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Control/warning messages, function - GF54.30-P-2001CE

MODEL 204.0/2 as of model year 2009 

/YoM 08 

MODEL 204.3 

MODEL 204.9 

Function requirements, general 

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:

Visual control/warning messages:

The visual indicator and warning messages are displayed using the following instrument cluster components:

Audible control/warning messages:

The acoustic indicator and warning messages are issued using the following instrument cluster components:

The messages shown on the travel distance display or the multifunction display are shown for a period of t = 5 s, and assigned according to their urgency into two categories:

Messages in category 1 indicate hazardous conditions or situations and they have priority over messages with lower priority.

These messages are automatically stored in the message memory and cannot be confirmed.

For certain category 1 messages a warning message highlighted in red is also issued.

Messages in category 2 can be acknowledged (confirmed). After this the messages are then stored in the message memory.

The messages can all be displayed in the Service menu. The control/warning messages function includes the following subfunctions:

Additional function requirements for ESP indicator/warning messages 

Function sequence for ESP indicator/warning messages 

If the ESP is switched to passive when the engine is running, the Electronic Stability Program control unit (N30/4) sends corresponding information over the chassis CAN to the instrument cluster. The instrument cluster receives it and actuates the Electronic Stability Program warning lamp (A1e41) permanently.

With model 204 except model 204.077/277/375 the ESP is switched passive as follows:

The front SAM control unit with fuse and relay module (N10/1) reads in the status of the ESP button over the instrument panel LIN (LIN 1) and sends it over the chassis CAN to the Electronic Stability Program control unit.

It is possible to scroll between the respective menus and submenus via the scroll forward and back button of the (S110s1) left multifunction steering wheel button group (S110). Selection is then made by pressing the OK n/(S110s6).

The request is read in by the steering wheel electronics (N135) and sent over the steering LIN (LIN E1) to the steering column tube module control unit (N80). The steering column tube module control unit routes the request over the chassis CAN to the instrument cluster.

If, when the engine is running, on model 204.077/277/375 the ESP is switched passive by pressing the ESP button (up to 31.5.10) or via the "Assist." menu in the instrument cluster (as of 1.6.10) or the system changes over to "Sport mode", the Electronic Stability Program control unit transmits corresponding information via the chassis CAN to the instrument cluster. The instrument cluster receives this and actuates the Electronic Stability Program warning lamp continuously. In addition the message "ESP-OFF" or "ESP-SPORT" (up to 31.5.10) or "Sport Handling mode" (as of 1.6.10) appears in the multifunction display.

If the Electronic Stability Program control unit detects any faults or malfunctions in the ESP, it sends the corresponding information in the same manner. The instrument cluster receives these, actuates the ESP OFF indicator lamp (A1e30) and issues corresponding messages via the multifunction display.

IMPORTANT The mode change from "ESP-SPORT" (up to 31.5.10) or "Sport Handling Mode" (as of 1.6.10) or "ESP-OFF" into "ESP-ON" is displayed by the message "ESP-ON" in the multifunction display for t = 3 s.

Additional function requirements for ABS indicator/warning messages 

(calculated by instrument cluster)

Function sequence for ABS indicator/warning messages 

If the Electronic Stability Program control unit detects a malfunction in the ABS, it forwards corresponding data over the chassis-CAN to the instrument cluster. The instrument cluster receives it, actuates the antilock brake system indicator lamp (A1e17) and sends corresponding messages over the travel distance display or the multifunction display.

Additional function requirements for supplemental restraint system control/warning messages 

IMPORTANT The circuit 15 status is sent by the electronic ignition lock control unit (N73) over the chassis CAN and interior CAN (CAN B).

Function sequence for control/warning messages for supplemental restraint system 

If there is a fault in the supplemental restraint system, the supplemental restraint system control unit (N2/10) sends corresponding data via the chassis CAN to the instrument cluster. The instrument cluster receives this information and actuates the supplemental restraint system indicator lamp (A1e15).

Corresponding messages are also shown on the travel distance display or the multifunction display.

Additional function requirements for PRE-SAFE control/warning messages 

Function sequence for control/warning messages for PRE-SAFE 

If the left front reversible emergency tensioning retractor (A76) or the right front reversible emergency tensioning retractor (A76/1) detects errors in the PRE-SAFE system, they forward corresponding information over the chassis-CAN to the instrument cluster. The instrument cluster receives the information, actuates the supplemental restraint system indicator lamp and sends corresponding messages over the travel distance display or the multifunction display.

