Signal Specification
NOTE:
Signal description for CEM generation 2 (structure week >= 09w46) see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM)
All values given below are between the terminals stated in column 1 and terminal #D5 (power ground). This applies unless otherwise indicated in the last column.
NOTE:
It is important to connect the breakout box and check the ground connections before starting to measure.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds |
| PWM = | Pulse-width modulated signal in % | - | - |
SIGNAL TABLE
| Connector C1 (Green) | |||||
|---|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Ignition off Active/Not active |
Ignition on Active/Not active |
Miscellaneous |
| #A1 | #C1:1 | Front right-hand turn signal lamp, power supply | U = 0 V | U=Ubat /u V | - |
| #A2 | #C1:2 | Reserve | - | - | - |
| #A3 | #C1:3 | Reserve | - | - | - |
| #A4 | #C1:4 | Reserve | - | - | - |
| #A5 | #C1:5 | Reserve | - | - | - |
| #A6 | #C1:6 | Reserve | - | - | - |
| #A7 | #C1:7 | Auxiliary light relay, control signal | U = 0 V | U=Ubat /U=0 V | Extra accessory |
| #A8 | #C1:8 | Reserve | - | - | - |
| #A9 | #C1:9 | Reserve | - | - | - |
| #A10 | #C1:10 | Front left parking lamp, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #A11 | #C1:11 | Engine coolant level sensor, input signal | Ulow at normal level; Ubat at low level | - | |
| #A12 | #C1:12 | Reserve | - | - | - |
| #A13 | #C1:13 | Front left parking lamp, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #A14 | #C1:14 | Sun sensor 2 (right) | - | - | - |
| #A15 | #C1:15 | Reserve | - | - | - |
| #A16 | #C1:16 | Reserve | - | - | - |
| #A17 | #C1:17 | Electronic power steering module, signal supply | Ubat at ignition in position II; Ulow otherwise | - | |
| #A18 | #C1:18 | Reserve | - | - | - |
| #A19 | #C1:19 | Front left-hand turn signal lamp, power supply | Ulow | Ubat -Ulow /Ulow | - |
| #A20 | #C1:20 | Reserve | - | - | - |
| #A21 | #C1:21 | Reserve | - | - | - |
| #A22 | #C1:22 | Reserve | - | - | - |
| #A23 | #C1:23 | Hood switch | Ulow
with the hood closed Ulow -Ubat with the hood open |
Pulsed signal, f= 100 Hz | |
| #A24 | #C1:24 | Reserve | - | - | - |
| #A25 | #C1:25 | Switch, washer fluid level | Ulow at normal level; Ubat at levels below 1 liter | - | |
| #A26 | #C1:26 | Reversing switch, input signal | - | - | - |
| #A27 | #C1:27 | Switch, brake fluid level | Ulow at normal level; Ubat at low level | - | |
| #A28 | #C1:28 | Spare | - | - | - |
| #A29 | #C1:29 | Reserve | - | - | - |
| #A30 | #C1:30 | Reserve | - | - | - |
| #A31 | #C1:31 | Reserve | - | - | - |
| #A32 | #C1:32 | Reserve | - | - | - |
| #A33 | #C1:33 | Reserve | - | - | - |
| #A34 | #C1:34 | Reserve | - | - | - |
| #A35 | #C1:35 | Communication LIN bus 2 | During communication the voltage is 0 V - Ubat | BBS | |
| #A36 | #C1:36 | Communication LIN bus 2 | During communication the voltage is 0 V - Ubat | WMM | |
| #A37 | #C1:37 | Brake light switch, input signal | Ulow | Ulow / Ubat | - |
