System overview: Signals
The following chart summarizes the input signals to and the output signals from the central electronic module (CEM). The signal types are divided into directly connected signals, serial communication and Controller area network (CAN) communication. The following illustration displays the same information with the Volvo component designations.
| Input signals | Output signals |
| Directly connected: | Directly connected: |
| Back-up (reversing) lamp (3/10) | Starter motor, relay (x2) (6/25) |
| Windshield wiper motor (6/1) | Stepper motor, power steering (x 4) (6/71) |
| Windshield washer level sensor (7/5) | Headlamp range adjustment (6/38) |
| Control signal doors / tailgate (x 8) (3/74) | Windshield wiper, relay (x2) (6/1) |
| Horn switch (3/37) | Washer motor, relay (x 2) (6/2) |
| Stop lamp switch (3/9) | Horn, relay (16/10) |
| Seat belt buckle sensor (x 4) (3/93) | Stop lamps from the rear electronic module (REM) (4/58) |
| Fuel pump frequency signal (4/46) | High level stop lamp (S60/S80) (10/19) |
| Control signal, gear selector lever module P/N-position (3/156) | Fuel pump, relay (6/33) |
| Supplemental restraint system module (SRS) (Airbag OK) (4/9) | Hazard warning signal flasher switch (3/6) |
| Gear-shift position sensor (8/37) | Glove compartment lighting (10/29) |
| Immobilizer (x 2) (16/65) | Ignition switch lighting (16/65) |
| Hazard warning signal flasher switch (3/6) | Alarm LED (7/12) |
| Glass breakage sensor (7/136) | Courtesy lighting (10/122) |
| L signal (generator) (6/26) | 12V socket (9/25) |
| Auxiliary lamps (10/65) | |
| Via serial communication: | Via serial communication: |
| Additional heater / parking heater (optional extra) (4/7) | Additional heater / parking heater (optional extra) (4/7) |
| Light switch (3/111) | Light switch (3/111) |
| Heated seats (4/201) | Heated seats (4/201) |
| Communication line (data link connector) (17/13) | Communication line (data link connector) (17/13) |
| Via Controller Area Network (CAN) communication: | Via Controller Area Network (CAN) communication: |
| Accessory electronic module (AEM) (optional equipment) (4/78) | Accessory electronic module (AEM) (optional equipment) (4/78) |
| Audio module (AUM) (16/1) | Audio module (AUM) (16/1) |
| Brake control module (BCM) / Anti-lock Brake System Module (ABS) (4/16) | Brake control module (BCM) / Anti-lock Brake System Module (ABS) (4/16) |
| Climate control module (CCM) (3/112) | Climate control module (CCM) (3/112) |
| Driver's door module (DDM) (3/126) | Driver's door module (DDM) (3/126) |
| Differential electronic module (DEM) (optional equipment) (4/82) | Differential electronic module (DEM) (optional equipment) (4/82) |
| Driver information module (DIM) (5/1) | Driver information module (DIM) (5/1) |
| Engine control module (ECM) (4/46) | Engine control module (ECM) (4/46) |
| Electronic throttle module (ETM) (4/50) | Electronic throttle module (ETM) (4/50) |
| Passenger door module (PDM) (3/127) | Passenger door module (PDM) (3/127) |
| Phone module (PHM) (optional equipment) (16/60) | Phone module (PHM) (optional equipment) (16/60) |
| Power seat module (PSM) (4/52) | Power seat module (PSM) (4/52) |
| Rear electronic module (REM) (4/58) | Rear electronic module (REM) (4/58) |
| Road Traffic Information Module (RTI) (optional extra) (16/45) | Road Traffic Information Module (RTI) (optional extra) (16/45) |
| Steering wheel angle sensor module (SAS) (4/68) | Steering wheel angle sensor module (SAS) (4/68) |
| Supplemental Restraint System Module (SRS) (4/9) | Supplemental Restraint System Module (SRS) (4/9) |
| Steering wheel module (SWM) (3/130) | Steering wheel module (SWM) (3/130) |
| Transmission control module (TCM) (4/28) | Transmission control module (TCM) (4/28) |
| Upper electronic module (UEM) (4/70) | Upper electronic module (UEM) (4/70) |
| Data link connector (DLC) (17/13) | Data link connector (DLC) (17/13) |