Additional function requirements, national seat belt reminder warning 

(with code (498) Japan version)

(calculated by instrument cluster)

National seat belt reminder warning function sequence 

To display the country-specific seat belt reminder warning, the supplemental restraint system control unit evaluates the signals for the following components:

The supplemental restraint system control unit sends the corresponding signals over the chassis CAN to the instrument cluster. The instrument cluster receives the signals, actuates the seat belt warning lamp (A1e9) accordingly and also issues an acoustic warning "chime".

As from a speed of v > 0 km/h the following acoustic warning phases are initiated:

A loud acoustic warning is issued for maximum t = 93 s at an interval of t = 0.5 s.

The seat belt reminder warning is deactivated, when the seat belt is inserted or, when the vehicle is at a standstill, the driver or front passenger door is opened.

The seat belt reminder warning is activated again under the following circumstances:

The rear seat belt reminder warning is realized through monitoring the number of inserted seat belt buckles in the rear.

If this number changes, a visual and an acoustic warning are issued.

To this end, the rear SAM control unit with fuse and relay module (N10/2) sends the signals from the following components over the interior CAN:

If the seat belt reminder warning was activated while the vehicle was moving, the visual warning will continue to be displayed for another t = 30 s after the vehicle has come to a standstill. This is contingent on a change in the status of the left or right rear door while the vehicle is at a standstill. The status of the rear doors is sent by the rear SAM control unit over the interior CAN.

Additional function requirements for tire pressure loss warning (with code 477) Tire pressure loss warning) 

(calculated by instrument cluster)

Function sequence for tire pressure loss warning (with code 477) Tire pressure loss warning) 

A pressure loss at one of the tires is recognized by the change in wheel circumference and the associated change in wheel speed.

If the Electronic Stability Program control unit detects a pressure loss on one of the tires, it forwards corresponding data via the chassis-CAN to the instrument cluster.

The instrument cluster reads in this information and shows a "Check tire pressure" message on the travel distance display or the multifunction display.

Additional function requirements for warning messages for tire pressure monitor (with code (470) Tire pressure monitor (base) or with code (475) Tire pressure monitor (Premium)) 

Function sequence for warning messages for tire pressure monitor 

(with code (470) Tire pressure monitor (base) or with code (475) Tire pressure monitor (Premium)) 

If the tire pressure monitor control unit (N88) detects a pressure loss in a tire or system faults, it transmits corresponding information via the interior CAN (up to 31.5.09) or via chassis CAN (as of 1.6.09) to the instrument cluster. The instrument cluster receives the signals and actuates the tire pressure monitor warning lamp (A1e66).

In addition after switching off circuit 15 the message "Correct the Tire Pressure" appears in the display of travel distance or in the multifunction display.

Function sequence for emergency call system control/warning messages 

(with code (359) TELE AID emergency call system) 

The vehicle-related services are shown on the Audio/COMAND display (A40/8) and the instrument cluster. 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 travel distance display or in the multifunction display. The required information is sent by the emergency call system control unit over the diagnostic CAN (CAN-D). The front SAM control unit passes this onto the instrument cluster via the body CAN.

Function sequence for ATA control/warning messages (with code (551) Antitheft alarm system (ATA)) 

The master control unit for the antitheft alarm system is the rear SAM control unit.

To display specific messages the rear SAM control unit sends corresponding information over the interior CAN to the instrument cluster. The instrument cluster then shows it on the travel distance display or the multifunction display.

Additional function requirements for control messages for wiper system (on model 204.2/9) 

Function sequence for wiper system control messages (for model 204.2/9) 

The active rear wiper interval function is shown as a symbol on the travel distance display or on the multifunction display.

The front SAM control unit sends the "rear wiper interval active" status" over the interior CAN to the instrument cluster.

Additional function requirements for control/warning messages for Keyless Go (with code (889) Keyless Go) 

Function sequence for Keyless-Go control/warning messages (with code (889) Keyless Go) 

If, during a start attempt, the KEYLESS-GO control unit (N69/5) does not detect a valid transmitter key (A8/1) or if the electronic selector lever module control unit (N15/5) (for transmission 722) does not send the "selector lever position P or N" status, a chime is sounded and a corresponding message is shown on the travel distance display or in the multifunction display. The relevant information for this is sent by the KEYLESS-GO control unit over the interior CAN to the instrument cluster.

