System Overview: Signals

The table below summarizes the input signals to and 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.

Input signals	Output signals
Directly connected:	Directly connected:
Horn switch Tailgate, unlocking (XC60 or vehicles without keyless entry) Stop lamp switch Control signal for doors/hatches (x6) Blower fan, re-supply Twilight sensor Sun sensor Fuel level sensor Fuel level sensor (AWD) Seat belt buckle sensor, rear (x3) Supplemental Restraint System Module (SRS), collision output signal Hazard warning signal flasher switch Dip switch Sun roof speed signal Washer fluid level sensor Coolant level switch Fuel pump, re-supply Brake fluid level switch Reverse gear sensor Parking brake switch Clutch pedal sensor, external (gasoline engine with manual transmission) Accelerator pedal position sensor (analogue signal) Stop lamp switch Brake light diagnostic switch Outside temperature gauge Light switch module (LSM) Driver information module - activation of power supply to steering wheel lock Start control module (SCU), switch at start button (not S60 (11-), V60, XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Ignition antenna unit (IAU) (for S60 (11-), V60, XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Secondary battery (model year 2011-, only on vehicles with the function automatic start/stop of engine). Position sensor for headlamp range adjustment, (7/119, 7/121), (model year 2012-)	Parking lamps License plate lighting Brake light Dipped beam Passenger compartment lighting Fog tail lamps Hazard warning signal flasher indicator lamp Shift lock High level stop lamp Seat belt reminder Fuel tank filler cap, unlocking Turn signal lamps Malfunction indicator lamp (MIL). Alarm LED Movement sensor (IMS), voltage supply Mass Movement Sensor Module (MMS) (only XC60 with panorama roof), voltage supply Steering Column Lock Module (SCL), wake-up (does not apply to USA/CDN market for 2009-). Engine control module (ECM), stimulation Dimmer switch, instrument lighting Trunk lid, unlocking Receiver, power supply Sun roof, closing signal Frequency signal, electrical additional heater Frequency signal blower fan Indicator lamp, deadlock Passenger seat sensor, supply voltage Fuel pump High beam Windshield washer Rear window washer (V70/XC70/XC60) Rear window wiper (V70/XC70/XC60) Rear demist Extended voltage feed Passenger compartment lighting (power supply) Back-up lamp Front fog lights Headlamp washers Horn Accelerator pedal position sensor, power supply Alcolock, voltage supply (option 2008-) Unit for speed-dependent power steering
Via serial communication:	Via serial communication:
Remote control receiver Rain sensor module (RSM) (optional extra) Steering Column Lock Module (SCL) (does not apply to USA/CDN market for 2009-). Siren (optional equipment) Start control module (SCU) (not S60 (11-), V60, XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Ignition antenna unit (IAU) (for S60 (11-), V60, XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Wiper motor module (WMM) Light switch module (LSM) Movement sensor (IMS) Mass Movement Sensor Module (MMS) (only XC60 with panorama roof) Steering wheel module (SWM) Battery monitoring module (7/240), with signals on battery status (main battery). Only in vehicles with the brake energy regeneration function. BLind spot Information System (BLIS) (only S60 (11-)/V60) Left headlamp control unit (LHCU) (model year 2012-) Right headlamp control unit (RHCU) (model year 2012-)	Remote control receiver Rain sensor module (RSM) (optional extra) Steering Column Lock Module (SCL) (does not apply to USA/CDN market for 2009-). Siren (optional equipment) Start control module (SCU) (not S60 (11-), V60, XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Ignition antenna unit (IAU) (for S60 (11-), V60, XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Wiper motor module (WMM) Sun roof module (SRM) Light switch module (LSM) Movement sensor (IMS) Mass Movement Sensor Module (MMS) (only XC60 with panorama roof) Steering wheel module (SWM) Battery monitoring module (7/240), with signals on ignition key position and diagnostics commands. Only in vehicles with the brake energy regeneration function. BLind spot Information System (BLIS) (only S60 (11-)/V60) Left headlamp control unit (LHCU) (model year 2012-) Right headlamp control unit (RHCU) (model year 2012-)
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Brake control module (BCM) Climate control module (CCM) Combustion preheater module (CPM) (optional extra) Driver door module (DDM) Driver information module (DIM) Engine control module (ECM) Infotainment control module (ICM) Passenger door module (PDM) Phone module (PHM) (optional extra) Power seat module (PSM) (optional extra) Supplemental restraint system module (SRS) Transmission control module (TCM) (optional extra) Trailer module (TRM) (optional extra). Keyless vehicle module (KVM) (optional equipment) High Level Display Front (HLDF) (not XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Suspension module (SUM) Forward Sensing Module (FSM) Park Brake Module (PBM) Differential electronic module (DEM) Headlamp Control Module (HCM) (model year -2011) Power Operated Tailgate Module (POT) (V70/XC70/XC60) Closing velocity module (CVM) (XC60, S80/S80L/V70/XC70 (model year 2012-))	Brake control module (BCM) Climate control module (CCM) Combustion preheater module (CPM) (optional extra) Driver door module (DDM) Driver information module (DIM) Engine control module (ECM) Infotainment control module (ICM) Passenger door module (PDM) Phone module (PHM) (optional extra) Power seat module (PSM) (optional extra) Supplemental restraint system module (SRS) Transmission control module (TCM) (optional extra) Trailer module (TRM) (optional extra). Keyless vehicle module (KVM) (optional equipment) High Level Display Front (HLDF) (not XC60 (structure week 201046-), S80/S80L/V70/XC70 (model year 2012-)) Suspension module (SUM) Forward Sensing Module (FSM) Park Brake Module (PBM) Differential electronic module (DEM) Headlamp Control Module (HCM) (model year -2011) Power Operated Tailgate Module (POT) (V70/XC70/XC60) Closing velocity module (CVM) (XC60, S80/S80L/V70/XC70 (model year 2012-))