Acronyms

ECU – Engine Control Unit
ECM – Engine Control Module
PCM – Powertrain Control Module
BCM – Body Control Module
TCM – Transmission Control Module
ABS – Anti-lock Brake System Module
SRS – Supplemental Restraint System (Airbag) Module
EPS – Electronic Power Steering Module
ECU – Electronic Control Unit (generic term for any module)
HVAC – Heating, Ventilation, and Air Conditioning Control Module
CCM – Central Control Module / Climate Control Module (context-dependent)
EBCM – Electronic Brake Control Module
FICM – Fuel Injection Control Module
GEM – Generic Electronic Module
ICM – Ignition Control Module
IMM / IMMO – Immobilizer Control Module
DSM – Driver Seat Module / Door Switch Module
DDM – Driver Door Module
PDM – Passenger Door Module
RDM – Rear Door Module / Rear Differential Module (context-dependent)
VCM – Vehicle Control Module
SCM – Steering Column Module
ACM – Audio Control Module / Airbag Control Module (depends on make)
RCM – Restraints Control Module
IPM – Instrument Panel Module
CEM – Central Electronic Module (Volvo, Saab, etc.)
REM – Rear Electronic Module
EWS – Electronic Immobilizer System (BMW)
DME – Digital Motor Electronics (BMW / Mini)
DDE – Digital Diesel Electronics (BMW diesel)
ECAS – Electronically Controlled Air Suspension Module
TCU – Transmission Control Unit
HCU – Hydraulic Control Unit (often part of ABS)
FCM – Front Control Module
TIPM – Totally Integrated Power Module (Chrysler)
SAM – Signal Acquisition Module (Mercedes)
UEM – Upper Electronic Module (Volvo)
PEM – Pump Electronic Module (Volvo fuel systems)
IPDM – Intelligent Power Distribution Module (Nissan / Infiniti)
SGM – Safety Gateway Module (BMW)
ZGM – Central Gateway Module (Mercedes / BMW)
KOMBI – Instrument Cluster Module (BMW)
TCU – Telematics Control Unit
EIS – Electronic Ignition Switch (Mercedes)
ECAS – Electronic Controlled Air Suspension

OEM – Original Equipment Manufacturer