Control/warning messages, function - GF54.30-P-2001FLM
MODEL 212 as of model year 2014
Function requirements, general
- Circuit 15R ON
The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 over interior CAN (CAN B) 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 indicator and warning messages are displayed using the following instrument cluster components:
- Multifunction display (A1p13)
- Indicator/warning lamps
Audible control/warning messages:
The acoustic indicator and warning messages are issued using the following instrument cluster components:
- Warning buzzer (A1h1)
- Turn signal ticking via function check for turn signal lights, acoustic (A1h2)
MODEL 212 (except 212.074/075/076/092/274/275/276/292)
Model 212.074/075/076/092/274/275/276/292
The messages shown on the multifunction display are split up according to their level of urgency into four categories:
- 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 displayed and automatically archived in the message memory within a maximum of t = 2 s after they occur, and cannot be acknowledged. When they occur, a brief warning is emitted by the buzzer.
- Category 2 (messages with medium priority)
Messages in category 2 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 warning is emitted by the buzzer.
- Category 3 and 4 (messages with low priority)
These messages are menu displays and only serve as information for 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 and 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
- Acoustic:
- Warning buzzer
- Turn signal light function check, acoustic
The instrument cluster is connected to the vehicle electronics system via the interior CAN and chassis CAN 2 (CAN E2).
Requests to issue control and warning messages from control units that are connected to this CAN, are read in by the instrument cluster via the interior CAN or chassis CAN 2.
Requests to issue control and warning messages from control units that are connected to the diagnostic CAN (CAN D) or chassis CAN 1 (CAN E1), are sent by the front SAM control unit via chassis CAN 2 to the instrument cluster.
Requests to issue control and warning messages from control units that are connected to the chassis FlexRay (Flex E) are sent by the chassis gateway control unit (N93/7) (with CODE 23P (Driving assistance package Plus)) via chassis CAN 2 to the instrument cluster. Requests to issue control and warning messages from control units that are connected to the drive train CAN (CAN C) or hybrid CAN (CAN L), are sent by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI control unit (N3/10) (with gasoline engine) via chassis CAN 1, the front SAM control unit and chassis CAN 2 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 | |||
| ADAPTIVE BRAKE | Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/075/076/092/095/098/274/275/276/292/298) except CODE 233 (DISTRONIC PLUS)) or regenerative braking system control unit (N30/6) (model 212.095/098/298) or Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/075/076/092/274/275/276/292) | CAN E1 | Antilock braking system indicator lamp (A1e17), Electronic Stability Program warning lamp (A1e41), Brake system warning lamp (A1e51) | X | - |
| Adaptive Highbeam Assist Plus (with CODE 608 (Adaptive Highbeam Assist) or CODE 628 (AUTOMATIC HIGH BEAM CONTROL PLUS (IHC+))) | Multifunction camera (A40/11) Stereo multifunction camera (A40/13) |
CAN E2 Flex E/CAN E2 |
- | X | - |
| Active Lane Keeping Assist (with CODE 238 (Active Lane Keeping Assist)) | Stereo multifunction camera (A40/13) | Flex E/CAN E2 |
- | X | - |
| Active Blind Spot Assist (with CODE 237 (Active Blind Spot Assist)) | Radar sensors control unit (N62/1) | Flex E/CAN E2 |
- | - | X |
| Trailer recognition (with CODE 550 (Trailer hitch)) | Trailer recognition control unit (N28/1) | CAN B | - | X | - |
| Audio/Navigation/Communication | Radio (A2) (with CODE 523 (MB Audio 20 radio) or CODE 510 (Audio 20 with CD changer) or CODE 505 (20 NTG5 radio without navigation capability) or CODE 522 (Audio 20 radio)) or COMAND controller unit (A40/3) (with CODE 512 (COMAND APS incl. DVD changer) or CODE 526 (COMAND with single DVD drive (without navigation)) or CODE 527 (COMAND APS with single DVD drive (with navigation)) or CODE 528 (COMAND incl. DVD changer) or CODE 531 (COMAND APS)) | CAN B | - | X | - |
