GF54.30-P-2001RIA Indicator/Warning Messages, Function
GF54.30-P-2001RIA Indicator/warning Messages, Function
Indicator/warning messages, general
The indicator and warning messages of the instrument cluster (A1) are intended to inform the driver about the current statuses of the systems installed in the vehicle.
The instrument cluster can output indicator and warning messages in the following ways:
^ Visual indicator/warning messages
^ Acoustic indicator/warning messages
Visual indicator/warning messages
- Left multifunction display (A1p13)
- Right multifunction display (A1p15)
- Various indicator/warning lamps
Acoustic indicator/warning messages
The acoustic signals are generated as follows:
- Actuation of internal speaker:
"Gong" at a frequency of f = 1 Hz
- Actuation of internal warning buzzer (A1h1):
Warning tone at a frequency of f = 2.5 Hz
- Actuation of audible turn signal indicator (A1h2):
Turn signal knocking
The messages output in the left multifunction display or right multifunction display are subdivided into three different priority levels: A symbol is displayed in the left multifunction display and the corresponding fault text is displayed in the right multifunction display.
Category 1 fault messages are fault/warning messages of the highest priority. These messages cannot be acknowledged and canceled using the instrument illumination brightness control and reset button (A1r1). When they occur, a brief gong or a cyclical warning tone is output. The message is displayed in the le multifunction display and any category 2 or 3 fault messages present are faded out.
Category 2 fault messages are fault/warning messages of medium priority. These messages can be acknowledged using the instrument illumination brightness control and reset button. A brief warning gong is additionally sounded
Category 3 fault messages are fault/warning messages of the lowest priority.
These messages can be acknowledged using the instrument illumination brightness control and reset button.
No additional warning tone is output in this case.
The following systems and functions can request indicator/warning messages via the instrument cluster:
Systems:
^ Cruise control
^ Variable speed limiter (not with code (494) USA version)
^ Distronic (with code (219) Distronic (DTR))
^ Sensotronic Brake Control (SBC)
^ Supplemental restraint system
^ Exterior lighting
^ Tire pressure loss warning (with code (477) Tire pressure loss warning)
^ Tire pressure monitor(with code (470) Tire pressure monitor (standard) or with code (475) Tire pressure monitor (premium))
^ Emergency call system (TELEAID) (with code (359) TELE AID emergency call system)
^ Memory adjustment
^ Keyless Go (with code (889) Keyless Go)
^ Navigation
^ Transmission control
^ Suspension control (with code (487) Active Body Control (ABC))
^ Engine management
^ Vario roof control
Functions:
^ Parking brake warning
^ Speed warning (with code (623) Gulf states version)
^ Engine oil level warning
^ Brake wear indicator
^ Brake fluid level indicator
^ Coolant level warning
^ Coolant temperature warning
^ Windshield washer system fluid level
^ Audio displays
^ Communication displays (with code (386) Preinstallation for cell phone universal portable CTEL interface system)
^ Turn signal confirmation
^ Tank cap open warning message (with code (494) USA version)
Additional function requirements for cruise control
^ Vehicle speed v > 30 km/h
Cruise control function sequence
If the cruise control is activated via the CC [TPM] push button (S40) (without code (219) Distronic (DTR)), the current set speed is permanently displayed in the left multifunction display.
Additional function requirements for variable speed limiter
^ Vehicle speed v > 30 km/h
Variable speed limiter function sequence
If the variable speed limiter is activated, the set speed is displayed in the left multifunction display for t = 5 s (e.g.: "Variable speed limiter 160 km/h"). The left multifunction display then returns to the menu level set by the driver.
Additional function requirements for Distronic
^ Vehicle speed v > 30 km/h
Distronic function sequence
All information relevant to Distronic is displayed by the left multifunction display and right multifunction display. If Distronic is activated, e.g. at v = 130 km/h, via the CC [TPM] push button (S40/4), the selected speed is permanently displayed in the left multifunction display.
In the right multifunction display, the driver's own vehicle is shown on the right edge of the screen as well as a distance scale to the vehicle ahead. The bar below the distance scale marks the target distance selected with the DTR distance potentiometer (N72r1). If Distronic detects that a vehicle ahead is moving more slowly via the DTR controller unit (A89), a corresponding signal is sent to the instrument cluster via engine compartment CAN.
The instrument cluster then actuates the DTR warning and indicator lamp (A1e59) and a second vehicle which moves slowly over the distance scale appears on the left of the screen in the right multifunction display.
Additional function requirements for SBC
^ Circ. 15 ON
SBC function sequence
If the ESP function is set to "Sport" or switched off via the Drive Unit ESP Sport OFF button (S193/1), this is indicated by the ESP and ABS warning lamp (A1e41) lighting up permanently. In addition, the respective setting is displayed in the left multifunction display and right multifunction display:
- "ESP" "Sport"
- "ESP" "Off"
- "ESP" "On"
The respective messages can be acknowledged and canceled. When the ESP is switched off, the ESP OFF indicator lamp (A1e30) is also actuated.
