position signal
DKV – preset throttle position value
DME – Digital Motor Electronics
DM-TL – Diagnostic Module Tank Leakage
DOHC – Double Over Head Camshafts (from ETK)
DS – gasket set (from ETK)
DSC – Dynamic Stability Control
DSP – Digital Sound Processing
DTC – Diagnostic Trouble Code (SAE)
DTC – Dynamic Traction Control
DWA – theft deterrent system
DWS – tire pressure Warning System
DZM – revolution counter (from ETK)
E – “in” (Ein)
EBA – installation instructions (from ETK)
EBV – Electronic Brake force proportioning
ECE – European market version (from ETK)
ECM – Engine Control Module (SAE term)
ECU – Electronic Control Unit
EDC – Electronic Damper Control (from ETK)
EDR – Electronic throttle control
E-KAT – Electrically heated catalytic converter
EZA – see ASC-EZA
ECM – Engine Control Module (SAE term)
ECO – Controller for I-Drive system
EDC – Electronic Dampening Control
EDC-K – Electronic Dampening Control – Continuous
EDK – Electronic throttle valve
EDS – pressure regulator
EFH – Electric window lifter (from ETK)
EGS – Electronic transmission control
EH – Electronic-Hydraulic
EHC – Electronic Height Control
EKM – Electronic body Module
EKP – Electric fuel Pump
ELV – Electronic steering lock
EM – Electro-Mechanical
EMF – Electro-Mechanical parking brake
EML – Electronic Motor Load regulation
EMV – Electro-Magnetic sensitivity (from ETK)
EO – component location
EPC – Electronic Parts Catalog (also ETK)
EPROM – Erasable/ Programmable chip Memory (from ETK)
ETK – Electronic parts catalog (also EPC)
ETM – Electrical Troubleshooting Manual
ESS – Electronic anti-theft device
EV – injection Valve
EWS – Electronic drive-away protection
FB – Function description
FBC – Fading Brake Control
FBD – remote control services
FBZV – radio frequency locking system

FGR – Vehicle Speed Control (Cruise Control)
FH – window lifter
FHK – rear Heater/ air conditioner
FLC – automatic Light Control
FRU – Flat Rate Unit

FS – Crash Sensor
FZV – central lock receiver
GAL – speed dependent sound volume
GM – General Module
GMR – yaw moment control
GPS – Global Positioning System
GRII – cruise control
GRS – rotation Rate Sensor

GS – Belt Tensioner
GWK – torque converter lock-up control
H – “rear” (Hinten)
H2 – Xenon headlights
HA – rear Axle (from ETK)
HC – Hydro Carbon
HD – Heavy Duty (from ETK)
HDC – Hill Decent Control
HFM – Hot Film air mass Meter
HG – manual Gearbox (transmission)
HKL – Hydraulic trunk lid Lift

HLM – Hot Wire Air Mass Meter
HPS – Head Protection System
HR – Heater control (from ETK)
HVA – Hydraulic Valve Adjuster (from ETK)

Hz – Hertz (Cycle)
I-Bus – Information bus
IB – Interior lighting control signal
IHKA – automatic Heating and A/C
IHKAF – IHKA w/ micro filter
IHKR – regulated Heating and A/C
IHKRF – IHKR w/ micro filter
IHKS – standard Heating and A/C
IHPD – Internal High Pressure Deformation
IHR – Integrated Heater control (from ETK)
IKE – Instrument cluster Electronics
ILH – Interior Lighting, rear
ILV – Interior Lighting, front
IMS – Instant Mobility System (from ETK)
IR – Infrared

IRS – Infrared Locking System

ISC – Idle Speed Control
ISIS – Intelligent Safety Integration System
ISN – Individual Serial Number
ISOFIX – standardized mounts for child restraints
ITS – head airbag assembly/ Inflatable Tubular Structure
IVM – Integrated power supply Module
K-Bus – body bus (Karosserie)
KAT – catalytic converter
KATON – converter creating (signal)
KD – Kick-Down
KHI – interface for headphones
KL – terminal designation
KL15 – run bus (ignition switch run position)
KL30 – battery bus (hot at all times)
KL31 – ground bus (chassis ground)
KL50 – start bus (ignition start position)
KLR – accessory bus
KO – compressor “on” signal
KOMBI – instrument cluster
KOREL – compressor relay signal

KR – Contact Ring
KSK – Knock Sensor
KVA – fuel consumption signal/value
KW – crankshaft
KW – KiloWatt (from ETK)
LCM – Lamp Check Module
LDP – Leak Diagnosis Pump
LEV – Low Emissions Vehicle
LEW – Lateral acceleration sensor
LHD – Left-Hand Drive (from ETK)
LKM – Lamp control Module
LL – closed throttle
LM – Light Module
LMM – air flow meter/sensor
LMR – Light alloy wheel
LRA – vertical headlight aiming
LSM – steering column memory
LSZ – Lamp Switching center
LVA – air supply system (for EHC system)
LWR – vertical headlight aim control
LWS-5 – steering angle sensor
M-Bus – IHKA/IHKR stepper motor bus
MAL – center armrest
MBC – Maximum Brake Control
MDK – Motorized throttle valve/system
MFL – Multi-Function steering wheel
MFC – Multi-Function Controller
MFU – Multi-Function Clock
MID – Multi-Information Display
MIL – Malfunction Indicator Lamp (SAE), “check engine” Lamp
MIR – Multi-Information Radio
MMC – Multi-Media Changer
MoDiC – Mobile Diagnostic Computer
MOST-Bus – Media Oriented System Transport bus
MRS – Multiple Restraint System
MSR – engine drag torque Regulation
MV – Magnetic Valve (solenoid Valve)
n-ab – rotational speed, transmission (rpm)
n-mot – rotational speed, engine (rpm)
NAVI – Navigation module
NG – New Generation (as in N73 engine)
NG – tilt sensor
NOX – Nitrogen Oxides/ exhaust gas recirculation (from ETK)
NSD – rear muffler (from ETK)
NSL – rear fog Lamp (from ETK)
NSW – fog lamp (from ETK)
NTC – Negative Temperature Coefficient
NW – camshaft (from ETK)
OBC – On-Board Computer
OBD – On-Board Diagnosis (SAE)

