Control/Warning Messages, Function - GF54.30-P-2001RF
Model 205, 253
Function requirements in general
- Circuit 15R ON
The electronic ignition lock control unit (N73) transmits the status of circuit 15 via the user interface CAN (CAN HMI) to the instrument cluster (A1).
Control/warning messages, general
The instrument cluster control/warning messages notify the driver about the current state of the systems installed in the vehicle.
The instrument cluster can issue indicator and warning messages in the following ways:
- Optical issue of indicator and warning messages
- Acoustic output of indicator and warning messages
Visual control/warning messages:
The visual control/warning messages are output via the multifunction display (A1p13) or the indicator/warning lamps.
Audible control/warning messages:
The acoustic control/warning messages are output over the instrument cluster speaker (H4/61) in the driver footwell. The instrument cluster directly actuates the instrument cluster speaker.
Shown ECE variant (Economic Commission for Europe) except for code 464 (Digital instrument cluster full display)
Shown on model 253.99
Model 205, 253
with code 464 (Full display digital instrument cluster)
The symbols available on the analog display as indicator and warning lamps are shown accordingly on the digital full display.
The messages shown on the multifunction display are split up into four categories according to their level of urgency:
Category 1 (messages with highest priority):
Category 1 messages refer to states and situations which impair safety, and they take priority over messages with lower priority.
These messages are shown within a maximum period of t = 2 s after they occur, are automatically stored in the message memory and cannot be acknowledged. When they occur, a brief acoustic warning is emitted over the instrument cluster speaker.
Category 2 (messages with medium priority):
Category 2 messages require intervention from the driver and appear with a maximum time delay of t = 2 s. These messages also include operating feedback. Category 2 messages can be acknowledged. When they occur, a brief acoustic warning is emitted over the instrument cluster speaker.
Category 3 and 4 (messages with low priority):
These messages are shown in the menu and they are only for providing information to the driver (e.g. low washer fluid level). No warning chime is emitted.
Messages with low priority are overlaid by messages with high priority. If several messages with the same priority occur, the message currently displayed is cross-faded by the new message after expiry of the minimum display time.
Function sequence for control/warning messages
The instrument cluster informs the driver about the functionality and status of the installed vehicle systems. Safety-relevant system activities or system malfunctions are shown to the driver in the form of control and warning messages in the instrument cluster.
The following display options are provided for this purpose:
Visual:
- Indicator lamps (green, yellow or blue)
- Warning lamps (red)
- Multifunction display (text/graphic displays)
Acoustic:
- Instrument cluster speaker
The instrument cluster is connected to the vehicle electronics system via user interface CAN.
The electronic ignition lock control unit sends requests to output control and warning messages from control units that are connected to one of the following CANs via user interface CAN to the instrument cluster:
- Interior CAN (CAN B)
- Diagnostic CAN (CAN D)
- Periphery CAN (CAN PER)
- Suspension FlexRay (Flex E)
The drivetrain control unit (N127) sends requests to output control and warning messages from control units that are connected to one of the following CANs via the chassis FlexRay to the electronic ignition lock control unit:
- Engine CAN (CAN C)
- Drive train CAN (CAN C1)
- Hybrid CAN (CAN L)
- Fuel cell CAN (CAN FC)
Model 205.086/087/286/287/386/387/486/487:
Requests to issue control and warning messages from control units that are connected to the AMG CAN (CAN AMG), are sent by the AMG suspension control unit (N3/43) via the user interface CAN to the instrument cluster.
The systems and functions listed in the table below can request the output of control and warning messages via the corresponding control unit.