A fault is displayed via the ABS indicator lamp (A1e17) and via the multifunction displays.
The signals from the Drive Unit ESP Sport OFF button are read in directly by the Drive Unit control unit (N145) and made available to the instrument cluster via interior CAN.
Additional function requirements for supplemental restraint system
^ Circ. 15 ON
Supplemental restraint system function sequence
If a fault is found by the restraint systems control unit (N2/7), the airbag indicator and warning lamp (A1e15) is actuated by the instrument cluster.
If a seat belt is not buckled, the seat belt warning lamp (A1e9) either flashes or lights up permanently depending on the national version. As of a speed of v > 0 km/h, a warning tone also sounds.
Additional function requirements for exterior lights
^ Circuit 58 ON
Exterior lights function sequence
If circuit 15C is switched off and/or the driver door is opened with the standing lights or low beams switched on, a warning tone is output by the warning buzzer.
Additional function requirements for tire pressure monitor
^ Circ. 15 ON
Tire pressure monitor function sequence
If the TPM [RDK] control unit (N88) detects a relevant pressure loss at one or more tires, this is reported to the driver by a corresponding warning message in the instrument cluster.
Additional function requirements for tire pressure loss warning
^ Circ. 15 ON
Tire pressure loss warning function sequence
If the ESP, SPS [PML] and BAS control unit (N47-5) detects a pressure loss based on differences in the tire rolling circumferences, a corresponding message is output in the instrument cluster.
Function sequence of emergency call system
If the emergency call system control unit (N123/4) detects a defect during its self-test or if the emergency call system is activated, a message is output in the instrument cluster.
Memory adjustment function sequence
The instrument cluster outputs an acknowledgement tone when a memory position is stored.
The request to output this acknowledgement tone is transmitted by the left front seat adjustment control unit with memory (N32/1) or by the right front seat adjustment control unit with memory (N32/2) to the instrument cluster via the interior CAN.
Keyless Go function sequence
The instrument cluster is automatically activated as soon as the transmitter key (A8/1) is detected. In addition, a corresponding message is output in the instrument cluster if a door is open or if the selector lever is not in position "P".
The instrument cluster receives the position of the selector lever from the electronic selector lever module control unit (N15/5) via engine compartment CAN.
Additional function requirements for navigation
^ Circ. 15 ON
Navigation function sequence
In the "NAV" display level, information from the navigation system installed in the vehicle is displayed. This depends on the information that the instrument cluster receives from the COMAND operating, display and controller unit (A40/3) via the interior CAN. The various displays are activated by selecting the "Navi" level in the left multifunction display. Text and symbol-based information is then displayed in the right multifunction display.
If communication to COMAND cannot be established, the message "NAV (----)" appears in the left multifunction display.
Additional function requirements for transmission control
^ Circ. 15 ON
Transmission control function sequence
The current gear range and the current transmission mode are shown in the right multifunction display. The gear range is on the left-hand edge of the display and the transmission mode on the right-hand edge. The display shows the respective shift range or the selector lever position ("D" to "P"), and the selected transmission mode ("C", "S" or "M"). The instrument cluster receives the information for this from the fully integrated transmission control unit (VGS) (Y3/8n4) via engine compartment CAN.
Additional function requirements for suspension control
^ Circ. 15 ON
Suspension control function sequence
If the ABC control unit (N51/2) in the Active Body Control system detects a fault or malfunction, it transmits a corresponding signal to the instrument cluster via engine compartment CAN. A warning message is then output in the instrument cluster.
Additional function requirements for engine control
^ Circuit 15 On
Engine control function sequence
If there is a fault in the injection system, ignition system or exhaust system, the engine diagnosis indicator lamp (A1e58) (without code (494) USA version) or the CHECK ENGINE indicator lamp (A1e26) (with code (494) USA version) is actuated. The request for actuation is transmitted to the instrument cluster by the ME-SFI [ME] control unit (N3/10) via engine compartment CAN.
Additional function requirements for Vario roof control
^ Circ. 15 ON
Vario roof control function sequence
If the RVC control unit (N52) detects a fault with the Vario roof control, it transmits a corresponding signal to the instrument cluster via engine compartment CAN. A warning message is then output in the instrument cluster.
Additional function requirements for parking brake on reminder warning
^ Vehicle speed v > 5 km/h
Function sequence of parking brake warning
If the parking brake indicator switch (S12) is actuated at a speed v > 5 km/h, an acoustic warning is output via the warning buzzer and the brake fluid and parking brake warning lamp (A1e7) is actuated. The warning buzzer is shut off again at a speed of v < 2.5 km/h.
