Abbreviations Of Signal And Circuit Designations For Wiring Diagrams - OV00.01-P-1001-28FCA
WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.
Model 253 (except 253.99)
as of model year 2020
Model 253.99
as of model year 2019
with code 9O1 (Fuel cell pre-installation)
| Abbreviation | Designation | Notes |
|---|---|---|
| (+) | Voltage supply, positive | |
| (-) | Low potential | |
| 15 | Terminal 15 | Positive switched battery voltage (switched via relay) |
| 15R | Circuit 15 radio position | Positive switched battery voltage (radio position) |
| 15M | Circuit 15 engine compartment | Positive switched battery voltage - engine compartment |
| 30 | Circuit 30 | Positive battery voltage (continuous positive), 12 V onboard electrical system |
| 30b | Circuit 30b | Positive battery voltage (ECO start/stop function additional battery), 12 V on-board electrical system |
| 30c | Circuit 30c | Positive battery voltage (via pyrofuse F63 to 48 V on-board electrical system) |
| 30L | Circuit 30L | Headlamp illumination signal |
| 30t | Circuit 30t | Circuit 30 after battery disconnect switch |
| 30t_LIGHT_L | Circuit 30t for illumination on left | Circuit 30 after battery disconnect switch for illumination on left |
| 30t_LIGHT_R | Circuit 30t for illumination on right | Circuit 30 after battery disconnect switch for illumination on right |
| 30t_CHARGE | Circuit 30t for charge line | Circuit 30 after battery disconnect switch for charge line |
| 30t_MOT | Circuit 30t for swivel motor | Circuit 30 after battery disconnect switch for swivel motor |
| 31 | Circuit 31 | Return line to battery negative or ground connection (direct), 12 V onboard electrical system |
| 40 | Circuit 40 | Positive battery voltage (continuous positive), 48 V onboard electrical system |
| 41 | Circuit 41 | Return line to battery negative or ground connection (direct), 48 V onboard electrical system |
| 50 | Signal 'Engine start' | |
| 54 | Brake signal | |
| 58d | Terminal 58d | Actuation of dimmable interior lighting |
| 87 | Terminal 87 | Positive battery voltage (switched) |
| 87C | Circuit 87 chassis | Positive battery voltage (switched) - chassis |
| 87M | Circuit 87 engine compartment | Positive battery voltage (switched) - engine compartment |
| AB_1_(+) | Actuation, driver airbag stage 1 | |
| AB_1_GND | Ground connection, driver airbag stage 1 | |
| AB_2_(+) | Actuation, driver airbag stage 2 | |
| AB_2_GND | Ground connection, driver airbag stage 2 | |
| AM | AM antenna signal | |
| AM_FM_DABIII | AM, FM and digital antenna signal | |
| AUDIO_C1_H | Audio signal, dual coil speaker, coil 1, high | |
| AUDIO_C1_L | Audio signal, dual coil speaker, coil 1, low | |
| AUDIO_C2_H | Audio signal, dual coil speaker, coil 2, high | |
| AUDIO_C2_L | Audio signal, dual coil speaker, coil 2, low | |
| AUDIO_H | Audio signal, High | |
| AUDIO_L | Audio signal, Low | |
| BL_(+) | Brake light | Actuation of brake light |
| BL/TL/TSI_(+) | Brake light, tail light and turn signal indicator, combined | Actuation of combined brake light, tail light and turn signal indicator |
| BL/TSI_(+) | Brake light and turn signal indicator, combined | Actuation of combined brake light and turn signal indicator |
| BSM_(+) | Blind Spot Assist, power supply | |
| BSM_GND | Blind Spot Assist, ground connection | |
| BT | Bluetooth® | |
| BT_W-LAN | Bluetooth® and WLAN | |
| BUL_(+) | Backup lamp | Reversing lamp actuation |
| CAN-A_H | Telematics CAN HIGH | |
| CAN-A_L | Telematics CAN low | |
| CAN-AMG_H | AMG CAN, high | |
| CAN-AMG_L | AMG CAN, low | |
| CAN-B_H | Interior CAN HIGH | |
| CAN-B_L | Interior CAN LOW | |
| CAN-C_H | Engine CAN High | |
| CAN-C_L | Engine CAN Low | |
| CAN-C1_H | Drive train CAN High | |
| CAN-C1_L | Drive train CAN Low | |
| CAN-D_H | Diagnostic CAN High | |
| CAN-D_L | Diagnostic CAN Low | |
| CAN-DRVU_H | Drive unit CAN High | |
| CAN-DRVU_L | Drive unit CAN Low | |
| CAN-EL_H | Electric drive CAN High | |
| CAN-EL_L | Electric drive CAN Low | |
