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GF54.30-P-2001LEH Indicator/warning Messages, Function
General function requirements
^ Circuit 15R ON
The EZS control unit (N73) transmits the status of circuit 15 over the chassis CAN (CAN E), central gateway control unit (N93) and central CAN (CAN F) to the instrument cluster (A1).
Indicator/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 indicator/warning messages:
The visual indicator and warning messages are displayed using the following instrument cluster components:
- Multifunction display (A1p13) (e.g. variable indicator lamps and warning lamps, indicator/warning messages)
- Indicator/warning lamps
Audible indicator/warning messages:
The acoustic indicator and warning messages are issued using the following instrument cluster components:
- Warning buzzer (A1h1)
- Acoustic turn signal indicator (A1h2)
Variable indicator lamps and warning lamps in multifunction display:
- Electronic parking brake warning lamp (yellow)
- Electric parking brake warning lamp (red)
- Automatic lane recognition indicator lamp (with code (476) Automatic lane recognition)
- Attention Assist indicator lamp
- Speed Limit Assist indicator lamp (with code (513) Speed Limit Assist)
- Left turn signal indicator lamp (A1e1)
- Right turn signal indicator lamp (A1e2)
- Brake fluid warning lamp (A1e7)
- Seat belt warning lamp (A1e9)
- ESP warning lamp (A1e41)
- ESP indicator lamp (A1e42)
- DTR warning lamp (A1e59) (with code (233) DISTRONIC PLUS)
- Tire pressure monitor warning lamp (A1e66)
The messages inserted in the multifunction display are subdivided into four categories corresponding to their urgency:
- Category 1 (messages with highest priority)
Messages in category 1 refer to safety-endangering conditions and situations and are displayed within a maximum of t = 2 s after their occurrence. These messages 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 feedbacks. Category 2 messages can be acknowledged with the left multifunction steering wheel button group (S110). 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 driver information (e.g. low washer fluid level). There is no warning tone. 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.
The indicator/warning messages consist of the following subfunctions:
^ Hybrid readiness indicator function sequence
^ Function sequence for cruise-control control/warning messages
^ Distronic indicator/warning messages function sequence (with code (233) DISTRONIC PLUS)
^ Regenerative braking system control/warning messages function sequence
^ Function sequence for control/warning messages for supplemental restraint system
^ PRE-SAFE warning messages function sequence
^ Function sequence for tire pressure monitor warning messages
^ Memory adjustment control messages function sequence (with code (275) Memory package for electrically adjustable front seats)
^ Function sequence for audio/communication/navigation control messages
^ Function sequence for Keyless-Go control/warning messages (with code (889) Keyless Go)
^ Function sequence for emergency call system control/ warning messages (with code (359) TELE AID emergency call system)
^ Function sequence for control/warning messages for AIRMATIC
^ Function sequence for parking assist control/warning messages (with code (220) PARKTRONIC or code (230) Exclusive parking assist)
^ Function sequence for antitheft alarm system (ATA [EDW]) control/warning messages (with code (551) Antitheft alarm system (ATA [EDW]))
^ Night View Assist warning messages function sequence (with code (610) Night View Assist)
^ Automatic lane recognition control message function sequence (with code (476) Automatic lane recognition)
^ Speed Limit Assist control messages function sequence (with code (513) Speed Limit Assist)
^ Adaptive Highbeam Assist control message function sequence (with code (608) Adaptive Highbeam Assist)
^ Attention assist control/warning messages function sequence
^ Door open reminder warning function sequence
^ Function sequence for warning messages for the exterior lights (ABL)
^ Function sequence for lights on reminder warning
^ Parking brake warning function sequence
^ Function sequence, national seat belt reminder warning
^ Function sequence for coolant level and coolant temperature warning
^ Function sequence, engine oil level warning
^ Function sequence for brake wear indicator warning messages
^ Function sequence for brake fluid level warning messages
^ Function sequence for windshield washer system fluid level warning messages
^ Function sequence, turn signal confirmation
^ Function sequence for engine-control control/warning messages
^ Function sequence for filler cap warning (with code (494) USA version)
Hybrid readiness indicator function sequence
When the ignition is switched on the ME-SFI control unit (N3/10) and battery management system control unit (N82/2) checks the hybrid drive for its function readiness.
