Control Modules In Control Area Network (Can)

Fig 1: Identifying Control Modules In The Control Area Network (CAN)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The number of control modules in the CAN varies depending on the level of equipment, the vehicle model and the structure week.

NOTE:

To troubleshoot respective CAN-net, see troubleshooting for CAN-related diagnostic trouble codes for Central electronic module (CEM). For example, choose any of CEM-DF01 - DF17 depending on CAN-net.

Explanation
LS CAN	=	CAN Low speed section (125 kbit/s). Contains the control modules located in the passenger compartment and cargo compartment.
HS CAN	=	CAN High speed section (500 kbit/s). Contains the control modules located in the engine compartment.
Slave control module	=	A control module with low computing power which is connected to a "master control module" and which only operates on commands from the master control module.
Option	=	Accessories installed at the factory to order, when purchasing a new car.
Accessories	=	Aftermarket installation.

Control module	Name/ Function	Network	Miscellaneous
ADM	Additive dosing module (ADM) Controls the dosage of the fuel additive to the main fuel tank (diesel).	HS CAN	Diesel engines only
AEM	Accessory electronic module (AEM) Controls certain accessory functions for the vehicle. The interface for a non-Volvo aftermarket alarm for example.	LS CAN	Accessories
BCM	Brake control module (BCM) Regulates brake system functions (ABS-/EBD-/STC-/DSTC)	HS CAN	Has body sensor cluster stability sensor (BSC) as slave module.
CCM	Climate control module (CCM) Controls the climate control system functions and communicates with the other modules via the network low speed sector.	-	-
CEM	Central electronic module (CEM) Is the network main control module and the interface between the high and low speed sides. The control module has an overall function in the electrical system.	HS CAN / LS CAN	-
CPM	Combustion preheater module (CPM) Controls the parking heater function.	LS CAN	Option /accessory. Market dependent
DDM	Driver's door module (DDM) Controls the driver's door functions and certain functions in the other doors.	LS CAN	-
DEM	Differential electronic module (DEM) Controls four wheel drive engagement and communicates with the other modules via the high speed side of the network.	HS CAN	Vehicles with AWD only.
DIM	Driver information module (DIM) Controls combined instrument panel functions. The control module contains one of the two terminal resistors for LS CAN.	LS CAN	-
ECM	Engine control module (ECM) Controls engine functions. The control module contains one of the two terminal resistors for HS CAN.	HS CAN	Different versions depending on the engine alternative.
EPS	Electronic power steering module (EPS) Controls power steering function.	HS CAN	-
ICM	Infotainment control module (ICM) Controls audio and navigation functions. The control module is also the main control module in the MOST network.	LS CAN (MOST)	For further information regarding the MOST network, see Design and Function, MOST.
KVM	Keyless vehicle module (KVM) Controls functions for the keyless entry system.	LS CAN	Option
PAM	Parking assistance module (PAM) Controls functions for the parking assistance system.	LS CAN	Option /accessory
PDM	Passenger door module (PDM) Controls functions in the passenger side door.	LS CAN	-
PHM	Phone module (PHM) Controls phone functions. Part of the infotainment system.	LS CAN (MOST)	Option / accessory. Available in various configurations.
PSM	Power seat module (PSM) Controls the positions and functions of the driver's seat.	LS CAN	Standard / option NOTE: The power seat module (PSM) does not control seat heating or the SIPS airbag function.
SRS	Supplemental restraint system module (SRS) Controls the vehicles supplemental restraint system. The control module contains one of the two terminal resistors for LS CAN.	LS CAN	Has occupant weight sensor (OWS) as slave module to check whether anyone is sitting in the passenger seat.
SWM	Steering wheel module (SWM) Receives signals from the switch in the steering wheel and from the controls around the steering wheel. The control module contains one of two terminal resistors for HS CAN.	HS CAN	-
TCM	Transmission control module (TCM) Controls the automatic transmission function.	HS CAN	Vehicles with automatic transmission only.
TRM	Trailer module (TRM) Controls trailer functions.	LS CAN	Option Applies only to cars with a tow hitch.