P/N – Park/Neutral position
P-Bus – Periphery bus
PB – Pin assignments
PBS – Parts Bulletin System (in TIS)
PDC – Park Distance Control
PGS – Passive Go System
PM – Power Module

PP – Impact Pad
PTC – Positive Temperature Coefficient
RLS – Rain-Light Sensor
PWG – Pedal position sensor/ potentiometer
RA – Repair instructions (in TIS)

RAM – Random Access Memory
RAL – Aluminum wheels (from ETK)
RAL – standard color (from ETK)
RDC – tire pressure Control
RDS – Radio Data-broadcast System
RDW – tire pressure Warning
RHD – Right-Hand Drive (from ETK)
RM – Relay Module
ROZ – Research Octane rating/ fuel grade (from ETK)
RPA – tire puncture warning (from ETK)
RPS – Rollover Protection System
RS – Repair kit (from ETK)
RSW – back-up lamp (from ETK)
RXD – wake-up Diagnosis line
RZV – direct stationary ignition
SASL – Satellite, A-pillar left
SASR – Satellite, A-pillar right
SAV – Sport ACTIVITY Vehicle
SB – fuse assignments
SBE – Seat occupancy detector/sensor
SBFH – Seat module, passenger-side rear
SBSL – Satellite, B-pillar left
SBSR – Satellite, B-pillar right
SBT – SI techniques/ tech reference information (in TIS)
SCA – Soft Close Automatic/Actuator
SD – sliding roof (from ETK)
SD – silencer/ muffler (from ETK)
SE – Special Equipment (from ETK)
SES – voice recognition System
SFAH – Seat module, driver’s side rear
SFZ – Satellite, vehicle center
SG – control unit
SGS – Seat integrated belt System
SHD – sliding/ lifting roof (from ETK)
SHD – Sunroof module (also SHDM)
SI – Service Information (in TIS)
SIA – Service Interval system (ver. I, II, III, IV, etc.)
SII – Service Interval Indicator
SIL – SILicon (from ETK)
SIM – Safety Information Module
SINE – Siren/tilt sensor
SKD – Steel sliding roof (from ETK)
SKHD – Steel sliding/ lifting roof (from ETK)
SM – Seat Module
SM/SPM – Seat/Mirror Memory
SMBF – Seat Module, passenger side
SMFA – Seat Module, driver’s side
SMG – Sequential Manual Gearbox
SP – Schematic
SRA – headlight/fog light cleaning
SRS – Supplementary Restraint System
SSD – Steel sliding roof (from ETK)
SSH – Seat Satellite, rear seat
ST – connector views
Steptronic – transmission shift control
STVL – Satellite, left front door
STVR – Satellite, right front door
SVS – Speech processing System
SWR – headlamp cleaning system (from ETK)
SWZ – Special tool listings (in TIS)
SZL – Switch center, steering column
SZM – central switch center Module
TAGE – door handle Electronics
TCM – Transmission Control Module
TD – engine speed signal (ignition pulse)
TD – Technical Data (in TIS)
TE – fuel evaporation control
TEL – TELephone control unit
TEV – evaporative purge control
THZ – Tandem master cylinder (from ETK)
ti – Injector “on” Time (duration)
TIS – Technical Information System
TL – part throttle / load signal
TLEV – Transitional Low Emission Vehicle
TMBFT – door Module, passenger side
TMBFTH – door Module, passenger side rear
TMFAT – door Module, driver’s side
TMFATH – door Module, driver’s side rear
TP – Tandem Pump (from ETK)
TPS – Throttle Position Switch/Sensor
TR – engine speed signal (rpm)
TR – TRansistor (from ETK)
TRG – fuel level sensor (from ETK)
TRI – Technical Reference Information (also SBT)
TRS – battery isolation Switch
TSD – Torsional vibration dampener (from ETK)
TSH – door lock Heating
TSZI – Transistorized coil Ignition system (from ETK)
TU – Technical Update (as in M50tu)
TXD – Transmitting Diagnosis line
U-batt – Battery voltage
U-vers – supply voltage
UERSS – rollover bar (from ETK)
URS – rollover protection System
USIS – Ultrasonic passenger compartment Sensor
V – “front” (Vorn)
V – vehicle road speed
VA – front Axle (from ETK)
VAT – front axle support (from ETK)
VANOS – Variable camshaft timing
VEP – distributor-type injection Pump (from ETK)
VID – VIDeo module
VL – full load (wide open throttle)
VSD – front muffler (from ETK)
VVT – Valve tronic
WBG – hazard warning switch (from ETK)
WIM – Wiper control Module
WK – torque converter lock-up clutch
WSS – Wind Shield (from ETK)
WT – Valve tronic control unit
Z – “central” (Zentrum)
ZAB – ignition fade-out (reduction)
ZAE – central Airbag Electronics
ZAS – ignition starter switch (from ETK)
ZGM – central Gateway Module
ZK – cylinder head (from ETK)
ZKE – central body Electronics
ZKH – cylinder head cover (from ETK)
ZMS – dual-Mass flywheel (from ETK)
ZV – central locking system
ZS – central lock (from ETK)
ZSD – center muffler (from ETK)
ZV – central locking system (from ETK)
ZVM – central locking Module
ZWD – idle control valve