| #A38 | #C1:38 | Reserve | - | - | - |
| #A39 | #C1:39 | Reserve | - | - | - |
| #A40 | #C1:40 | Front right-hand parking lamp, signal | Ubat /Ulow | Ubat /Ulow | - |
| #A41 | #C1:41 | Front right-hand parking lamp, power supply | - | - | - |
| #A42 | #C1:42 | Reserve | - | - | - |
| #A43 | #C1:43 | Reserve | - | - | - |
| #A44 | #C1:44 | Engine control module (ECM), waking | Ulow | Ubat /Ulow | - |
| #A45 | #C1:45 | 15 supply | Ulow | Ubat | - |
| #A46 | #C1:46 | Relay, horn, control signal | Ulow / Ubat | Ulow / Ubat | - |
| #A47 | #C1:47 | Headlamp cleaning, control signal | Ubat | Ulow / Ubat | - |
| #A48 | #C1:48 | Comfort relay, control signal | Ulow | Ubat /Ulow | - |
| #A49 | #C1:49 | Communication CAN H Low speed bus |
During communication the voltage is 2.0-3.5 V | - | |
| #A50 | #C1:50 | Communication CAN L Low speed bus |
During communication the voltage is 1.5-2.5 V | - | |
| #A51 | #C1:51 | Clutch pedal sensor, external, voltage supply | Ulow | U =5 V | - |
| #A52 | #C1:52 | Clutch pedal sensor, external, signal | - | - | - |
| #A53 | #C1:53 | Clutch pedal sensor, external, ground | Ulow | Ulow | - |
| #A54 | #C1:54 | Electronic ground | U = Ulow | U = Ulow | - |
| #A55 | #C1:55 | 15-feed, BCM and accelerator pedal | Ulow | Ubat | - |
| #A56 | #C1:56 | Reserve | - | - | - |
| #A57 | #C1:57 | Reserve | - | - | - |
| #A58 | #C1:58 | Reserve | - | - | - |
| #A59 | #C1:59 | Reserve | - | - | - |
| #A60 | #C1:60 | Reserve | - | - | - |
| #B1 | #C1:61 | Reserve | - | - | - |
| #B2 | #C1:62 | Reserve | - | - | - |
| #B3 | #C1:63 | Reserve | - | - | - |
| #B4 | #C1:64 | 15-power supply | Ulow | Ubat | - |
| #B5 | #C1:65 | 15-power supply | Ulow | Ubat | - |
| #B6 | #C1:66 | Reserve | - | - | - |
| #B7 | #C1:67 | BBS, power supply | Ulow | Ubat | - |
| #B8 | #C1:68 | Front right fog lamp, power supply | Ulow | Ubat /Ulow | - |
| #B9 | #C1:69 | Front left fog lamp, power supply | Ulow | Ubat /Ulow | - |
| #B10 | #C1:70 | Reserve | - | - | - |
| #B11 | #C1:71 | Front washer motor, power supply | - | - | - |
| #B12 | #C1:72 | Front washer motor, ground | U = Ulow | U = Ulow | - |
| #B13 | #C1:73 | Right high beam, power supply | Ulow | Ubat /Ulow | - |
| #B14 | #C1:74 | Left high beam, power supply | Ulow | Ubat /Ulow | - |
| #B15 | #C1:75 | Right low beam, power supply | Ulow | Ubat /Ulow | - |
| #B16 | #C1:76 | Left low beam, power supply | Ulow | Ubat /Ulow | - |
| Connector C2 (Brown) | |||||
|---|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Ignition off Active/Not active |
Ignition on Active/Not active |
Miscellaneous |
| #C1 | #C2:1 | Reserve | - | - | - |
| #C2 | #C2:2 | Reserve | - | - | - |
| #C3 | #C2:3 | Reserve | - | - | - |
| #C4 | #C2:4 | Reserve | - | - | - |
| #C5 | #C2:5 | Reserve | - | - | - |
| #C6 | #C2:6 | Switch right front door, check signal | Ubat if the door is open; Ulow otherwise | - | |
| #C7 | #C2:7 | Switch left front door, check signal | Ubat if the door is open; Ulow otherwise | - | |