If the internal combustion engine is switched off due to a hybrid request, the readiness indicator "Ready" appears in the instrument cluster.
As soon as the internal combustion engine is started again due to a hybrid request, this display disappears.
The battery management system control unit transmits the appropriate information to the instrument cluster via the drive train sensor CAN (CAN I), ME-SFI control unit, chassis CAN, central gateway control unit and central CAN.
Additional function requirements, cruise-control control/ warning messages
^ Vehicle speed v > 30 km/h
The instrument cluster calculates the vehicle speed from the wheel speeds which the regenerative braking system control unit provides (N30/6) via the chassis CAN, central gateway control unit and central CAN.
Function sequence for cruise-control control/warning messages
The cruise control then regulates the vehicle speed to an adjustable value. Cruise control is activated by pressing the cruise control push button (S40/4).
The cruise-control control/warning messages consist of the following subfunctions:
^ Function sequence for cruise control display
^ Function sequence for variable speed limiter display (without code (494) USA version)
^ Permanent limiter display function sequence (without code (494) USA version)
Function sequence for cruise control display
When the cruise control is switched on, the stored speed is displayed for t = 5 s in the multifunction display and displayed by a triangle in the electronic speedometer (A1p8). The scale in the electronic speedometer is shown in the form of an open segment ring. The individual segments symbolize various speed ranges and are actuated with different brightness and color. The segment ring lights up between the set speed and the maximum speed.
Function sequence for variable speed limiter display (without code (494) USA version)
The variable speed limiter governs the vehicle speed to a configurable value that lies between v = 30 km/h and the maximum speed. If the variable speed limiter is switched on, the segment ring in the speedometer lights up between the minimum speed and the set speed limit.
Permanent limiter display function sequence (without code (494) USA version)
The vehicle's maximum speed can be limited permanently on the instrument cluster to a value that lies between v = 160 km/h (e.g. for winter-tire operation) and the maximum speed. A warning message appears in the multifunction display if the set speed is exceeded. The instrument cluster also actuates the warning buzzer. The permanent limiter can only be switched on and off in the corresponding menu in the instrument cluster.
Additional function requirements, Distronic control/warning messages (with code (233) DISTRONIC PLUS)
^ Vehicle speed v > 30 km/h (calculated by instrument cluster)
Distronic indicator/warning messages function sequence (with code (233) DISTRONIC PLUS)
Distronic regulates the vehicle speed so that a minimum distance to the vehicle ahead is maintained.
Distronic is activated by pressing the cruise control push button. If the Distronic is switched on, the stored speed is marked by a triangle in the electronic speedometer. If the Distronic recognizes a vehicle ahead, the segment ring in the speedometer lights up brightly between the speed of the vehicle ahead and the stored speed. In addition, a tracking graphic appears in the multifunction display. In this pursuit graphic one's own vehicle is shown on the right on the edge of the picture as well as the vehicle ahead shown on the left on the edge of the picture.
In addition the following information is displayed:
- Vehicle speed set
- Current distance to vehicle ahead
- Following distance
Additionally, if distance warning is switched on, the distance warning status indication (A1e23) lights up.
If the vehicle drops below the following distance to the vehicle ahead, the DTR control unit (A89) transmits a corresponding signal to the radar sensors control unit (SGR) via the vehicle dynamics CAN (N62/1).
The radar sensors control unit passes on this signal to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. The instrument cluster receives the signal and actuates the DTR warning lamp.
Additional function requirements, regenerative braking system control/warning messages
^ Circuit 15 ON
Regenerative braking system control/warning messages function sequence
Provided that the Electronic Stability Program (ESP) is switched passive, the instrument cluster actuates the ESP indicator lamp. The instrument cluster actuates the ESP warning lamp in the event of an ESP control intervention function.
If the regenerative braking system control unit detects faults in the ESP, the ABS indicator lamp (A1e17) lights up and in addition corresponding messages appear in the multifunction display. The ESP can be switched to passive mode by pressing the ESP OFF switch (S6/2s11) when the engine is running.
The upper control panel control unit (N72/1) reads in the status of the ESP OFF switch via the instrument panel LIN (LIN 1) and transmits it via the interior CAN.
