Control/Warning Messages, Function - GF54.30-P-2001RD
Model 172.4
up to model year 2017
Function requirements, general
- Circuit 15R ON
The circuit 15 status is sent by the electronic ignition lock control unit (N73) over the chassis CAN (CAN E) 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 output of control/warning messages:
- Multifunction display (A1p13)
- Indicator/warning lamps
- Acoustic output of control/warning messages
- Warning buzzer (A1h1)
- Turn signal ticking via function check for turn signal lights, acoustic (A1h2)
Shown on model 172.403
The following components integrated in the instrument cluster are not shown:
- Warning buzzer
- Turn signal light function check, acoustic
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 overlaid by the new message after the minimum display time has elapsed.
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 over the interior CAN (CAN B) and chassis CAN t the vehicle electronics.
Requests for displaying indicator and warning messages from control units connected to this CAN are read in by the instrument cluster over the interior CAN or the chassis CAN.
Requests to issue control and warning messages from control units that are connected to the diagnostic CAN (CAN D) or front end CAN (CAN G), are sent by the front SAM control unit with fuse and relay module (N10/1) over the chassis CAN to the instrument cluster. Requests to issue control and warning messages from control units which are connected to the drive train CAN (CAN C) are sent by the CDI control unit (N3/9) (with diesel engine) or ME-SFI control unit (N3/10) (with gasoline engine) via the chassis 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 | |||
| ADAPTIVE BRAKE | Electronic Stability Program control unit (N30/4) | CAN-E | Antilock braking system indicator lamp (A1e17), Electronic Stability Program warning lamp (A1e41), Brake system warning lamp (A1e51) | x | |
| Adaptive Highbeam Assist (with code 608 (Adaptive Highbeam Assist)) | Multifunction camera (A40/11) | CAN-E | x | ||
| Active Blind Spot Assist (with code 237 (Active Blind Spot Assist)) | Radar sensors control unit (N62/1) | CAN-E | x | ||
| Automatic lane recognition (with code (476) (Lane Keeping Assist)) | Multifunction camera (A40/11) | CAN-E | - | x | - |
| Audio/Navigation/Communication | Radio (A2) (with code 523 (Audio 20 CD) or code 510 (Audio 20 CD with 6-disk CD changer)) or COMMAND controller unit (A40/3) (with code 527 (COMMAND APS with single DVD drive (with navigation)) or code 512 (COMMAND APS incl. DVD changer)) | CAN B | x | ||
| Attention assistance system | Electronic Stability Program control unit (N30/4) | CAN-E | - | x | x |
| Exterior lights (ABL) | Front SAM control unit with fuse and relay module (N10/1) | CAN B | High beams indicator lamp (A1e3), Rear fog light indicator lamp (A1e18), Low beam indicator lamp (A1e67) Standing light indicator lamp (A1e38) (for model 172.475 or vehicles as of 01.06.2012), Front fog lamp indicator lamp (A1e57) (except code 615 (Bi-xenon headlamps with active curve lights) and except code 621 (Intelligent Light System (left-hand traffic)) and except code 622 (Intelligent Light System), up to 31.05.2015) |
x | x |
| Headlamp control unit (N71/1) (with code 615 (Bi-xenon headlamps with active curve lights) or code 621 (Intelligent Light System (left-hand traffic)) or code 622 (Intelligent Light System)) | CAN G/CAN E | x | |||
| Turn signal confirmation | Front SAM control unit with fuse and relay module (N10/1) | CAN B | Left turn signal lights indicator lamp (A1e1), Right turn signal indicator lamp (A1e2) | x | |
| Lights on warning | Front SAM control unit with fuse and relay module (N10/1) | CAN B | - | x | x |
| Automatic transmission control (with transmission 722.9, 725.0) | Electronic selector lever module control unit (N15/5) (transmission 722.9), DIRECT SELECT INTERFACE (N150) (transmission 725.0), fully integrated transmission control unit (Y3/8n4) | CAN C/CAN E | 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 | - |
| Damping system (with code 483 (ADVANCED AGILITY package)) | Adaptive damping system control unit (N51/5) | CAN-E | - | x | - |
| DISTRONIC (with code 233 (DISTRONIC PLUS)) | DISTRONIC electric controller unit (A89) | CAN H/CAN E | DISTRONIC warning lamp (A1e59) | - | x |
| Anti-theft alarm system (ATA [EDW]) | Rear SAM control unit with fuse and relay module (N10/2) | CAN B | - | x | - |
| Parking system (with code 230 (Exclusive parking assist)) | Parking system control unit (N62) | CAN-E | - | x | x |
| Electronic Stability Program (ESP®) | Electronic Stability Program control unit (N30/4) | CAN-E | ESP®/ASR OFF warning lamp (A1e32) (status ESP® ON/OFF), Electronic Stability Program warning lamp (A1e41) (ESP® system active) | x | |