| #C8 | #C2:8 | Switch right-hand rear door, check signal | Ubat if the door is open; Ulow otherwise | - | |
| #C9 | #C2:9 | Switch left-hand rear door, check signal | Ubat if the door is open; Ulow otherwise | - | |
| #C10 | #C2:10 | Switch trunk lid/tailgate, check signal | Ubat if the trunk lid/tailgate is open; Ulow otherwise | - | |
| #C11 | #C2:11 | Accelerator pedal (AP) position sensor, power supply | Ulow | U = 5 V | - |
| #C12 | #C2:12 | Brake lamp switch | Ulow | Ubat /Ulow | - |
| #C13 | #C2:13 | Trunk lid/tailgate handle | - | - | - |
| #C14 | #C2:14 | Reserve | - | - | - |
| #C15 | #C2:15 | Reserve | - | - | - |
| #C16 | #C2:16 | Reserve | - | - | - |
| #C17 | #C2:17 | Communication LIN bus 0 | During communication the voltage is 0 V - Ubat | - | |
| #C18 | #C2:18 | Rear right turn signal lamp, power supply | Ulow | Ubat -Ulow /Ulow | - |
| #C19 | #C2:19 | Reserve | - | - | - |
| #C20 | #C2:20 | Seat belt reminder sensor, rear left, input signal | Ulow | U = 0-5 V | - |
| #C21 | #C2:21 | Seat belt reminder sensor, rear center, input signal | Ulow | U = 0-5 V | - |
| #C22 | #C2:22 | Seat belt reminder sensor, rear right, input signal | Ulow | U = 0-5 V | - |
| #C23 | #C2:23 | Seat belt reminder sensor, passenger seat, input signal | Ulow | U = 0-5 V | - |
| #C24 | #C2:24 | Rear right parking lamp, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #C25 | #C2:25 | Reserve | - | - | - |
| #C26 | #C2:26 | Rear window defroster, control signal | Ulow | Ubat /Ulow | - |
| #C27 | #C2:27 | Clutch pedal switch, internal, 75% | Ubat | Ulow / Ubat | - |
| #C28 | #C2:28 | Reserve | - | - | - |
| #C29 | #C2:29 | Accelerator pedal position sensor, input signal | - | - | - |
| #C30 | #C2:30 | Fuel level sensor, pump side, input signal | Ulow | U = 0.5-4 V | - |
| #C31 | #C2:31 | Communication LIN bus 2 | During communication the voltage is 0 V - Ubat | Heartbeat sensor (HBS). Mass movement sensor (MMS) (only XC60 with Panorama roof). |
|
| #C32 | #C2:32 | Reserve | - | - | - |
| #C33 | #C2:33 | Clutch pedal switch 25% | - | - | - |
| #C34 | #C2:34 | High level brake light, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #C35 | #C2:35 | Reserve | - | - | - |
| #C36 | #C2:36 | Rear left turn signal lamp, power supply | Ulow | Ubat -Ulow /Ulow | - |
| #C37 | #C2:37 | Reserve | - | - | - |
| #C38 | #C2:38 | Emergency brake light, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #C39 | #C2:39 | Rear fog lamp, power supply | Ulow | Ubat /Ulow | - |
| #C40 | #C2:40 | LIN bridge | The voltage is 0 V - Ubat during communication | - | |
| #C41 | #C2:41 | Reserve | - | - | - |
| #C42 | #C2:42 | Foldable head restraint | Ulow | Ubat /Ulow | - |
| #C43 | #C2:43 | Fuel level sensor, ejector side | Ulow | U=0.5-4 V | - |
| #C44 | #C2:44 | Reserve | - | - | - |
| #C45 | #C2:45 | 15-feed | Ulow | Ubat | - |
| #C46 | #C2:46 | Fuel level sensor, ejector side, ground | Ulow | Ulow | - |
| #C47 | #C2:47 | Accelerator pedal position sensor, ground | Ulow | Ulow | - |