| CAN-FC_H | Fuel cells CAN High | |
| CAN-FC_L | Fuel cells CAN Low | |
| CAN-HAL_H | Rear axle steering CAN High | |
| CAN-HAL_L | Rear axle steering CAN Low | |
| CAN-H_H | Vehicle dynamics CAN High | |
| CAN-H_L | Vehicle dynamics CAN Low | |
| CAN-HMI_H | User interface CAN High | |
| CAN-HMI_L | User interface CAN Low | |
| CAN-I_H | Drive train sensor CAN High | |
| CAN-I_L | Drive train sensor CAN Low | |
| CAN-K_H | Multifunction CAN High | |
| CAN-K_L | Multifunction CAN Low | |
| CAN-L_H | Hybrid CAN High | |
| CAN-L_ L | Hybrid CAN Low | |
| CAN-LR_H | Steering wheel CAN High | |
| CAN-LR_L | Steering wheel CAN Low | |
| CAN-PER_H | Periphery CAN High | |
| CAN-PER_L | Periphery CAN Low | |
| CAN-S1_H | Radar CAN 1 high | |
| CAN-S1_L | Radar CAN 1 low | |
| CAN-S2_H | Radar CAN 2 high | |
| CAN-S2_L | Radar CAN 2 low | |
| CAS | Actuation of antenna splitter | Antenna switch control |
| CC1 | CC1 (connection confirmation 1) signal | |
| CC2 | CC2 (connection confirmation 2) signal | |
| CLUTCH_(+) | Actuation of magnetic clutch | |
| COM+ | Communication + signal | |
| COM- | Communication - signal | |
| CC | CC signal | |
| CP | CP signal (control pilot) | |
| CS | CS signal (control signal) | |
| CRASH | Crash signal | Digital Audio Broadcasting (VHF band III) |
| DABIII | Digital radio | |
| DCS | Door lock rotary tumbler signal | |
| DCS_(+) | Door lock rotary tumbler signal via transmit current | |
| DCS_GND | Door lock rotary tumbler signal, ground connection | |
| DIAG | Diagnosis | |
| DOWN | Signal down | |
| DSRC | Signal, digital vehicle communication | Dedicated Short Range Communication, valid for Japan |
| DTRL_(+) | Actuation of daytime running lights | BR177 |
| EC_(+) | Electric mirror dimming, power supply | |
| EC_GND | Electric mirror dimming, ground connection | |
| ELV | Electric steering lock | |
| ELV_Data | Electric steering lock, data exchange | |
| ETH_(+) | Network connection Diagnosis, positive | Network connection (Ethernet) Diagnosis, positive |
| ETH_(-) | Network connection Diagnosis, negative | Network connection (Ethernet) Diagnosis, negative |
| FL_1 | Fuel quantity sensor, signal 1 | |
| FL_2 | Fuel quantity sensor, signal 2 | |
| FL_GND | Fuel quantity sensor, ground connection | |
| FLEX-E_BM | Chassis FlexRay bus, negative | |
| FLEX-E_BP | Chassis FlexRay bus, positive | |
| F_LIGHT_GND | Function lighting, ground connection | |
| FLOW | Flow signal, ground current | |
| FM | FM antenna signal | |
| FM_DABIII | FM and digital antenna signal | |
| FM_AM | FM, AM antenna signal | |
| FOLD_IN/OUT | Signal for folding in/out electric outside mirrors | In = +; out = GND |
| FOLD_OUT/IN | Signal for folding out/in electric outside mirrors | Out = +; in = GND |
| GND | Ground connection | Return line to battery negative or ground connection (indirect) |
| GND_V | Virtual ground connection | |
| GPS | GPS signal | Signal for global positioning system |
| HAZARD_SIG | Signal for actuating hazard warning lights | |
| HAZARD_LIGHT | Power supply, hazard warning flasher switch illumination | |
| HB_(+) | High beam actuation | BR 177 |
| HEAT_(+) | Heating element power supply | |
| HEAT_ GND | Heating element ground connection | |
| HF | High frequency radio signal | |
| HIGH | High-side actuation/signal | |
| HSVL | High-speed video link | |
| HV_(+) | High-voltage power supply, positive | |
| HV_(-) | High-voltage power supply, negative | |
| ILK | Interlock | |
| IL_(+) | Interior lamp, power supply | |
| I_PUMP | Pump current | Oxygen sensor, pump current |
| KAPA | KEYLESS-GO, sensor signal | |
| LB_(+) | Actuation of Low beam | BR177 |
| LED_(+) | Signal, LED status display | |
| LED_(+)_G | Signal, green LED status display | |
| LED_(+)_R | Signal, red LED status display | |
| LED_(+)_W | Signal, white LED status display | |
| LED_(-) | Signal, LED status display | |
| LEV_(+) | Headlamp range adjustment | BR177 |
| LF_1 | KEYLESS-GO antenna signal 1 | |
| LF_2 | KEYLESS-GO antenna signal 2 | |