| Window warning (with code 494 (USA version)) | Vario roof control unit (N52) | CAN B | - | x | x |
| Parking brake warning | Electric parking brake control unit (N128) | CAN-E | 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 | - | x | - |
| Speed Limit Assist (with code 513 (Speed Limit Assist)) | Multifunction camera (A40/11) | CAN-E | - | 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-E | Seat belt warning lamp (A1e9) | - | 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-E | Coolant temperature warning lamp (A1e54) | x | - |
| Memory adjustment (with code 275 (Memory package)) | Driver seat control unit (N32/1) or front passenger seat control unit (N32/2) | CAN B | - | - | x |
| Engine diagnosis | CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine) | CAN-E | Engine diagnosis indicator lamp (A1e58) | 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-E | - | x | - |
| Emergency call system (with code 359 (TELEAID emergency call system) or code 348 (Emergency call/assistance system)) | Emergency call system control unit (N123/4) | CAN D/CAN E | x | ||
| PRE-SAFE® (with code 299 (PRE-SAFE® system)) | Left reversible emergency tensioning retractor (A76) or Right reversible emergency tensioning retractor (A76/1) |
CAN-E | Supplemental restraint system indicator lamp (A1e15) | x | |
| Tire pressure loss warning (with code 477 (Tire pressure loss warning)) | Electronic Stability Program control unit (N30/4) | CAN-E | - | x | - |
| Tire pressure monitor (with code 475 (Tire pressure monitor)) | Tire pressure monitor control unit (N88) | CAN-E | Tire pressure monitor warning lamp (A1e66) | x | - |
| Power steering (with code 213 (Direct steering)) | Electronic Stability Program control unit (N30/4) | CAN-E | - | x | x |
| Supplemental restraint system | Supplemental Restraint System control unit (N2/10) | CAN-E | 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-E | Fuel reserve warning light (A1e4) | x | |
| Cruise control | Electronic Stability Program control unit (N30/4) | CAN-E | Segment ring in Speedometer (A1p8) | x | x |
| Blind Spot Assist (with code 234 (Blind Spot Assist)) | Left rear bumper intelligent radar sensor (B29/4), Intelligent radar sensor for right rear bumper (B29/5) |
CAN G/CAN B | 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 | x | x | |
| Vario roof | Vario roof control unit (N52) | CAN B | - | x | x |
| Pre-glow indicator (diesel engine) | CDI control unit (N3/9) (with diesel engine) | CAN-E | Pre-glow indicator lamp (A1e16) | x | 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 on the status of the driver and front passenger seat belts to the instrument cluster over the chassis CAN. The instrument cluster evaluates this information for issuing a country-specific seat belt reminder warn
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 on the seat occupancy recognition over the chassis 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, up to 31.05.2012 Japan and Korea and up to 31.05.2013 Arab States of the Gulf
- Countries without seat belt reminder warning prescribed by law: European New Car Assessment Program (Euro NCAP): Europe, China, Australia, as of 01.06.2012 Japan and Korea and as of 01.06.2013 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 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 being worn, the instrument cluster also issues an acoustic warning over the warning buzzer.
If the driver seat belt is fastened during this period, the acoustic warning is switched off.
An assessment of whether the front passenger seat belt is fitted or not given during this period. Only after the period 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. 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 then starts to move, additional acoustic warnings are issued when a speed of v ≥ 25 km/h is reached.
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. Upon reaching a speed of v > 25 km/h, a soft acoustic warning sounds in intervals of t = 4 s. The acoustic warning phase 1 lasts max. t = 20 s. Then acoustic warning phase 2 begins.
- Acoustic warning phase 2:
Following expiry of acoustic warning phase 1 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 = 2 s. Then acoustic warning phase 3 begins.
- Acoustic warning phase 3:
After expiry of acoustic warning phase 2 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 = 1 s. Then acoustic warning phase 4 begins.
- 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.
| Electrical function schematic of instrument cluster, control/warning message | PE54.30-P-2054-97TAA | ||
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996RD |