| #C48 | #C2:48 | Fuel level sensor, ground | Ulow | Ulow | - |
| #C49 | #C2:49 | Reserve | - | - | - |
| #C50 | #C2:50 | Rear left parking lamp, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #C51 | #C2:51 | Reserve | - | - | - |
| #C52 | #C2:52 | License plate lighting, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #C53 | #C2:53 | Switch, lock, tailgate | - | - | - |
| #C54 | #C2:54 | Brake light switch, input signal | - | - | - |
| #C55 | #C2:55 | 15-power supply | Ubat | Ubat | Accelerator pedal position sensor |
| #C56 | #C2:56 | Power supply to interior lighting and driver's door control panel | Ubat /Ulow | Ubat | - |
| #C57 | #C2:57 | Heartbeat sensor (HBS), Mass movement sensor (MMS), power supply | Ubat | Ubat | Mass movement sensor (MMS) only for XC60 |
| #C58 | #C2:58 | BCM, accelerator pedal, 15-feed | Ulow | Ubat | - |
| #C59 | #C2:59 | Stop (brake) lamps | Ulow | Ubat /Ulow | - |
| #C60 | #C2:60 | Reserve | - | - | - |
| #D1 | #C2:61 | Reserve | - | - | - |
| #D2 | #C2:62 | Right reversing lamp, power supply | Ulow | Ubat /Ulow | - |
| #D3 | #C2:63 | Reserve | - | - | - |
| #D4 | #C2:64 | Power driver's seat and power passenger seat, power supply | Ubat /Ulow | Ubat /Ulow | - |
| #D5 | #C2:65 | Power ground | Ulow | Ulow | - |
| #D6 | #C2:66 | Brake light switch, power supply | Ulow | Ulow / Ubat | - |
| #D7 | #C2:67 | Tank hatch, unlocking | Ubat /Ulow | Ubat /Ulow | - |
| #D8 | #C2:68 | Reserve | - | - | - |
| #D9 | #C2:69 | Occupant weight sensor, power supply | - | - | - |
| #D10 | #C2:70 | Power supply relay, rear wiper motor | - | - | - |
| #D11 | #C2:71 | Trunk lid/tailgate, unlocking | Ubat /Ulow | Ubat /Ulow | Does not apply to the S80 |
| #D12 | #C2:72 | Trunk lid/tailgate, locking | Ubat /Ulow | Ubat /Ulow | Does not apply to the S80 |
| #D13 | #C2:73 | Left reversing lamp, power supply | Ulow | Ubat /Ulow | - |
| #D14 | #C2:74 | Rear wiper motor, control signal | - | - | - |
| #D15 | #C2:75 | Reserve | - | - | - |
| #D16 | #C2:76 | Fuel pump (FP), power supply | Ulow | Ubat /Ulow | - |
| Connector C3 (Blue) | |||||
|---|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Ignition off Active/Not active |
Ignition on Active/Not active |
Miscellaneous |
| #E1 | #C3:1 | Sun sensor, left, ground | Ulow | Ulow | - |
| #E2 | #C3:2 | Sun sensor left | Ulow | U = 0.25-4.75 V | - |
| #E3 | #C3:3 | Sun sensor 2 (right) | - | - | - |
| #E4 | #C3:4 | Reserve | - | - | - |
| #E5 | #C3:5 | Reserve | - | - | - |
| #E6 | #C3:6 | Reserve | - | - | - |
| #E7 | #C3:7 | Reserve | - | - | - |
| #E8 | #C3:8 | Hazard warning flasher switch | Ulow /Ubat | Ulow /Ubat | - |
| #E9 | #C3:9 | Reserve | - | - | - |
| #E10 | #C3:10 | Windshield wipers, Limp-home switch | Ubat /Ulow | Ubat /Ulow | - |
| #E11 | #C3:11 | Parking brake switch | Ubat | Ulow /Ubat | - |
| #E12 | #C3:12 | Reserve | - | - | - |
| #E13 | #C3:13 | Horn switch, input signal | Ulow / Ubat | Ulow / Ubat | - |
| #E14 | #C3:14 | Reserve | - | - | - |
| #E15 | #C3:15 | Reserve | - | - | - |