| System/Function | Control unit | Connection | Output | ||
|---|---|---|---|---|---|
| Indicator lamp | Display | Acoustic | |||
| Distance Pilot DISTRONIC (model 205 as of 01.06.2018, model 253 (except model 253.99) as of 01.06.2019 or model 253.99 with code 239 (Active Distance Assist DISTRONIC) or with code 23P (Driving Assistance Package)) | DISTRONIC distance pilot controller unit (A108/1) Mercedes-Benz Intelligent Drive control unit (N62/4) |
Flex E/CAN HMI | DISTRONIC warning lamp (A1e59) | - | x |
| ADAPTIVE BRAKE | Electronic Stability Program control unit (N30/4) |
Flex E/CAN HMI | Anti-lock braking system indicator lamp (A1e17), Electronic Stability Program warning lamp (A1e41), brake system warning lamp (A1e51) | x | - |
| Active Brake Assist (model 205 as of 01.06.2018, model 253 (except model 253.99) as of 01.06.2019 or model 253.99 with code 258 (Active Brake Assist)) | Active Brake Assist controller unit (A108) | CAN PER/CAN HMI | - | x | x |
| Active Brake Assist with cross-traffic function (model 205 as of 01.06.2018, model 253 (except model 253.99) as of 01.06.2019 or model 253.99 with code 23P (Driving Assistance Package)) | Mercedes-Benz Intelligent Drive control unit (N62/4) | Flex E/CAN HMI | - | - | x |
| Active Lane Keeping Assist (model 205 as of 01.06.2018, model 253 (except model 253.99) as of 01.06.2019 or model 253.99 with code 23P (Driving Assistance Package)) | Stereo multifunction camera (A40/13) | Flex E/CAN HMI | - | x | - |
| Active Lane Keeping Assist (model 205 as of 01.06.2018, model 253 (except model 253.99) as of 01.06.2019 or model 253.99 with code 22P (Lane Tracking Package)) | Mono multifunction camera (A40/11) | CAN PER/CAN HMI Flex E/CAN HMI | - | x | x |
| Active Lane Keeping Assist (model 205 up to 31.05.2018 or model 253 (except model 253.99) up to 31.05.2019 with code 238 (Active Lane Keeping Assist)) | Stereo multifunction camera (A40/13) Radar sensors control unit (N62/1) | Flex E/CAN HMI | - | x | x |
| Active Blind Spot Assist (model 205 as of 01.06.2018, model 253 (except model 253.99) as of 01.06.2019 or model 253.99 with code 23P (Driving Assistance Package)) | Mercedes-Benz Intelligent Drive control unit (N62/4) | Flex E/CAN HMI | - | x | x |
| Active Blind Spot Assist (model 205 up to 31.05.2018 or model 253 (except model 253.99) up to 31.05.2019 with code 23P (Driving Assistance Package)) | Radar sensors control unit (N62/1) | Flex E/CAN HMI | - | x | x |
| Trailer recognition (with CODE 550 (Trailer hitch)) | Trailer recognition control unit (N28/1) | CAN B/CAN HMI | - | x | - |
| Audio/Navigation/Communication | Head unit (A26/17) | HMI CAN | - | x | - |
| Attention assistance system | Electronic Stability Program control unit (N30/4) | Flex E/CAN HMI | - | x | x |
| Exterior lights | Front SAM control unit (N10/6) | CAN B/CAN HMI | High beams indicator lamp (A1e3), Rear fog light indicator lamp (A1e18), Standing lights indicator lamp (A1e38), Low beam indicator lamp (A1e67) |
x | x |
| Left headlamp control unit (E1n9) (with CODE 640 (High Performance LED) or CODE 641 (DYNAMIC LED HEADLAMP, LEFT-HAND TRAFFIC) or CODE 642 (DYNAMIC LED HEADLAMP, RIGHT-HAND TRAFFIC)) Right headlamp control unit (E2n9) (with CODE 640 (High Performance LED) or CODE 641 (DYNAMIC LED HEADLAMP, LEFT-HAND TRAFFIC) or CODE 642 (DYNAMIC LED HEADLAMP, RIGHT-HAND TRAFFIC)) |
CAN PER/CAN HMI | - | x | x | |
| Automatic transmission control (transmission 722, 724, 725) | Intelligent servo module for DIRECT SELECT (A80) and/or Fully integrated transmission control unit (Y3/8n4) | CAN C1/Flex E/CAN HMI | - | x | - |
| Turn signal confirmation | Front SAM control unit (N10/6) | CAN B/CAN HMI | Left turn signal lights indicator lamp (A1e1), Right turn signal indicator lamp (A1e2) |
- | x |
| BAS PLUS (model 205 up to 31.05.2018 or model 253 (except model 253.99) up to 31.05.2019 with code 23P (Driving Assistance Package)) | Radar sensors control unit (N62/1) Stereo multifunction camera (A40/13) |