The driver-side SAM control unit (N10/10) reads in the signal from the parking brake indicator switch and forwards the information on to the instrument cluster via interior CAN.
Additional function requirements for vehicle speed warning
^ Vehicle speed v > 120 km/h
Vehicle speed warning function sequence
An acoustic warning is output by the warning buzzer at speeds of v > 120 km/h.
The acoustic warning is disabled at speeds of v < 117 km/h. The left front rpm sensor (L6/1), right front rpm sensor (L6/2), left rear rpm sensor (L6/3) and right rear rpm sensor (L6/4) are used to determine the respective wheel speeds.
The signals are read in by the SBC hydraulic unit (A7/3) and forwarded to the ESP, SPS [PML] and BAS control unit (N47-5). From here, the signals are made available to the instrument cluster via engine compartment CAN.
The instrument cluster calculates the vehicle speed based on the wheel speeds
Additional function requirements for engine oil level warning
^ Circuit 15 On
^ Circuit 61 OFF
Engine oil level warning function sequence
The oil level check switch is fitted in the oil pan to monitor the engine oil level (S43).
It is read in by the ME-SFI [ME] control unit. Where necessary, the ME-SFI [ME] control unit transmits a message to the instrument cluster via engine compartment CAN.
The instrument cluster then outputs a visual warning message via the right multifunction display.
Additional function requirements for brake wear indicator
^ Circuit 15 On
Brake wear indicator function sequence
The passenger-side SAM control unit (N10/11) detects the wear of the front brake pads via the right front brake pad contact sensor (S10/2).
The rear SAM control unit (N10/8) detects the wear of the rear brake pads via the right rear brake pad contact sensor (S10/4). A warning message is output via the instrument cluster if the wear is excessive.
Additional function requirements for brake fluid level indicator
^ Circuit 15 On
Brake fluid level indicator function sequence
An excessively low fill level of the brake fluid reservoir is detected by the brake fluid indicator switch (S11) and transmitted by the driver-side SAM control unit to the instrument cluster via interior CAN.
The instrument cluster then outputs a warning message via the brake fluid and parking brake warning lamp.
Additional function requirements for coolant level warning
^ Circuit 15 On
Coolant level warning function indicator
If the level of the coolant is too low, the coolant level indicator switch (S41) transmits a signal to the passenger-side SAM control unit which forwards this signal to the instrument cluster via interior CAN.
The instrument cluster then outputs a visual warning via the right multifunction display.
Additional function requirements for coolant temperature warning
^ Circuit 15 On
Coolant temperature warning function sequence
The sensor which records the coolant temperature is the coolant temperature sensor (B11/4). The ME-SFI [ME] control unit reads in the temperature sensor and forwards this information to the instrument cluster via engine compartment CAN.
The current temperature of the coolant is displayed via the coolant temperature display (A1p1).
When a coolant temperature of T > 130 °C is reached, the coolant temperature warning lamp (A1e54) is actuated and a warning message is issued via the left multifunction display.
Additional function requirements for fluid level of windshield washer system
^ Circuit 15 On
Windshield washer system fluid level function sequence
If the fill level of the washer fluid reservoir is too low, this is detected by the windshield washer system washer fluid indicator switch (S42), read in by the passenger-side SAM control unit and made available to the instrument cluster.
The instrument cluster then outputs a warning via the left multifunction display.
Additional function requirements for audio displays
^ Circuit 15 On
Audio display function indicators
The audio display is activated by selecting the "Audio" display level in the left multifunction display. The information then appears in the right multifunction display (e.g. "SWR3").
The display information depends on the information that the instrument cluster receives from COMAND.
Additional function requirements for communication displays
^ Circuit 15 On
Communication display function sequence
The communication display is activated by selecting the "TEL" display level in the left multifunction display.
The corresponding information then appears in the right multifunction display (e.g. telephone book entries).
The information in the communication displays depends on the information that the instrument cluster receives from COMAND. If the instrument cluster cannot establish communication to COMAND, the display "TEL (----)" appears in the left multifunction display.
Turn signal confirmation function sequence
The visual feedback takes place via the left turn signal indicator lamp (A1e1) and right turn signal indicator lamp (A1e2). The instrument cluster actuates the indicator lamps at the same rate as the turn signals.
Additional function requirements for tank cap open warning message
^ Vehicle speed v > 5 km/h
Tank cap open warning message function sequence
If at a vehicle speed of v > 5 km/h, the instrument cluster receives a message from the ME-SFI [ME] control unit via the engine compartment CAN that the tank cap is still open, the fuel reserve warning lamp (A1e4) is actuated so that it flashes at a frequency of f = 2.5 Hz. The message "Tank cap open" appears at the same time in the instrument cluster.