| #E16 | #C3:16 | Reserve | - | - | - |
| #E17 | #C3:17 | Reserve | - | - | - |
| #E18 | #C3:18 | Collision | Normal, f = 10 Hz, PWM = 50%. Impact registered, f = 250 Hz, PWM = 50%, for up to 5 seconds. |
- | |
| #E19 | #C3:19 | Courtesy lamp | Ubat /Ulow | Ubat /Ulow | - |
| #E20 | #C3:20 | Reserve | - | - | - |
| #E21 | #C3:21 | Reserve | - | - | - |
| #E22 | #C3:22 | Power parking brake switch illumination and ashtray lighting | Ulow | Ubat | - |
| #E23 | #C3:23 | Alarm diode, power supply | Alarm activated: 5 V 0.5Hz 5% duty Alarm triggered: 5 V 4Hz 25% duty |
- | |
| #E24 | #C3:24 | Reserve | - | - | - |
| #E25 | #C3:25 | Reserve | - | - | - |
| #E26 | #C3:26 | Reserve | - | - | - |
| #E27 | #C3:27 | Reserve | - | - | - |
| #E28 | #C3:28 | Reserve | - | - | - |
| #E29 | #C3:29 | Reserve | - | - | - |
| #E30 | #C3:30 | Reserve | - | - | - |
| #E31 | #C3:31 | Reserve | - | - | - |
| #E32 | #C3:32 | Switch, trunk lid/tailgate private locking | Ulow | Ubat /Ulow | - |
| #E33 | #C3:33 | Reserve | - | - | - |
| #E34 | #C3:34 | Reserve | - | - | - |
| #E35 | #C3:35 | Start button, input signal | - | - | - |
| #E36 | #C3:36 | Reserve | - | - | - |
| #E37 | #C3:37 | Courtesy lamp | Ubat /Ulow | Ubat /Ulow | - |
| #E38 | #C3:38 | Reserve | - | - | - |
| #E39 | #C3:39 | Positive temperature coefficient (PTC) heater, control signal | Ulow | Ubat -Ulow /Ulow | - |
| #E40 | #C3:40 | Reserve | - | - | - |
| #E41 | #C3:41 | Hazard warning flasher switch illumination | Ubat -U low if activated; Ulow otherwise | - | |
| #E42 | #C3:42 | Reserve | - | - | - |
| #E43 | #C3:43 | Reverse lockout, power supply | - | - | - |
| #E44 | #C3:44 | Twilight sensor | Ulow | U = 0.25-4.75 V | - |
| #E45 | #C3:45 | Reserve | - | - | - |
| #E46 | #C3:46 | Reserve | - | - | - |
| #E47 | #C3:47 | Communication CAN_H high speed network | During communication the voltage is 2.0-3.5 V | - | |
| #E48 | #C3:48 | Communication CAN_L high speed network | During communication the voltage is 1.5-2.5 V | - | |
| #E49 | #C3:49 | Communication LIN bus 3 | During communication the voltage is 0 V - Ubat | Steering column lock module (SCL) | |
| #E50 | #C3:50 | Communication LIN bus 3 | During communication the voltage is 0 V - Ubat | Start control module (SCU) | |
| #E51 | #C3:51 | Communication LIN bus 1 | During communication the voltage is 0 V - Ubat | Steering wheel module (SWM) | |
| #E52 | #C3:52 | Communication LIN bus 1 | During communication the voltage is 0 V - Ubat | Light switch module (LSM) | |
| #E53 | #C3:53 | Reserve | - | - | - |
| #E54 | #C3:54 | Reserve | - | - | - |
| #E55 | #C3:55 | Forward sensing module (FSM), power supply | Ulow | Ubat | - |
| #E56 | #C3:56 | Reserve | - | - | - |
| #E57 | #C3:57 | Reserve | - | - | - |
| #E58 | #C3:58 | Reserve | - | - | - |
| #E59 | #C3:59 | Reserve | - | - | - |
| #E60 | #C3:60 | Reserve | - | - | - |
| #F1 | #C3:61 | Reserve | - | - | - |
| #F2 | #C3:62 | Reserve | - | - | - |
| #F3 | #C3:63 | Reserve | - | - | - |