Flex E/CAN HMI | - | x | - |
| Brake fluid level | Front SAM control unit (N10/6) | CAN B/CAN HMI | Brake fluid and parking brake indicator lamp (A1e6) | x | - |
| Brakepad wear display | Front SAM control unit (N10/6) | CAN B/CAN HMI | - | x | - |
| Fuel cell (model 253.99) | Battery management system control unit (N82/2) Fuel cell control unit (N116/2) Fuel cell management system control unit (N116/5) Hydrogen tank control unit (N3/19) Power electronics control unit (N129/1) |
CAN L/Flex E/CAN HMI CAN FC/Flex E/CAN HMI CAN C1/Flex E/CAN HMI |
Start-off protection warning message, Towing ban warning message, Sound generator warning message, High-voltage system error warning message, Hydrogen system error warning message, Limited propulsion power warning message |
x | - |
| COLLISION PREVENTION ASSIST (model 205 up to 31.05.2018 or model 253 (except model 253.99) up to 31.05.2019 with code 258 (COLLISION PREVENTION ASSIST)) | COLLISION PREVENTION ASSIST controller unit (A90) | CAN PER/CAN HMI | DISTRONIC warning lamp (A1e59) | x | - |
| Damping system (model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRMATIC), model 253 with CODE 489 (AIR BODY CONTROL)) | AIRMATIC control unit (N51/3) (model 205) AIR BODY CONTROL control unit (N51/3) (model 253) |
Flex E/CAN HMI | - | x | - |
| DISTRONIC PLUS (model 205 up to 31.05.2018 or model 253 (except model 253.99) up to 31.05.2019 with code 239 (Active Distance Assist DISTRONIC)) | DISTRONIC electric controller unit (A89) | Flex E/CAN HMI | DISTRONIC warning lamp (A1e59) | x | - |
| DISTRONIC PLUS with Steering Assist (model 205 up to 31.05.2018 or model 253 (except model 253.99) up to 31.05.2019 with code 23P (Driving Assistance Package)) | Radar sensors control unit (N62/1) | Flex E/CAN HMI | DISTRONIC warning lamp (A1e59) | - | x |
| Parking system (with code 235 (Parking Pilot with PARKTRONIC)) | Parking system control unit (N62) | Flex E/CAN HMI | - | x | x |
| Electrical power steering | Electrical power steering control unit (N68) | Flex E/CAN HMI | - | x | - |
| Electronic differential (model 205.086/087/286/287/386/387/486/487) | Electronic differential control unit (N3/2) | CAN AMG/CAN HMI | - | x | - |
| Electronic Stability Program (ESP®) | Electronic Stability Program control unit (N30/4) | Flex E/CAN HMI | ESP®/ASR OFF warning lamp (A1e32) (status ESP® ON/OFF) Electronic Stability Program warning lamp (A1e41) (ESP® system active) |
x | - |
| Parking brake warning | Electronic Stability Program control unit (N30/4) | Flex E/CAN HMI | Parking brake indicator lamp (A1e10), Parking brake warning lamp (A1e11) |
x | - |
| Windshield washer system fluid level | Front SAM control unit (N10/6) | CAN B/CAN HMI | - | x | - |
| Transmission oil warning (transmission 722) | Transmission oil auxiliary pump control unit (N89) | CAN C1/Flex E/CAN HMI | - | x | x |
| Seat belt reminder warning | Supplemental Restraint System control unit (N2/10) | HMI CAN | Seat belt warning lamp (A1e9) | - | x |
| Rear SAM control unit (N10/8) | CAN B/CAN HMI | - | x | x | |
| HYBRID high-voltage on-board electrical system (hybrid vehicles) | Power electronics control unit (N129/1) Battery management system control unit (N82/2) | CAN L/Flex E/CAN HMI | Regenerative braking system indicator lamp (A1e20) | x | - |
| KEYLESS-GO (with CODE 889 (KEYLESS-GO) or CODE 893 (KEYLESS-GO start function)) | KEYLESS-GO control unit (N69/5) | CAN B/CAN HMI | - | x | x |
| Climate control | Climate control control unit (N22/1) | CAN B/CAN HMI | - | x | x |
| Fuel pump warning | Fuel system control unit (N118) | CAN C1/Flex E/CAN HMI | - | x | - |
| Coolant level | Front SAM control unit (N10/6) | CAN B/CAN HMI | - | x | - |
| Coolant temperature | CDI control unit (N3/9) or ME-SFI control unit (N3/10) | CAN C/Flex E/CAN HMI | Coolant temperature warning lamp (A1e54) | x | - |
| Power steering | Electronic Stability Program control unit (N30/4) | Flex E/CAN HMI | Power steering warning lamp (A1e70) | x | - |
