Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control/Warning Messages, Function - GF54.30-P-2001RR
Model 190
Function requirements in general
- Terminal 15R On:
The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 via the suspension CAN 1 (CAN E1), the AMG Gateway control unit (N93/9) and 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 indicator/warning messages are emitted over the instrument cluster speaker (H4/61) in the driver footwell, that is directly actuated by the instrument cluster.
Shown on model 190 up to 30.11.2018, ECE variant (Economic Commission for Europe)
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, then automatically stored in the message memory and they 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 the intervention of the driver and appear with a time delay of a maximum 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 crossfaded 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 AMG Gateway control unit transmits requests for outputting control and warning messages from control units that are connected with the AMG FlexRay (Flex AMG) (as of 01.12.2018) or with one of the following CANs to the instrument cluster via the user interface CAN:
- Interior CAN
- Chassis CAN 1 (CAN E1)
- Chassis CAN 2 (CAN E2)
- Drive train CAN (CAN C1)
Requests for outputting control and warning messages from control units that are connected with the diagnostics CAN are sent via the front SAM control unit with fuse and relay module (N10/1) and the interior CAN to the AMG Gateway control unit.
Requests to issue control and warning messages from control units that are connected to the engine CAN (CAN C), are sent by the powertrain control unit (N127) via chassis CAN 1 to the AMG gateway control unit.
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 | |||
| ADAPTIVE BRAKE | Electronic Stability Program control unit (N30/4) | CAN E1/CAN HMI | Antilock braking system indicator lamp (A1e17), Electronic Stability Program warning lamp (A1e41), Brake system warning lamp (A1e51) |
x | - |
| Audio/Navigation/Communication | Head unit (A26/17) | HMI CAN | - | x | - |
| Attention assistance system | Electronic Stability Program control unit (N30/4) | CAN E1/CAN HMI | - | x | x |
| Exterior lights (ABL) | Front SAM control unit with fuse and relay module (N10/1) | CAN B/CAN HMI | High beams indicator lamp (A1e3), Rear fog light indicator lamp (A1e18) (except CODE 460 (Canada version) and except CODE 494 (USA version)), Standing lights indicator lamp (A1e38), Low beam indicator lamp (A1e67) |
x | x |
| Left headlamp control unit (E1n9), Right headlamp control unit (E2n9) |
CAN E2/CAN HMI | - | x | - | |
| Automatic transmission control | Dual-clutch transmission control unit (N15/13) | CAN C1/CAN HMI | - | x | - |
| Turn signal confirmation | Front SAM control unit with fuse and relay module (N10/1) | CAN B/CAN HMI | Left turn signal lights indicator lamp (A1e1), Right turn signal indicator lamp (A1e2) |
- | x |
| Brake fluid level | Front SAM control unit with fuse and relay module (N10/1) | CAN B/CAN HMI | Brake fluid and parking brake indicator lamp (A1e6) | x | - |
| Brakepad wear display | Front SAM control unit with fuse and relay module (N10/1) | CAN B/CAN HMI | - | x | - |
| COLLISION PREVENTION ASSIST (with CODE 258 (COLLISION PREVENTION ASSIST)) | COLLISION PREVENTION ASSIST controller unit (A90) | CAN E1/CAN HMI | DISTRONIC warning lamp (A1e59) | x | x |
| Damping system (with CODE 479 (AMG RIDE CONTROL sports suspension)) | Adaptive damping system control unit (N51/5) | CAN E1/CAN HMI | - | x | - |
| DISTRONIC PLUS (with CODE 239 (DISTRONIC PLUS)) | DISTRONIC electric controller unit (A89) | CAN E1/CAN HMI | DISTRONIC warning lamp (A1e59) | x | x |
| Parking system (up to 30.11.2018 With Code 220 (PARKTRONIC)) | Parking system control unit (N62) | CAN E2/CAN HMI | - | x | x |
| Parking system (as of 01.12.2018 With Code 220 (PARKTRONIC)) | Parking system control unit (N62) | Flex AMG/CAN HMI | - | x | x |
| Electronic Stability Program (ESP®) | Electronic Stability Program control unit (N30/4) | CAN E1/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 | Electric parking brake control unit (N128) | CAN E1/CAN HMI | Parking brake indicator lamp (A1e10), Parking brake warning lamp (A1e11) |
x | - |
| Windshield washer system fluid level | Front SAM control unit with fuse and relay module (N10/1) | CAN B/CAN HMI | - | x | - |
| Speed warning (Gulf states version) | Instrument cluster (A1) | Internal | - | x | x |
| Seat belt reminder warning | Supplemental Restraint System control unit (N2/10) | CAN E1/CAN HMI | Seat belt warning lamp (A1e9) | - | x |
| KEYLESS-GO | 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/CAN HMI | - | x | - |
| Coolant level | Front SAM control unit with fuse and relay module (N10/1) | CAN B/CAN HMI | - | x | - |
| Coolant temperature | ME-SFI [ME] control unit (N3/10) | CAN C/CAN E1/CAN HMI | Coolant temperature warning lamp (A1e54) | x | - |
