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GF54.30-P-2001LE Control/warning Messages, Function

General function requirements
^ C. 15R On

The circuit status circuit 15 is transmitted by the EZS control unit (N73) via the chassis CAN (CAN E), central gateway control unit (N93) and central CAN (CAN F) 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 indicator/warning messages:
The visual indicator and warning messages are displayed using the following instrument cluster components:
- Multifunction display (A1p13) (e.g. variable indicator and warning lamps, control/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 and warning lamps in the multifunction display: The variable indicator and warning lamps are displayed in the multifunction display. They can change their position in the multifunction display depending on the request.
The following indicator and warning lamp are variable indicator and warning lamps:
- 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) (on model 216 with code (219) Distronic (DTR) or with code (233) DISTRONIC PLUS)
- Tire pressure monitor warning lamp (A1e66) (with code (475) Tire pressure monitor (Premium))

The messages shown on the multifunction display are split up according to their level of urgency into four categories:
- Category 1 (message with highest priority) Category 1 messages bring attention to safety-endangering conditions and situations and are displayed within a maximum of t = 2 s after they occur. These messages cannot be acknowledged. When they occur, a brief warning is emitted by the buzzer.
- Category 2 (messages with medium priority) Category 2 messages require action from the driver and appear with a temporary delay of max. t = 2 s. These messages also include operator feedback. 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 notifications and simply provide information to the driver (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 overlaid by the new message after a minimum display time has elapsed.

The indicator/warning messages consist of the following subfunctions:
^ Function sequence for cruise control control/warning messages (on model 216 without code (219) Distronic (DTR) or without code (233) DISTRONIC PLUS)
^ Function sequence for Distronic control/warning messages (on model 216 with code (219) Distronic (DTR) or with code (233) DISTRONIC PLUS)
^ Function sequence for Safety-Brake-Control indicator/ warning messages
^ Function sequence for control/warning messages for supplemental restraint system
^ Function sequence for PRE-SAFE warning messages
^ Function sequence for stationary heater (STH) warning messages (with code (228) Stationary heater)
^ Tire pressure loss warning function sequence
^ Function sequence for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium))
^ Function sequence for memory adjustment control messages (on model 216, on model 221 with code (275) Memory package (driver seat, steering column, mirrors))
^ Function sequence for audio/navigation/communication 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 AIRMATIC control/warning messages (on model 221 without code (487) Active Body Control (ABC))
^ Function sequence for Active Body Control (ABC) control/ warning messages (on model 221 with code (487) Active Body Control (ABC), on model 216)
^ Function sequence for parking system control/warning messages (with code (220) PARKTRONIC or on model 221 as of 1.6.09 with code (230) Exclusive parking assist)
^ Function sequence for antitheft alarm system (ATA [EDW]) control/warning messages (with code (551) Antitheft alarm system (ATA [EDW]))
^ Function sequence for Night View Assist warning messages (with code (610) Night View Assist)
^ Function sequence for Attention Assist control/warning messages (on model 221 as of 1.6.09)
^ Function sequence for automatic lane recognition warning messages (on model 221 as of 1.6.09 with code (476) Automatic lane recognition)
^ Function sequence for Speed Limit Assist control/warning messages (on model 221 as of 1.6.09 with code (513) Speed Limit Assist)
^ Function sequence for Adaptive Highbeam Assist control message (on model 221 as of 1.6.09 with code (608) Light package for Avantgarde incl. Intelligent Headlamp Control (ECE))
^ Function sequence for trailer recognition control/warning messages (on model 221 with code (550) Trailer hitch)
^ 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 for speed warning (with code (623) Gulf States version)
^ 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 preglow indicator lamp (with diesel engine)
^ 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)

Additional function requirements for cruise control control/ warning messages (on model 216 without code (219) Distronic (DTR) or without code (233) DISTRONIC PLUS)
^ Vehicle speed v > 30 km/h

The instrument cluster calculates the vehicle speed from the wheel speeds, which the ESP control unit (N47-5) makes available 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. The cruise control is activated using the CC [TPM] 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)
^ Function sequence for permanent limiter display (without code (494) USA version)

Function sequence for cruise control display
If the cruise control is on, the stored speed is shown for t =5 s in the multifunction display and by a triangle in the electronic speedometer (A1p8). The speedometer scale in the electronic speedometer is shown in the form of an open segment ring.

The individual segments symbolize various vehicle speed ranges and can be 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 electronic speedometer lights up between the minimum speed and the set speed limit.
If the cruise control and the variable speed limiter are switched on, the segment ring in the speedometer lights up between the cruise control and the variable speed limiter speed.