| Lights on warning | Front SAM control unit (N10/6) | CAN B/CAN HMI | - | x | x |
| Memory adjustment (with CODE 275 (Memory package) or CODE 242 (Electrically adjustable front passenger seat with memory function)) | Driver seat control unit (N32/1) or Front passenger seat control unit (N32/2) |
CAN B/CAN HMI | - | x | |
| Engine diagnosis | CDI control unit (N3/9) or ME-SFI control unit (N3/10) | CAN C/Flex E/CAN HMI | Engine diagnosis indicator lamp (A1e58) | x | - |
| Engine oil level warning | CDI control unit (N3/9) or ME-SFI control unit (N3/10) | CAN C/Flex E/CAN HMI | - | x | - |
| Emergency call system (with CODE 348 (Emergency call/assist system)) | Emergency call system control unit (N123/4) | CAN D/CAN HMI | - | x | - |
| Emergency call system (with code 350 (eCall Europe emergency call system)) | Telematics services communications module (N112/1) | CAN D/CAN HMI | - | x | - |
| Emergency call system (with code 360 (HERMES UMTS) or with code 362 (HERMES LTE)) | HERMES control unit (N112/9) | CAN D/CAN HMI | x | - | |
| PRE-SAFE® (with code 299 (PRE-SAFE® system)) | Left front reversible emergency tensioning retractor motor (A76) or Right front reversible emergency tensioning retractor (A76/1) | HMI CAN | Supplemental restraint system indicator lamp (A1e15) | x | - |
| PRE-SAFE® brake (with CODE 23P (Driving assistance package)) | Radar sensors control unit (N62/1) Stereo multifunction camera (A40/13) | Flex E/CAN HMI | - | x | - |
| RACE START (model 205.086/087/286/287/386/387/486/487) | Electronic Stability Program control unit (N30/4) | Flex E/CAN HMI | ESP SPORT indicator lamp (A1e46) | x | - |
| Tire pressure monitor (with code 475 (Tire pressure monitor)) | Tire pressure monitor control unit (N88) | HMI CAN | Tire pressure monitor warning lamp (A1e66) | x | - |
| Tire pressure loss warning (with code 477 (Tire pressure loss warning)) | Electronic Stability Program control unit (N30/4) | Flex E/CAN HMI | - | x | - |
| Lane Keeping Assist (model 205 up to 31.05.2018 or model 253 (except model 253.99) up to 31.05.2019 with code 476 (Lane Keeping Assist)) | Mono multifunction camera (A40/11) | CAN PER/CAN HMI | - | x | - |
| Stationary heater (with CODE 228 (Stationary heater)) | Stationary heater control unit (A6n1) | LIN B8-2/CAN B/CAN HMI | - | x | - |
| Supplemental restraint system | Supplemental Restraint System control unit (N2/10) | HMI CAN | Supplemental restraint system indicator lamp (A1e15) | x | - |
| Fuel cap warning (with code 494 (USA version)) | CDI control unit (N3/9) or ME-SFI control unit (N3/10) | CAN C/Flex E/CAN HMI | Fuel reserve warning light (A1e4) | x | - |
| Cruise control | Electronic Stability Program control unit (N30/4) | Flex E/CAN HMI | Speedometer (A1p8) | x | x |
| Blind Spot Assist (with CODE 22P (Lane package)) | Integrated outer right rear bumper radar sensor (B92/6) Integrated outer left rear bumper radar sensor (B92/11) |
CAN PER/CAN HMI | - | x | x |
| Doors OPEN warning | Front SAM control unit (N10/6) Rear SAM control unit (N10/8) Left front door control unit (N69/1) Right front door control unit (N69/2) Left rear door control unit (N69/3) (model 205.0/1/2, 253) Right rear door control unit (N69/4) (model 205.0/1/2, 253) |
CAN B/CAN HMI | - | x | x |
| Soft top warning (model 205.4) | Rear control unit (N22/6) | CAN B/CAN HMI | - | x | - |
| Traffic Sign Assist (with CODE 513 (Traffic Sign Assist)) | Mono multifunction camera (A40/11) (with CODE 22P (Lane package)) Stereo multifunction camera (A40/13) (with CODE 23P (Driving assistance package)) | CAN PER/CAN HMI Flex E/CAN HMI | - | x | - |
| Preglow indicator (diesel engine) | CDI control unit (N3/9) | CAN C/Flex E/CAN HMI | Preglow indicator lamp (A1e16) | - | - |
Special case of country-dependent seat belt reminder warning:
If, immediately prior to starting a journey or during a journey, a seat belt is detected to be not fitted, the instrument cluster issues a country-specific optical and acoustic seat belt reminder warning.