| Attention assistance system | Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/075/076/092/095/098/274/275/276/292/298) except CODE 233 (DISTRONIC PLUS)) or regenerative braking system control unit (N30/6) (model 212.095/098/298) or Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/075/076/092/274/275/276/292) | CAN E1 | - | X | X |
| Exterior lights (ABL) | Front SAM control unit with fuse and relay module (N10/1), Rear SAM control unit with fuse and relay module (N10/2), Left front door control unit (N69/1), Left front door control unit (N69/2) Trailer recognition control unit (N28/1) (with CODE 550 (Trailer hitch)) or |
CAN B | Low beams indicator lamp (A1e67), high beams indicator lamp (A1e3) | X | X |
| Left headlamp control unit (E1n9) and right headlamp control unit (E2n9) | CAN E2 | X | - | ||
| Automatic transmission control | Intelligent servo module for DIRECT SELECT (A80) (with transmission 722.9) Fully integrated transmission control unit (Y3/8n4) (with transmission 722.9, 724.2, 725) |
CAN C / CANE1 | - | X | - |
| BAS PLUS (with CODE 268 (EXTENDED BRAKE ASSIST (BAS+)) or CODE 269 (BRAKE ASSIST PLUS, CROSS-TRAFFIC)) | Radar sensors control unit (N62/1) Stereo multifunction camera (A40/13) | Flex E/CAN E2 |
- | X | - |
| Turn signal confirmation | Front SAM control unit with fuse and relay module (N10/1) | CAN B | Left turn signal light indicator lamp (A1e1), right turn signal light indicator lamp (A1e2) | - | X |
| Brake fluid level | Front SAM control unit with fuse and relay module (N10/1) | CAN B | Brake system warning lamp (A1e51) | X | - |
| Brake wear indicator | Front SAM control unit with fuse and relay module (N10/1) | CAN B | - | X | - |
| COLLISION PREVENTION ASSIST (with CODE 258 (Collision Prevention Assist) or CODE 258 (COLLISION PREVENTION ASSIST PLUS)) | COLLISION PREVENTION ASSIST controller unit (A90) | CAN E1 | COLLISION PREVENTION ASSIST warning lamp (A1e52) | - | X |
| Damping system (with CODE 489 (AIRmatic (air suspension with continuous adjustment damping) or CODE 488 (Steel/air suspension)) | AIRmatic control unit (N51/3) | CAN E1 | - | X | - |
| DISTRONIC PLUS (with CODE 233 (DISTRONIC PLUS)) | Radar sensors control unit (N62/1) | Flex E/CAN E2 | - | X | - |
| DISTRONIC PLUS with Steer Assist (with CODE 266 (Steer Assist)) | Radar sensors control unit (N62/1) | Flex E/CAN E2 |
DISTRONIC warning lamp (A1e59) | - | X |
| Anti-theft alarm system (ATA) (with CODE 551 (Anti-theft alarm system (ATA))) | Rear SAM control unit with fuse and relay module (N10/2) | CAN B | - | X | - |
| Parking system (with CODE 235 (Active Parking Assist)) | Parking system control unit (N62) | CAN E2 | - | X | X |
| Electronic Stability Program (ESP®) | Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/075/076/092/095/098/274/275/276/292/298) except CODE 233 (DISTRONIC PLUS)) or regenerative braking system control unit (N30/6) (model 212.095/098/298) or Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/075/076/092/274/275/276/292) | CAN E1 | ESP®/ASR OFF warning lamp (A1e32) (ESP® ON/OFF status), Electronic Stability Program warning lamp (A1e41) (ESP® system active), ESP SPORT indicator lamp (A1e46) (model 212.074/075/076/092/274/275/276/292) | X | - |
| Electrical power steering | Electrical power steering control unit (N68) | CAN E2 | - | X | - |
| Natural gas engine (with engine 274.9 with CODE 924 (Bivalent natural gas drive)) | CNG control unit (N118/2) | CAN I | CNG indicator lamp (A1e31) | X | - |
| Parking brake warning | Front SAM control unit with fuse and relay module (N10/1) | CAN B | Brake system warning lamp (A1e51) (except CODE 494 (USA version)), brake fluid and parking brake indicator lamp (A1e6) | X | - |
| Windshield washer system fluid level | Front SAM control unit with fuse and relay module (N10/1) | CAN B | - | X | - |
| Speed warning (with CODE 623 (Gulf States version)) | Instrument cluster (A1) | Internal | - | X | X |
| Seat belt reminder warning | Supplemental restraint system control unit (N2/10) | CAN E1 | Seat belt warning lamp (A1e9) | - | X |
| Rear SAM control unit with fuse and relay module (N10/2) | CAN B | ||||