Function sequence for permanent limiter display (without code (494) USA version)
The vehicle's maximum speed can be permanently governed on the instrument cluster to a value between 160 km/h (e.g. for winter tire operation) and the maximum speed.
If only the permanent limiter is switched on, the segment ring will not be displayed.
If the permanent limiter is activated in parallel to the variable speed limiter, the segment ring lights up brightly in the electronic speedometer between the set speed limit of the variable speed limiter and the set speed value of the permanent speed limiter. A warning message appears in the multifunction display if the set speed is exceeded. In addition, the instrument cluster 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 for Distronic control/warning messages (on model 216 with code (219) Distronic (DTR) or with code (233) DISTRONIC PLUS)
^ Vehicle speed v > 30 km/h (calculated by instrument cluster)

Function sequence for Distronic control/warning messages
Distronic controls the speed of the vehicle in such a way as to maintain a minimum distance from the vehicle ahead. The Distronic is activated by pressing the TPM 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 electronic speedometer lights up brightly between the speed of the vehicle in front and the stored speed. In addition, a tracking graphic appears in the multifunction display.

In this tracking graphic one's own vehicle is shown on the right edge of the picture as well as the vehicle driving in front on the left edge of the picture (if recognized).
The following information is also 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 falls short of the safe following distance to the vehicle ahead, the DTR controller unit (A89) transmits a corresponding signal via the vehicle dynamics CAN (CAN H) to the radar sensors control unit (SGR) (N62/1).
The radar sensors control unit relays this signal via the chassis CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives the signal and actuates the DTR warning lamp.

Additional function requirements for Safety Brake Control indicator/warning messages
^ Circuit 15 On (provided by EIS [EZS] control unit)

Function sequence for Safety Brake Control indicator/warning messages
If the Electronic Stability Program (ESP) is switched to passive mode or in the event of an ESP control intervention, the instrument cluster actuates the ESP warning lamp If the ESP control unit detects an ESP malfunction, 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 this on the interior CAN (CAN B). The ESP control unit places fault messages on the chassis CAN. The central gateway control unit relays all relevant information via the central CAN to the instrument cluster.

Additional function requirements for supplemental restraint system control/warning messages
^ Circuit 15 On (provided 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 and actuates the airbag indicator and warning lamp (A1e15) and issues corresponding messages on the multifunction display.

Additional function requirements, PRE-SAFE warning messages
^ Circuit 15 On (provided by EZS control unit)

Function sequence for PRE-SAFE warning messages
If there is a fault in the PRE-SAFE system, the left front reversible emergency tensioning retractor (A76) or the right front reversible emergency tensioning retractor (A76/1) transmits 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 supplemental restraint system indicator lamp and outputs corresponding messages via the multifunction display.

STH warning message, function sequence (with code (228) Stationary heater)
The function of the STH is monitored by the STH control unit (A6n1) (model 216) or by STH or ZUH control unit (A6n1) (model 221).
If the STH control unit identifies a fault or a malfunction in the STH, it transmits a corresponding signal via the interior CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives the signal and issues a corresponding message via the multifunction display.

Additional function requirements for tire pressure loss warning
^ Vehicle speed v > 0 km/h (calculated by instrument cluster)

Tire pressure loss warning function sequence
A pressure loss at one of the tires is recognized by the change in wheel circumference and the associated change in wheel speed. the ESP control unit identifies pressure loss on a tire, it transmits a corresponding signal via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.
The instrument cluster receives this signal and issues a corresponding message via the multifunction display.

Additional function requirements for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium))
^ Circuit 15 On (provided by EIS [EZS] control unit)

Function sequence for tire pressure monitor warning messages
If the RDK control unit (N88) identifies a pressure loss on a tire, it transmits a corresponding signal
- up to 31.5.09 on the interior CAN or
- as of 1.6.09 to the chassis CAN.

The central gateway control unit relays the signal via the central CAN to the instrument cluster.
The instrument cluster receives this information, actuates the tire pressure monitor warning lamp and issues corresponding messages on the multifunction display.

Function sequence for memory adjustment control messages (on model 216, on model 221 with code (275) Memory package (driver seat, steering column, mirrors))
When saving a memory position, the left front seat control unit (N32/1) or the right front seat control unit (N32/2) transmits a request to output an acknowledgment tone via the interior CAN, central gateway control unit and central CAN to the instrument cluster.
The instrument cluster receives this request and issues the acknowledgment tone.

Additional function requirements for audio/communication/ navigation control messages
^ Circuit 15 On (provided by EIS [EZS] control unit)

Function sequence for audio/communication/navigation control messages
The multifunction display shows the information from the audio systems installed in the vehicle. The navigation directions continue to be shown in the multifunction display. The instrument cluster receives the information from the COMAND controller unit (A40/3) via the central CAN. In addition, the telephone book is displayed on the multifunction display and can be edited accordingly. The COMAND controller unit relays the required information via the central CAN to the instrument cluster.