The regenerative braking system control unit transmits malfunction messages and fault messages via the chassis CAN. The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.
With regenerative braking a part of or the total braking torque is produced by the integrated starter alternator (A79). The highvoltage battery is charged with the electrical energy produced in the process (A100g1). The instrument cluster actuates the regenerative braking system indicator lamp (A1e20) during regenerative braking. The ME-SFI control unit transmits the corresponding request to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.
Additional function requirements for supplemental restraint system control/warning messages
^ Circuit 15 ON (sent by EIS (EZS) control unit)
Function sequence for control/warning messages for supplemental restraint system
If there is a fault in the supplemental restraint system, the restraint systems control unit (N2/7) sends corresponding information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.
The instrument cluster receives this information, actuates the airbag indicator and warning lamp (A1e15) and issues appropriate messages via the multifunction display.
Additional function requirements, PRE-SAFE warning messages
^ Circuit 15 ON (sent by EIS (EZS) control unit)
PRE-SAFE warning messages function sequence
If a fault is present in the PRE-SAFE system, the left front reversible emergency tensioning retractor (A76) or right front reversible emergency tensioning retractor (A76/1) transmits corresponding information to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. The instrument cluster receives this information, actuates the supplemental restraint system indicator lamp and outputs corresponding messages via the multifunction display.
Additional function requirements for tire pressure monitor warning messages
^ Circuit 15 ON (sent by EIS (EZS) control unit)
Function sequence for tire pressure monitor warning messages
If the TPM [RDK] control unit (N88) detects a pressure loss in a tire, it transmits corresponding information to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.
The instrument cluster receives this information, actuates the tire pressure monitor warning lamp and issues appropriate messages via the multifunction display.
Function sequence for memory adjustment control messages (with code (275) Memory package for electrically adjustable front seats)
When storing a memory position, the left front seat control unit (N32/1) or right front seat control unit (N32/2) transmits a request to output an acknowledgment tone to the instrument cluster via the interior CAN, central gateway control unit and central CAN. The instrument cluster receives this request and outputs the acknowledgment tone.
Additional function requirements for audio/communication/ navigation control messages
^ Circuit 15 ON (sent by EIS (EZS) control unit)
Function sequence for audio/communication/navigation control messages
The information on audio systems fitted in the vehicle is shown in the multifunction display.
Furthermore navigation information is shown in the multifunction display. The instrument cluster receives the information from the COMAND control unit (A40/3) via the central CAN. In addition the telephone book is displayed via the multifunction display and can be processed accordingly. The COMAND control unit passes on the required information to the instrument cluster via the central CAN.
Additional function requirements for Keyless-Go control/ warning messages (with code (889) Keyless Go)
^ Circuit 15 ON (sent by EIS (EZS) control unit)
Function sequence for Keyless-Go control/warning messages (with code (889) Keyless Go)
If the KEYLESS-GO control unit (N69/5) does not recognize a valid transmitter key (A8/1) or the DIRECT SELECT gear selector switch (S16/13) is not in position "P" or "N" during a starting attempt, a message appears in the multifunction display. The KEYLESS-GO control unit transmits the corresponding information via the interior CAN.
The steering column tube module (N80) transmits the status of the DIRECT SELECT gear selector switch via the chassis CAN. The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.
Function sequence emergency call system indicator/warning messages (with code (494) USA version)
The vehicle-related services are shown in the multifunction display. If the emergency call system control unit (N123/4) establishes a fault on a self-test or if the emergency call system is activated, an appropriate message appears in the multifunction display. The emergency call system control unit transmits the information necessary for this via the diagnostic CAN (CAN D), central gateway control unit and central CAN to the instrument cluster
Additional function requirements for AIRMATIC control/ warning messages
^ Circuit 61 ON
The ME-SFI control unit transmits the status of circuit 61 to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.
Function sequence for control/warning messages for AIRMATIC
If the AIRMATIC with ADS control unit (N51) detects a fault in the AIRMATIC system, it transmits appropriate information to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. The instrument cluster receives this information and issues corresponding messages via the multifunction display. There are various system messages or warning messages with different fault priorities. If several faults exist at the same time, several fault messages will be output accordingly.
