Control Modules In The Control Area Network (CAN)
The number of control modules in the CAN network varies depending on the car model, equipment level and structure week, The structure week and construction week are not necessarily the same week. The construction week is the week in which the vehicle is built in the factory. The content of the vehicle is steered towards structure week. A structure week may extend over a number of construction weeks. Structure weeks are specified in the format YYYYWW.
For example, structure week 199815 indicates that the structure week of the vehicle is week 15, year 1998.
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) |
| HS CAN | = | CAN High Speed Section (500 kbit/s) |
| Serial | = | Serial communication (Volcano Lite) between the slave control module and the CAN control module (10.4 kbit/s). LIN (9.6 kbit/s). |
| Slave control module | = | A control module with low computing power which is connected to a main "control module" and which only operates on commands from the main control module. |
| Option | = | Accessories installed at the factory to order, when purchasing a new car. |
| Accessories | = | Aftermarket installation. |
| Control module | Name/ Function | Network | Miscellaneous |
| AEM | Accessory electronic module (AEM) Controls certain accessory functions for the vehicle, This control module communicates with other control modules via the low speed side of the network. |
LS CAN | Accessories |
| Audio control module | Audio module (AUM) Controls the radio / audio equipment and communicates with the other modules via the network low speed sector. |
LS CAN | Standard/ accessory/option. |
| Brake control module | Brake control module (BCM) Controls the ABS/EBD/DSTC/STC functions of the brake system and communicates with the other modules via the network high speed sector. Contains a terminating resistor for the network. |
HS CAN | |
| Climate control module | Climate control module (CCM) Controls the climate control system functions and communicates with the other modules via the network low speed sector. |
LS CAN | STD/ MCC/ ECC |
| Central electronic module | Central electronic module (CEM) This is the network's main control module and the interface between the high and low speed sides. The control module has a comprehensive function in the electrical system and handles a large number of functions. |
HS CAN/LS CAN | |
| DDM | Driver door module (DDM) Controls the drivers door functions and communicates with the other modules via the network low speed side. |
LS CAN | |
| DEM | Differential electronic module (DEM) Controls four wheel drive engagement and communicates with the other modules via the network high speed side. |
HS CAN | Option. |
| Driver information module | Driver information module (DIM) Controls the combined instrument panel functions and communicates with the other modules via the network low speed side. |
LS CAN | |
| ECM | Engine control module (ECM) Controls the engine's functions and communicates with other control modules via the high speed side of the network. Contains a terminating resistor for the high speed side of the network. |
HS CAN | Different versions depending on the engine alternative. |
| PDM | Passenger door module (PDM) Controls the functions in the passenger side door and communicates with the other modules via the network low speed side. |
LS CAN | |
| Carphone module | Phone module (PHM) Controls the functions of the carphone and communicates with the other modules via the network low speed side. |
LS CAN | Option / accessory. |
| Power seat module | Power seat module (PSM) Controls the positions and functions of the driver's seat. Communicates with other control modules via the low speed side on the network. |
LS CAN | Standard/ option
NOTE:
The power seat module (PSM) does not check seat heating and SIPS (side impact protection system) airbag function. |
| REM | Rear electronic module (REM) Controls the electrical functions in the rear section of the vehicle, and communicates with the other modules via the low speed side on the network. Contains a terminating resistor for the network. |
LS CAN | |
| RTI | Road traffic information module (RTI) Controls the road traffic information functions and communicates with the other modules via the low speed side on the network. |
LS CAN | Option /accessory |
| Steering angle sensor | Steering wheel angle sensor module (SAS) Collects information about the steering angle and communicates with other control modules using the high speed side on the network. |
HS CAN | Option. Used in the DSTC system. |
| SRS | Supplemental restraint system module (SRS) Controls the vehicle's crash safety system and communicates with the other modules via the low speed side on the network. |
LS CAN | |
| SUM | Suspension module (SUM) This control module handles the Four-C (Continuously Controlled Chassis Concept) function, i.e. constantly regulates damping in the shock absorbers. Communicates with other control modules via the high speed side on the network. |
HS CAN | Option. Not XC90. |
| TCM | Transmission control module (TCM) Controls the automatic gearbox and communicates with the other modules via the high speed side on the network. |
HS CAN | Vehicles with automatic transmission only. |
| Upper electronic module | Upper electronic module (UEM) Controls the electrical functions in the upper part of the passenger compartment. Also includes remote control receivers. Communicates with other control modules via the low speed side on the network. Contains a terminating resistor for the network. |
LS CAN | Included in the interior rear view mirror.
NOTE:
There are two types of upper electronic module (UEM): one with an automatic dip function, and one without. |