| #F4 | #C3:64 | 30-feed, infotainment control module (ICM) and integrated audio module (IAM) | Ubat | Ubat | - |
| #F5 | #C3:65 | Reserve | - | - | - |
| #F6 | #C3:66 | 15-feed, supplemental restraint system module (SRS) and OWS | Ulow | Ubat | - |
| #F7 | #C3:67 | Vanity mirror lighting, power supply | Ulow | Ubat /Ulow | Voltage supply alcolock (option) |
| #F8 | #C3:68 | 15-feed, PTC heater and heated rear seat switch | Ubat at ignition in position II; Ulow otherwise | - | |
| #F9 | #C3:69 | Driver information module (DIM), power supply | Ulow | Ubat | - |
| #F10 | #C3:70 | Steering wheel module (SWM), power supply | Ulow | Ubat | - |
| #F11 | #C3:71 | Steering column lock module (SCL), control signal from driver information module (DIM) | Ulow | Ubat /Ulow | Does not apply to the USA/CDN markets for 2009- |
| #F12 | #C3:72 | - | - | - | - |
| #F13 | #C3:73 | 30-feed, data link connector and climate control module (CCM) | Ubat | Ubat | - |
| #F14 | #C3:74 | Start control unit, (SCU), power supply | Ulow | Ubat | - |
| #F15 | #C3:75 | Roof hatch, voltage feed | Ubat | Ubat | - |
| #F16 | #C3:76 | Relay, steering column lock module (SCL), power supply | - | - | Does not apply to the USA/CDN markets for 2009- |
| Connector C4 (Black) | |||||
|---|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Ignition off Active/Not active |
Ignition on Active/Not active |
Miscellaneous |
| #B21 | #C4:1 | Parking brake switch illumination and ashtray lighting. | Ulow | Ubat | - |
| #B22 | #C4:2 | Seat belt reminder LED, power supply | Ulow | Ubat /Ulow | - |
| #B23 | #C4:3 | Speed roof hatch, control signal | Ulow | Ubat -Ulow /Ulow | - |
| #B24 | #C4:4 | LIN bridge | During communication the voltage is 0 V - Ubat | Vehicles with keyless system | |
| #B25 | #C4:5 | Communication LIN bus 0 | During communication the voltage is 0 V - Ubat | - | |
| #B26 | #C4:6 | High level brake light, power supply | Ulow | Ubat /Ulow | - |
| #B27 | #C4:7 | Communication LIN bus 2 | During communication the voltage is 0 V - Ubat | Movement sensor (IMS) | |
| #B28 | #C4:8 | Communication LIN bus 2 | During communication the voltage is 0 V - Ubat | Rain sensor module (RSM) | |
| #B29 | #C4:9 | Reserve | - | - | - |
| #B30 | #C4:10 | Reserve | - | - | - |
| #B31 | #C4:11 | Reserve | - | - | - |
| #B32 | #C4:12 | Emergency brake light, power supply | Ulow | Ubat /Ulow | - |
| #B33 | #C4:13 | Reserve | - | - | - |
| #B34 | #C4:14 | Sunroof, global closing | Ubat /Ulow | Ubat /Ulow | - |
| #B35 | #C4:15 | Movement sensor (IMS), Power supply | Ubat | Ubat | - |
| #B36 | #C4:16 | Remote receiver (RKE/RRX), voltage feed | Ubat | Ubat | Remote Receiver Module (RRX) for keyless system. Remote receiver Module (RRX) for non-keyless system. |
| #B37 | #C4:17 | Rain sensor module (RSM), power supply | Ulow | Ubat /Ulow | - |
| #B38 | #C4:18 | 15-feed, anti-dazzle rearview mirror | Ulow | Ubat | - |
| #B39 | #C4:19 | Reserve | - | - | - |
| #B40 | #C4:20 | Interior lighting, roof | Ubat /Ulow | Ubat /Ulow | - |