Additional function requirements for parking assist control/ warning messages (with code (220) PARKTRONIC or code (230) Exclusive parking assist)
^ Vehicle speed v < 16 km/h (calculated by instrument cluster)
^ No control intervention by the following systems within the past t = 5 s:
- Antilock brake system (ABS)
- ESP
Parking assist control/warning messages function sequence (with code (220) PARKTRONIC or code (230) Exclusive parking assist)
PARKTRONIC (with code (498) Japan version):
PARKTRONIC is displayed by means of a bar graph display in the electronic speedometer and on the rear headliner. In addition an acoustic warning sounds depending on the distance to the obstacle. The PTS control unit (N62) transmits the corresponding requests to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.
The PARKTRONIC function can be manually deactivated or activated using the PTS OFF switch (S6/2s12). The light emitting diode in the PTS OFF switch lights up when the PARKTRONIC function is deactivated.
The status of the PTS OFF switch is read in by the upper control panel control unit via the instrument panel LIN and is passed on to the PTS control unit via the interior CAN, central gateway control unit and chassis CAN. As a result of this the PTS control unit deactivates or activates the PARKTRONIC function.
Parking system (without code (498) Japan version):
Based on the PARKTRONIC function the parking assist system indicates potential longitudinal parking spaces in the multifunction display after it has measured them.
The measurements are made by the outer left front PTS ultrasonic sensor (B8/1) or outer right front PTS ultrasonic sensor (B8/6), located in the side of the front bumper.
The data from the corresponding PTS ultrasonic sensor are read in and evaluated by the PTS control unit.
If the system measures a possible lengthwise (parallel) parking space, a white highlighted "P" symbol appears in the multifunction display. Provided that the longitudinal parking space is defined as suitable, a blue stored "P" symbol with direction arrow appears in the multifunction display. The PTS control unit transmits corresponding information for this to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. Provided that the vehicle has stopped with the usual parking distance to the longitudinal parking space shown and reverse gear is engaged, the multifunction display in the strip speedometer changes and shows the vehicle schematically from a bird's eye view in its position relative to the parking space.
Guide lines and steering instructions are displayed to ensure the driver parks the vehicle optimally. The output of chimes points out the proximity to an obstacle.
The intelligent servo module for DIRECT SELECT (A80) transmits information about the current transmission selector lever position via the drive train CAN (CAN C), ME-SFI [ME] control unit and chassis CAN to the PTS control unit.
The regenerative braking system control unit forwards active ESP/ ABS control intervention functions to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.
Additional function requirements, ATA control/warning message (with code (551) Antitheft alarm system (ATA))
^ Circuit 15 ON (sent by EIS (EZS) control unit)
Function sequence for control/warning messages for antitheft alarm system (with code (551) Anti-theft alarm system (ATA [EDW]))
The rear SAM control unit with fuse and relay module (N10/2) is the master control unit for the anti-theft alarm system. The rear SAM control unit transmits fault messages and information messages to the instrument cluster via the interior CAN, central gateway control unit and central CAN. The instrument cluster receives this data and then issues corresponding messages on the multifunction display.
Function sequence for Night View Assist warning messages (with code (610) Night View Assist)
The Night View Assist control unit (N101) monitors the Night View Assist function. If the Night View Assist control unit detects a fault or malfunction, it sends corresponding information to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.
The instrument cluster receives this data and then issues corresponding messages on the multifunction display.
Additional function requirements, automatic lane recognition (with code (476) Automatic lane recognition)
^ Circuit 15 ON (sent by EIS (EZS) control unit)
^ Function enabled in instrument cluster
^ Radius of curve r >150 m
^ Track width s = 2.2 up to 4.6 m
^ Identifiable lane markings present
^ Vehicle speed v = 60 to 250 km/h (calculated by instrument cluster)
Automatic lane recognition control message function sequence (with code (476) Automatic lane recognition)
The automatic lane recognition function recognizes that the vehicle is leaving the lane and warns the driver so that he can react accordingly.
The traffic space in front of the vehicle is recorded and evaluated by the multifunction camera. As soon as a front wheel (A40/11) touches or drives over the road marking, the multifunction camera issues the request to output the haptic warning. This takes place by actuating the steering wheel vibration motor (M99). The current status of the automatic lane recognition function is shown in the multifunction display.