| HYBRID high-voltage on-board electrical system (on model 212.095/098/298) | Power electronics control unit (N129/1) | CAN L / CANE1 | - | X | - |
| KEYLESS-GO (with CODE 889 (Keyless-Go)) | KEYLESS-GO control unit (N69/5) | CAN B | - | X | X |
| Coolant level | Front SAM control unit with fuse and relay module (N10/1) | CAN B | - | X | - |
| Coolant temperature | CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine) | CAN E1 | - | X | - |
| Lights on warning | Front SAM control unit with fuse and relay module (N10/1) | CAN B | - | X | X |
| Steer Assist (with CODE 266 (Steer Assist)) | Radar sensors control unit (N62/1) Stereo multifunction camera (A40/13) | Flex E/CAN E2 Flex E/CAN E2 |
- | - | - |
| Power steering (with CODE 213 (Speed-sensitive power steering)) | Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/075/076/092/095/098/274/275/276/292/298) except CODE 233 (DISTRONIC PLUS)) or regenerative braking system control unit (N30/6) (model 212.095/098/298) or Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/075/076/092/274/275/276/292) | CAN E1 | - | X | X |
| Memory adjustment (with CODE 275 (Memory package for electrically adjustable front seats)) | Driver seat control unit (N32/1) or front passenger seat control unit (N32/2) | CAN B | - | - | X |
| Engine oil level warning | CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine) | CAN E1 | - | X | - |
| Emergency call system (with CODE 348 (Emergency call/assist system)) | Emergency call system control unit (N123/4) | CAN D / CAN E2 | - | X | - |
| PRE-SAFE® | Left front reversible emergency tensioning retractor motor (A76) or Right front reversible emergency tensioning retractor (A76/1) | CAN E1 | Supplemental restraint system indicator lamp (A1e15) | X | - |
| PRE-SAFE® brake (with CODE 271 (Autonomous brake intervention / pedestrian protection) or CODE 300 (Collision reduction (CMS))) | Radar sensors control unit (N62/1) Stereo multifunction camera (A40/13) | Flex E/CAN E2 | - | X | - |
| RACE START (on model 212.074/092/274/292) | Transmission mode control unit (N145) | CAN E2 | - | X | - |
| Tire pressure monitor (with CODE 475 (Tire pressure monitor (premium)), Schrader) | Tire pressure monitor control unit (N88) | CAN E2 | Tire pressure monitor warning lamp (A1e66) | X | - |
| Tire pressure loss warner (except CODE 475 (Tire pressure monitor (premium), Schrader)) | Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/075/076/092/095/098/274/275/276/292/298) except CODE 233 (DISTRONIC PLUS)) or regenerative braking system control unit (N30/6) (model 212.095/098/298) or Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/075/076/092/274/275/276/292) | CAN E1 | - | X | - |
| Lane Keeping Assist (with CODE 476 (Lane Keeping Assist)) | Multifunction camera (A40/11) | CAN E2 | - | X | - |
| Stationary heater (with CODE 228 (Stationary heater)) | Stationary heater control unit (A6n1) | CAN B | - | X | - |
| Supplemental restraint system | Supplemental restraint system control unit (N2/10) | CAN E1 | Supplemental restraint system indicator lamp (A1e15) | X | - |
| Fuel cap warning (with CODE 494 (USA version)) | CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine) | CAN E1 | Fuel reserve warning light (A1e4) | X | - |
| Cruise control | Electronic Stability Program control unit (N30/4) (model 212 (except 212.074/075/076/092/095/098/274/275/276/292/298) except CODE 233 (DISTRONIC PLUS)) or regenerative braking system control unit (N30/6) (model 212.095/098/298) or Premium Electronic Stability Program control unit (N30/7) (model 212 (except 212.095/098/298) with CODE 233 (DISTRONIC PLUS), model 212.074/075/076/092/274/275/276/292) | CAN E1 | Segment ring on speedometer (A1p8) | X | X |
| Blind Spot Assist (with CODE 234 (Blind Spot Assist)) | Left rear bumper intelligent radar sensor (B29/4), right rear bumper intelligent radar sensor (B29/5) | CAN E1 | - | - | 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 front door control unit (N69/1), Right front door control unit (N69/2), left rear door control unit links (N69/3), right rear door control unit (N69/4) |
CAN B | - | X | X |
| Traffic Sign Assist (with CODE 513 (Traffic sign recognition)) | Multifunction camera (A40/11) Stereo multifunction camera (A40/13) |