Additional function requirements for Keyless-Go control/ warning messages (with code (889) Keyless Go)
^ Circuit 15 On (provided by EIS [EZS] control unit)

Function sequence for Keyless-Go control/warning messages
If, when attempting to start, the KEYLESS-GO control unit (N69/5) fails to identify a valid transmitter key (A8/1) or the DIRECT SELECT gear selector switch (S16/13) is not in "P" or "N" position, 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 relays all relevant information via the central CAN to the instrument cluster.

Function sequence emergency call system indicator/warning messages (with code (359) TELE AID emergency call system)
The vehicle-related services are shown in the multifunction display. If, during a self-test, the emergency call system control unit (N123/4) detects a fault or if the emergency call system is activated, a corresponding message is shown 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 (on model 221 without code (487) Active Body Control (ABC))
^ Circuit 61 ON

The status of circuit 61 is transmitted by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

Function sequence for control/warning messages for AIRmatic
If the AIRMATIC with ADS control unit (N51) identifies a fault in the AIRMATIC system, it sends corresponding information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives this data and then issues corresponding messages on 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 Active Body Control (ABC) indicator/warning messages (on model 221 with code (487) Active Body Control (ABC), on model 216)
^ Circuit 61 On (provided by CDI control unit or ME-SFI [ME] control unit)

Function sequence for ABC control/warning messages
The ABC system offers the driver different vehicle level settings. The set vehicle level is shown in the multifunction display. Setting is performed via the level control switch (S6/2s10). In addition, the suspension tuning can be changed using the transmission mode button (A40/9s8). The corresponding selection is shown in the multifunction display as well. The upper control panel control unit reads in the status of the level control switch and the status of the transmission mode button via the instrument panel LIN and transmits this on the interior CAN.
System and warning messages with operating instructions for the driver are also shown on the multifunction display. For that purpose, the ABC control unit (N51/2) transmits corresponding information on the chassis CAN.
The central gateway control unit passes these on to the instrument cluster via the central CAN.

Additional function requirements for parking system control/ warning messages (with code (220) PARKTRONIC or on model 221 as of 1.6.09 with code (230) Exclusive parking assist)
^ Vehicle speed v > 16 km/h (calculated by instrument cluster)
^ No trailer operation (with code (550) trailer hitch)
^ No control intervention by the following systems within the past t = 5 s:
- Antilock brake system (ABS)
- ESP

The "trailer identified" status is transmitted by the trailer recognition control unit (N28/1) on the interior CAN. The ESP control unit transmits active ABS/ESP control interventions via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

Function sequence for parking system control/warning messages
PARKTRONIC:
The PARKTRONIC information is displayed via a bar graph in the electronic speedometer and on the headliner in the rear. In addition, a warning tone will sound depending on the distance to the obstacle.
The PTS control unit (N62) transmits the corresponding requests
- up to 31.5.09 on the interior CAN or
- as of 1.6.09 on the chassis CAN.

The central gateway control unit passes these on to the instrument cluster via the 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 PTS OFF switch status is read in by the upper control panel control unit via the instrument panel LIN and relayed via the interior CAN, central gateway control unit and chassis CAN to the PTS control unit. The PTS control unit subsequently deactivates or activates the PARKTRONIC function.

Parking system (model 221 as of 1.6.09):
Based on the PARKTRONIC function, the parking assist system points out possible lengthwise (parallel) parking spaces in the multifunction display after it has measured them. The measurement is carried out by the outer front left ultrasonic sensor (B8/1) or the outer front right PTS ultrasonic sensor (B8/6), which are located on the side of the front bumper. The PTS control unit reads in and evaluates the data from the corresponding PTS ultrasonic sensor.

If the system measures a possible lengthwise (parallel) parking space, a white highlighted "P" symbol appears in the multifunction display. If the lengthwise (parallel) parking space is deemed suitable, a blue highlighted "P" symbol appears with a directional arrow in the multifunction display.

For this purpose, the PTS control unit transmits corresponding information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.
If the vehicle is stopped at an acceptable parking distance from the lengthwise (parallel) parking space shown on the display and reverse gear is engaged, the multifunction display switches to the strip speedometer and shows the position of the vehicle relative to the parking space schematically from a bird's eye view.
Guide lines and steering instructions are displayed to ensure the driver parks the vehicle optimally. Chimes are output to indicate that the vehicle is approaching 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.

Additional function requirements for ATA control/warning messages (with code (551) Antitheft alarm system (ATA))
^ Circuit 15 On (provided by EIS [EZS] control unit)

Function sequence for control/warning messages for antitheft alarm system
The rear SAM control unit with fuse and relay module (N10/2) is the master control unit for the ATA. The rear SAM control unit transmits error and information messages via the interior CAN, central gateway control unit and central CAN to the instrument cluster. 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 identifies an error or a malfunction, it sends corresponding information
- up to 31.5.09 via the vehicle dynamics CAN, ESP control unit, chassis CAN, central gateway control unit and central CAN to the instrument cluster.
- as of 1.6.09 via chassis CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster receives this data and then issues corresponding messages on the multifunction display.