Control/warning messages, function - GF54.30-P-2001CA
MODEL 207.3/4 up to model year 2014
Function requirements, general
- Circuit 15R ON
The electronic ignition lock control unit (N73) transmits the circuit status of circuit 15 via 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)
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 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 (CAN E).
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.
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) via the interior CAN to the instrument cluster.
Requests to issue control and warning messages from control units which are connected to the vehicle dynamics CAN (CAN H) are sent by the radar sensors control unit (N62/1) (up to 31.5.11) or the video and radar sensor system control unit (N62/2) (as of 1.6.11) via 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 following systems and functions listed in the table 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) (without code (233) DISTRONIC PLUS) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS) | CAN-E | Antilock brake 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 Lane Keeping Assist (with code (238) Active Lane Keeping Assist) | Multifunction camera (A40/11) | CAN-E | - | X | - |
| Active Blind Spot Assist (with code (237) Active Blind Spot Assist) | Video and radar sensor system control unit (N62/2) | CAN-E | - | - | 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 radio with auto pilot system (A2/56) (with code (525) MB Audio 50 APS radio or code (511) Audio 50 APS incl. DVD changer) or COMAND controller unit (A40/3) (with code (526) COMAND (without navigation) or code (527) COMAND APS with single DVD drive (with navigation) or code (528) COMAND incl. DVD changer or code (512) COMAND APS incl. DVD changer) | CAN B | - | X | - |
| Attention assistance system | Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS) | 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) Front fog lamp indicator lamp (A1e57) (with code (498) Japan version or without code (615) Bi-xenon headlamp unit with integrated curve illumination and without code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination and without code (621) Intelligent Light System (left-hand traffic) and without code (622) Intelligent Light System (right-hand traffic)) | X | X |
| Left xenon light control unit (E1n1) and right xenon light control unit (E2n1) (with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic)) | CAN G/CAN B | X | - | ||
| Automatic lane recognition (with code (476) Lane Keeping Assist) | Multifunction camera (A40/11) | CAN-E | - | X | - |
| Automatic transmission control (with transmission 722) | Electronic selector lever module control unit (N15/5) and Electronic transmission control unit (N15/3) (with transmission 722.6) or Fully integrated transmission control unit (Y3/8n4) (with transmission 722.9) | CAN C/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 |
| 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 |
| Antitheft alarm system (ATA [EDW]) (with code (551) Antitheft 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 or code (220) PARKTRONIC) | PARKTRONIC control unit (N62) | CAN-E | - | X | X |
| Electronic Stability Program (ESP®) | Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS) | CAN-E | ESP®/ASR OFF warning lamp (A1e32) (status ESP® ON/OFF), Electronic Stability Program warning lamp (A1e41) (ESP® system active) | X | - |
| Parking brake warning | Front SAM control unit with fuse and relay module (N10/1) | CAN B | Brake system warning lamp (A1e51) | 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) or ME-SFI [ME] control unit (N3/10) | CAN-E | Coolant temperature warning lamp (A1e54) | X | - |
| Lights on warning | Front SAM control unit with fuse and relay module (N10/1) | CAN B | - | X | X |
| Memory adjustment (with code (275) Memory package (driver seat, steering column, mirrors) or code (242) Electrically adjustable front passenger seat with memory) | 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) or ME-SFI [ME] control unit (N3/10) | CAN-E | - | X | - |
| Engine diagnosis | CDI control unit (N3/9) or ME-SFI [ME] control unit (N3/10) | CAN-E | Engine diagnosis indicator lamp (A1e58) | X | - |
| Emergency call system (with code (348) Emergency call/Assist system or code (359) TELEAID emergency call system) | Emergency call system control unit (N123/4) | CAN D/CAN B | - | X | - |
| PRE-SAFE | Left front reversible emergency tensioning retractor motor (A76) or Right front reversible emergency tensioning retractor (A76/1) | CAN-E | - | X | - |
| Tire pressure monitor (with code (475) Tire pressure monitor (Premium), manufactured by Schrader) | Tire pressure monitor control unit (N88) | CAN-E | Tire pressure monitor warning lamp (A1e66) | X | - |
| Tire pressure loss warner (without code (475) Tire pressure monitor (premium)) | Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS) | CAN-E | - | 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) or ME-SFI [ME] control unit (N3/10) | CAN-E | Fuel reserve warning light (A1e4) | X | - |
| Cruise control | Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS) | CAN-E | Segment ring in speedometer (A1p8) | X | X |
| Blind Spot Assist (for code (234) Blind Spot Assist) | Left rear bumper intelligent radar sensor (B29/4) or right rear bumper intelligent radar sensor (B29/5) | CAN G/CAN B | - | - | X |
| Door warning (doors, engine hood, trunk lid) | 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) and right front door control unit (N69/2) | CAN B | - | X | X |
| Soft top (model 207.4) | Rear control unit (N22/6) | CAN B | X | - | |
| Preglow indicator (on diesel engine) | CDI control unit (N3/9) | CAN-E | 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 instrument cluster evaluates the following information for issuing a country-specific seat belt reminder warning:
- Transmitted by Supplemental Restraint System control unit (N2/10) via chassis CAN:
- 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 rear SAM control unit with fuse and relay module (N10/2) via interior CAN:
- Status of left rear seat belt buckle switch (S68/5)
- Status of right rear seat belt buckle switch (S68/6)
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 is not being worn, the Supplemental Restraint Systems control unit sends a corresponding signal 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, Arab States of the Gulf and up to 31.5.12 Japan and Korea.
Countries without seat belt reminder warning prescribed by law:
European New Car Assessment Program (Euro NCAP):
Europe, China, Australia, Canada and as of 1.6.12 Japan and Korea.
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 X 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:
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. This is then followed by a transition to acoustic warning phase 3.
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 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 "Drivetrain 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-2054-97EAA | ||
| Overview of system components, instrument cluster (IC) component description | GF54.30-P-9996CA |