CAN E2 Flex E/CAN E2 |
- | X | - |
| Preglow indicator (on diesel engine) | CDI control unit (N3/9) | CAN E1 | Preglow indicator lamp (A1e16) | - | - |
| Rear window wiper system (model 212.2) | Front SAM control unit with fuse and relay module (N10/1) | CAN B | - | 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 instrument cluster evaluates the following information for issuing a country-specific seat belt reminder warning:
- Sent by supplemental restraint system control unit (N2/10) via chassis CAN 1:
- Status of driver seat belt buckle restraint system switch (S68/3)
- Status of front passenger seat belt buckle restraint system switch (S68/4)
- Front passenger seat occupied status
- Sent by the rear SAM control unit via the interior CAN:
- Status of left rear seat belt buckle switch (S68/5)
- Status of right rear seat belt buckle switch (S68/6)
- Status of center rear seat belt buckle switch (S68/14)
The seat belt reminder message for the front passenger is only issued, if the front passenger seat is recognized as occupied.
The rear seat belt reminder warning is only issued, if the status of a rear seat belt buckle switch changes during a journey.
If a seat belt that is not fitted is detected, the supplemental restraint system control unit sends a corresponding signal over the chassis CAN 1, front SAM control unit and chassis CAN 2 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, Korea and Arab States of the Gulf.
In countries in which the seat belt reminder is prescribed by law (extended NCAP), the seat belt warning lamp is activated 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 being worn, the instrument cluster also issues an acoustic warning over the warning buzzer.
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 reminder warning is not prescribed by law, the seat belt warning lamp is only actuated during the indicator lamp test.
Immediately after detecting an engine start ("Engine running" or "Drivetrain operational" signal set), both the status of the driver restraint system seat belt buckle switch and the status of the front-passenger restraint system seat belt buckle switch are 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, additional 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 they are being issued the seat belt warning lamp is actuated by flashing it 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 acoustic warning is sounded at an interval of t = 4 s. The acoustic warning phase 1 lasts for a maximum t = 20 s. This is then followed by a transition to acoustic warning phase 2.
Acoustic warning phase 2:
After expiry of acoustic warning phase 1 and at a speed of v ≥25 km/h, a quiet warning tone is sounded for max. t = 20 s at an interval of t = 2 s.
The transition into warning phase 3 follows.
Acoustic warning phase 3:
Following expiry of acoustic warning phase 2 and as of a speed of v ≥ 25 km/h, a quiet acoustic warning is sounded for maximum t = 20 s at an interval of t = 1 s. This is then followed by a transition to acoustic warning phase 4.
Acoustic warning phase 4 (Euro NCAP only):
Following expiry of acoustic warning phase 3 and as of a speed of v ≥ 25 km/h, a loud acoustic warning is sounded for maximum 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.
The rear seat belt reminder warning is realized by monitoring the number of belt tabs inserted into the seat belt buckles.
If this situation alters during a journey or at vehicle standstill, without a rear door being opened, the instrument cluster actuates the seat belt warning lamp and the warning buzzer to issue the rear seat belt reminder warning.
If the seat belt reminder warning is issued when the vehicle is moving, it is displayed again another t = 30 s when the vehicle is determined to be at rest. This is contingent on a change in the door status for a rear door while the vehicle is at a standstill. The rear seat belt reminder warning, however, does not exert any effect on restraint equipment deployment, it only serves as information for the driver.
| Electrical function schematic of instrument cluster, control/warning message | PE54.30-P-2054-97DAB | ||
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996FL |