| Power steering | Electronic Stability Program control unit (N30/4) | CAN E1/CAN HMI | Power steering warning lamp (A1e70) | x | - |
| Lights on warning | Front SAM control unit with fuse and relay module (N10/1) | CAN B/CAN HMI | - | x | x |
| Memory adjustment (with CODE P64 (Memory package)) | Driver seat control unit (N32/1) or Front passenger seat control unit (N32/2) |
CAN B/CAN HMI | - | - | x |
| Engine diagnosis | ME-SFI [ME] control unit (N3/10) | CAN C/CAN E1/CAN HMI | Engine diagnosis indicator lamp (A1e58) | x | - |
| Engine oil level warning | ME-SFI [ME] control unit (N3/10) | CAN C/CAN E1/CAN HMI | - | x | - |
| Emergency call system (with CODE 348 (Emergency call/assist system)) | Emergency call system control unit (N123/4) | CAN D/CAN B/CAN HMI | - | x | - |
| Emergency call system (With Code 350 (eCall Europe emergency call system)) | Telematics services communications module (N112/1) | CAN D/CAN B/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 B/CAN HMI | - | x | - |
| PRE-SAFE® (With Code 299 (PRE-SAFE® system)) | Left reversible emergency tensioning retractor (A76) or Right reversible emergency tensioning retractor (A76/1) |
CAN E1/CAN HMI | Supplemental restraint system indicator lamp (A1e15) | x | - |
| RACE START | AMG gateway control unit (N93/9) | HMI CAN | ESP SPORT indicator lamp (A1e46) | x | - |
| Tire pressure monitoring system (With Code 475 (Tire pressure monitoring system)) | Tire pressure monitor control unit (N88) | HMI CAN | Tire pressure monitor warning lamp (A1e66) | x | - |
| Lane Keeping Assist (with CODE 22P (Lane package)) | Multifunction camera (A40/11) | CAN E2/CAN HMI | - | x | - |
| Supplemental restraint system | Supplemental Restraint System control unit (N2/10) | CAN E1/CAN HMI | Supplemental restraint system indicator lamp (A1e15) | x | - |
| Fuel cap warning (With Code 494 (USA version)) | ME-SFI [ME] control unit (N3/10) | CAN C/CAN E1/CAN HMI | Fuel reserve warning light (A1e4) | x | - |
| Cruise control | Electronic Stability Program control unit (N30/4) | CAN E1/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 E1/CAN HMI | - | x | x |
| Doors OPEN warning | Front SAM control unit with fuse and relay module (N10/1) Rear SAM control unit with fuse and relay module (N10/2) Left door control unit (N69/1) Right door control unit (N69/2) |
CAN B/CAN HMI | - | x | x |
| Soft top control (model 190.4) | Soft top control unit (N52) | CAN B | - | x | x |
| Traffic Sign Assist (with CODE 513 (Traffic Sign Assist)) | Multifunction camera (A40/11) | CAN E2/CAN HMI | - | x | - |
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 about the status of the driver and front passenger seat belts via chassis CAN 1, the AMG gateway 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 corresponding information for seat occupancy recognition via chassis CAN 1, the AMG gateway control unit and user interface CAN to the instrument cluster.
If a seat belt is not fastened, the supplemental restraint system control unit sends a corresponding signal via chassis CAN 1, the AMG gateway control unit and 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 and Canada.
Countries without seat belt reminder warning prescribed by law:
European New Car Assessment Program (Euro NCAP): Europe, China, Australia, Japan, Arab States of the Gulf and Korea.
In countries in which the seat belt reminder is prescribed by law (extended NCAP), the seat belt warning display is actuated for a period 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 fitted during this time interval, the acoustic warning is canceled.
An assessment of whether the front passenger seat belt is fitted or not given during this time interval. Only after the time interval of t = 6 s has expired, does the assessment of both seat belts occur. 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 successive acoustic warnings 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 acoustic warnings are being issued, the seat belt warning lamp flashes on and off 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 is issued at an interval of t = 4 s. Acoustic warning phase 1 lasts for a max of t = 20 s. Acoustic warning phase 2 then begins.
Warning tone phase 2:
After expiry of acoustic warning phase 1 and from a speed of v ≥ 25 km/h, a quiet acoustic warning is issued for a maximum of t = 20 s at an interval of t = 2 s. Acoustic warning phase 3 then begins.
Warning tone phase 3:
After expiry of acoustic warning phase 2 and from a speed of v ≥ 25 km/h a quiet acoustic warning is issued for a maximum of t = 20 s at an interval of t = 1 s. Acoustic warning phase 4 then begins.
Acoustic warning phase 4 (Euro NCAP only):
After expiry of acoustic warning phase 3 and from a speed of v ≥ 25 km/h a loud acoustic warning is issued 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-2054-97HBA | ||
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996RR |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.