| LF_MID | KEYLESS-GO antenna signal, center | |
| ILLU_(+) | Illumination actuation | |
| ILLU_GND | Illumination, ground connection | |
| LIN_1 | Local Interconnect Network | |
| LIN_2 | Local Interconnect Network | |
| LIN_3 | Local Interconnect Network | |
| LIN_4 | Local Interconnect Network | |
| LIN_5 | Local Interconnect Network | |
| LIN_6 | Local Interconnect Network | |
| LIN_7 | Local Interconnect Network | |
| LIN_8 | Local Interconnect Network | |
| LOW | Low-side actuation/signal | |
| LVDS_H | Signal line, LVDS high | Low voltage differential signaling, high signal level |
| LVDS_L | Signal line, LVDS low | Low voltage differential signaling, low signal level |
| L1 | Coil 1 | |
| L2 | Coil 2 | |
| L_(+) | Power supply coil | |
| L1_(+) | Coil 1, power supply | |
| L2_(+) | Coil 2, power supply | |
| L_GND | Switched ground connection coil | |
| L1_GND | Switched ground connection, coil 1 | |
| L2_GND | Switched ground connection, coil 2 | |
| LOCK_UNLOCK | Signal for closing/opening additional door lock | |
| MIC_H | Audio signal, microphone, High | |
| MIC_L | Audio signal, microphone, low | |
| MOST | Media Oriented System Transport | |
| MOST_IN | Media Oriented System Transport, input | |
| MOST_OUT | Media Oriented System Transport, output | |
| MOT | Motor actuation | |
| MOT_(+) | Motor actuation, positive | |
| MOT_(+)/GND | Engine plus/minus actuation | +/- depending on direction of rotation |
| MOT_GND | Motor actuation, negative | |
| MOT_GND/(+) | Engine minus/plus actuation | -/+ depending on direction of rotation |
| MOT_LR_(+)/GND | Mirror adjustment, motor actuation, positive/negative (right/left) | |
| MOT_LR_GND/(+) | Mirror adjustment, motor actuation, negative/positive (right/left) | |
| MOT_UD_(+)/GND | Mirror adjustment, motor actuation, positive/negative (high/low) | |
| MOT_UD_GND/(+) | Mirror adjustment, motor actuation, negative/positive (high/low) | |
| MPAC_U | Multiphase alternating current, phase U | |
| MPAC_V | Multiphase alternating current, phase V | |
| MPAC_W | Multiphase alternating current, phase W | |
| MPAC_X | Multiphase alternating current, phase X | |
| MPAC_Y | Multiphase alternating current, phase Y | |
| MPAC_Z | Multiphase alternating current, phase Z | |
| MUTE | Mute function | |
| N | Neutral conductor | |
| NC | Not connected | |
| PE | PE protective ground conductor (protective earth) | |
| PL_(+) | Parking light | Actuation of parking lights |
| P-NOT | Park pawl | Emergency power supply for park pawl transmission |
| POS_(+) | Hall sensor power supply | |
| POS_GND | Hall sensor ground connection | |
| POS_HRES | High-resolution position signal | Position signal, high resolution |
| POS | Position signal sensor | Position signal via Hall sensor |
| POS_1 | Sensor 1 position signal | |
| POS_2 | Sensor 2 position signal | |
| POS_3 | Sensor 3 position signal | |
| POT | Equipotential bonding | |
| PP | PP signal (proximity) | |
| PP/CS | PP signal (proximity)/CS signal (control signal) | |
| PUMP | Pump actuation | |
| PUMP_GND | Pump actuation via ground connection | |
| PUMP_(+) | Pump power supply | |
| PRE | Pressure signal | |
| REF | Measurement reference signal | |
| REL_(+) | Relay actuation, positive | |
| REL_GND | Actuation of relay ground connection | |
| REL_C_(+) | Actuation of relay NO contact, positive | |
| REL_C_GND | Actuation of relay NO contact, ground connection | |
| REL_O_(+) | Actuation of relay NC contact, positive | |
| REL_O_GND | Actuation of relay NC contact, ground connection | |
| RFL_(+) | Rear fog lamp | Rear fog lamp actuation |
| RL_(+) | Reading lamp, power supply | |
| S+ | Charging communication CAN-H signal | |
| S- | Charging communication CAN-L signal | |
| SDARS | Satellite radio signal | Satellite Digital Audio Radio Services signal (North America) |
| SENS | Sensor signal | |
| SENS_1 | Sensor signal for sensor 1 | |
| SENS_2 | Sensor signal for sensor 2 | |
| SENS_(+) | Sensor power supply | |
| SENS_1_(+) | Sensor 1 power supply | |