The Supplemental Restraint System control unit (N2/10) sends information on the status of the driver and front passenger seat belts to the instrument cluster via user interface CAN.
The rear SAM control unit (N10/8) transmits information on the status of the rear seat belts via interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster.
The instrument cluster evaluates this information for issuing a country-specific seat belt reminder warning.
The seat belt reminder message for the front passenger is only issued, if the front passenger seat is recognized as occupied. The Supplemental Restraint System control unit sends information on the assignment of front passenger seat to the instrument cluster via user interface CAN.
The rear passenger compartment seat belt warning is always issued as from v = 6 km/h. After t = 5 s or acknowledgment, the seat belt warning is cleared. The output of the rear seat belt warning does not have any effect on the deployment of the restraint equipment; it only serves as information for the driver.
If a seat belt is not fastened, the supplemental restraint systems control unit sends a corresponding signal via user interface CAN to the instrument cluster.
The manner of how the seat belt reminder warning is issued differs in whether the seat belt reminder warning is prescribed by law or not and is incorporated into the assessment through the New Car Assessment Program (NCAP).
NCAP is an assessment program for safety in new vehicles. Countries with legally prescribed seat belt reminder:
- Extended NCAP:
USA, Canada
Countries without seat belt reminder warning prescribed by law:
- European New Car Assessment Program:
Europe, China, Australia, Japan, Korea and Arab States of the Gulf
In countries in which the seat belt warning is prescribed by law (extended NCAP), the seat belt warning lamp is actuated for a time interval of t = 6 + 2 s. It is irrelevant here whether the driver seat belt is fitted or not. If the driver's seat belt is not fastened, the instrument cluster also outputs an acoustic warning over the instrument cluster speaker.
If the driver seat belt is fastened during this time interval, the acoustic warning is switched off.
An assessment of whether the front passenger seat belt is fitted or not given during this time interval. Both seat belts are only assessed after the time interval of t = 6 s has expired. In countries in which the seat belt warning is not prescribed by law, the seat belt warning lamp is only actuated during the indicator lamp test.
As soon as engine start is detected ("Engine running" signal or "Drive train ready" set), information on the status of seat belts for driver and front passenger is evaluated. If a seat belt is defined to not be fitted, the instrument cluster actuates the seat belt warning lamp. If the vehicle starts to move, several warning tone phases are issued once it reaches a speed of v > 25 km/h.
Three or four acoustic warnings are issued in accordance with the seat belt reminder warning. While these warning tone phases are being issued, the seat belt warning lamp flashes at a frequency of f = 2 Hz. After all the acoustic warning phases have expired the seat belt warning lamp is permanently actuated.
Acoustic warning phase 1:
If the vehicle drives off, acoustic warning phase 1 starts to run in the background. When a speed of v > 25 km/h is reached, a quiet warning tone sounds at an interval of t = 4 s. Warning tone phase 1 lasts for a max of t = 20 s. The transition into warning phase 2 follows.
Acoustic warning phase 2:
After warning tone phase 1 has elapsed and from a speed of v ≥ 25 km/h, a quiet warning tone sounds for a maximum of t = 20 s at an interval of t = 2 s. The transition into warning phase 3 follows.
Acoustic warning phase 3:
After warning tone phase 2 has elapsed and from a speed of v ≥ 25 km/h a quiet warning tone sounds for a maximum of t = 20 s at an interval of t = 1 s. The transition to warning phase 4 then takes place.
Acoustic warning phase 4 (Euro NCAP only):
After warning tone phase 3 has elapsed and from a speed of v ≥ 25 km/h, a loud warning tone sounds for a maximum of t = 93 s at an interval of t = 0.5 s.
Cancellation of seat belt reminder warning:
- The last acoustic warning phase is fully completed.
- The seat belt was fitted during the active seat belt reminder warning.
- When the vehicle is stationary the vehicle door on the actuating side is opened.
Seat belt reminder warning reactivation:
- Seat belt release has been detected again.
- If the vehicle is at a standstill and the driver or front passenger door is opened and then closed again.
- A new ignition cycle is detected from the time the "Engine running" or "Drive train operational" signal is set.
| Electrical function schematic of instrument cluster, control/warning message | PE54.30-P-2054-97FBA | ||
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996RF |