| SENS_2_(+) | Sensor 2, power supply | |
| SENS_GND | Sensor ground connection | |
| SENS_1_GND | Sensor 1, ground connection | |
| SENS_2_GND | Sensor 2, ground connection | |
| SENT | Digital signal line SENT | Single Edge Nibble Transmission signal line |
| SENT_(+) | Digital signal line SENT, positive | Single Edge Nibble Transmission signal line, positive |
| SENT_GND | Digital signal line SENT, ground connection | Single Edge Nibble Transmission signal line, ground connection |
| SHD | Shielding | |
| SIG | Signal | |
| SIG_1 | Signal 1 | |
| SIG_2 | Signal 2 | |
| SIG_3 | Signal 3 | |
| SIG_4 | Signal 4 | |
| SIG_15 | Terminal 15 signal | Signal for positive switched battery voltage (switched via relay) |
| SIG_31 | Ground signal, control unit coding | |
| SIG_C | Signal center | |
| SIG_L | Signal left | |
| SIG_R | Signal right | |
| SIG_(+) | Signal via transmit current | |
| SIG_(+)/GND | Alternating signal via transmit current/ground connection | |
| SIG_1_(+) | Signal 1 via transmit current | |
| SIG_2_(+) | Signal 2 via transmit current | |
| SIG_GND | Signal via ground connection | Signal via switched ground connection |
| SIG_L1_(+) | Actuation of coil 1, positive | |
| SIG_L1_GND | Actuation of coil 1 via ground connection | |
| SIG_L2_(+) | Actuation of coil 2, positive | |
| SIG_L2_GND | Actuation of coil 2 via ground connection | |
| SIG_RL | Reading lamp signal | |
| S_ILLU_GND | Switch and controls illumination, ground connection | |
| SML_(+) | Actuation of side-marker lamp | BR177 |
| START | Actuation of starter relay | |
| TEL | Signal, telephone | |
| TEMP | Temperature signal | |
| TEMP_GND | Ground connection, temperature sensor | |
| TEMP_L | Signal for temperature sensor left | |
| TEMP_R | Signal for temperature sensor right | |
| TEMP_1 | Temperature signal, sensor 1 | |
| TEMP_2 | Temperature signal, sensor 2 | |
| TL_(+) | Taillamp | Tail light actuation |
| TL_L_(+) | Left taillamp | Tail light actuation, left |
| TL_R_(+) | Right taillamp | Tail light actuation, right |
| TL/BL_(+) | Brake light and tail light, combined | |
| TL/PL_(+) | Tail light and parking lights, combined | Actuation of combined tail light and parking lights |
| TL/PL/SML_(+) | Tail light, parking lights, and side marker light, combined | Actuation of combined tail light, parking lights, and side marker light |
| TL/PL/BL/TSI_(+) | Tail light, parking light, brake light and turn signal indicator, combined | Actuation of combined tail light, parking lights, brake light and turn signal indicator |
| TRM | Scheduling | |
| TSI_(+) | Direction indicator lamp | Actuation of turn signal indicator |
| TSI_GND | Negative activation of turn signal indicator | |
| TSI_L_(+) | Left turn signal | Actuation of turn signal indicator left |
| TSI_R_(+) | Right turn signal | Actuation of turn signal indicator right |
| TV1 | Antenna signalTV1 | |
| TV2 | Antenna signalTV2 | |
| TV3 | Antenna signalTV3 | |
| UNLOCK_LOCK | Signal for opening/closing additional door lock | |
| UP | Signal up | |
| USB_(+) | USB interface, power supply | |
| USB_DATA_H | USB interface, data exchange, High | |
| USB_DATA_L | USB interface, data exchange, low | |
| USB_GND | USB interface, ground connection | |
| USB_H | Signal for USB interface, High | |
| USB_L | Signal for USB interface, Low | |
| USB_RUI_H | USB interface control, High | |
| USB_RUI_L | USB interface control, Low | |
| VALVE_GND | Valve actuation via ground connection | |
| VALVE_(+) | Valve actuation | |
| VALVE_H | High-side valve actuation | |
| VALVE_L | Low-side valve actuation | |
| VALVE_1_H | Actuation of high-side valve 1 | |
| VALVE_1_L | Actuation of low-side valve 1 | |
| VALVE_2_H | Actuation of high-side valve 2 | |
| VALVE_2_L | Actuation of low-side valve 2 | |
| VICS | Signal for vehicle information and communication | Vehicle Information and Communication System, valid for Japan |
| VIDEO | Digital video signal | |
| W-LAN | WLAN signal | |
| WAKE_UP | Wake-up signal | |
| WSR | Warm start request |