Function sequence for memory adjustment control messages (with code (275) Memory package (driver seat, steering column, mirrors)) 

The instrument cluster outputs an acknowledgment tone when a memory position is stored. To this end, the driver seat control unit (N32/1) or the front passenger seat control unit (N32/2) sends a corresponding request over the interior CAN to the instrument cluster.

Additional function requirements for indicator/warning messages for support systems 

Function sequence for indicator/warning messages of support systems 

The assist system warning messages function is made up of the following component functions:

D Function sequence for attention assistance system display (model 204.0/2 as of 1.3.11 with code (442) Comfort multifunction steering wheel, model 204.3 with code (442) Comfort multifunction steering wheel) 

D Function sequence for automatic lane recognition display (with code (476) Automatic lane recognition) 

D Function sequence for displaying Active Lane Keeping Assist 

(with code (238) Active Lane Keeping Assist) 

D Function sequence for Speed Limit Assist display 

(with code (513) Speed Limit Assist) 

D Function sequence for Blind Spot Assist warning messages 

(with code (234) Blind Spot Assist) 

D Function sequence for Active Blind Spot Assist warning messages (with code (237) Active Blind Spot Assist) 

Function sequence for attention assistance system display (model 204.0/2 as of 1.3.11 with code (442) Comfort multifunction steering wheel, model 204.3 with code (442) Comfort multifunction steering wheel) 

By means of evaluating the handling characteristics attention assist monitors the activities of the driver and recognized tiredness occurring or increasing inattentiveness (e.g. on long monotonous trips on freeways and highways).

The driver's individual driving parameters and a warning threshold are determined in the first t = 20 minutes of driving.

If driver fatigue or increasing inattention is recognized, the Electronic Stability Program control unit sends a warning message request through the chassis CAN to the instrument cluster.

The instrument cluster receives this information and then issues a corresponding message over on the multifunction display and actuates the warning buzzer.

Additional function requirements for control/warning messages for CC (with code (440) CC (cruise control)) 

IMPORTANT The instrument cluster calculates the vehicle speed using the wheel speeds that are sent by the Electronic Stability Program control unit over the chassis CAN. The CDI control unit or the ME-SFI [ME] control unit transmits the status of circuit 61 via chassis CAN.

Function sequence for cruise-control control/warning messages 

(with code (440) Cruise control) 

The cruise control then regulates the vehicle speed to an adjustable value. The cruise control is activated using the cruise control lever (S40/4). The cruise-control control/warning messages consist of the following subfunctions:

Function sequence for cruise control display 

If the cruise control is switched on, the stored speed is shown on vehicles without code (442) Comfort multifunction steering wheel in the travel distance display. On vehicles with code (442) Comfort multifunction steering wheel, the dial scale on the speedometer (A1p8) is shown as a segment ring. The individual segments symbolize various vehicle speed ranges.

The segment ring lights up between the set speed and the maximum speed.

Function sequence for variable speed limiter display 

The variable speed limiter governs the vehicle speed to a configurable value that lies between v = 30 km/h and the maximum speed.

When the variable speed limiter is switched on, the adjusted speed on vehicles without code (442) Comfort multifunction steering wheel except model 204.077/277 is displayed in the travel distance display.

On vehicles with code (442) Comfort multifunction steering wheel or on model 204.077/277 the segment ring in the speedometer lights up brightly between the minimum speed and the legal speed limit.

Function sequence for permanent limiter display 

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. If the set speed is dropped below, a warning message is shown in the travel distance display or in the multifunction display.

The permanent limiter can only be switched on and off in the corresponding menu in the instrument cluster.

IMPORTANT If the Electronic Stability Program control unit detects system malfunctions or faults, it forwards corresponding data over the chassis-CAN to the instrument cluster.

The instrument cluster receives this information and shows corresponding messages on the travel distance display or the multifunction display.

Additional function requirements for parking assist control messages (with code (220) PARKTRONIC or code (230) Exclusive parking assist) 

Function sequence for parking system control message (with code (220) PARKTRONIC or code (230) Exclusive parking assist) 

The parking system uses an ultrasonic measuring system to record the distance from the vehicle to an obstacle, the so-called PARKTRONIC (with code (220) PARKTRONIC).

On vehicles with code (230) Exclusive parking assist, then when driving at speeds of v < 36 km/h, additional longitudinal parking spaces on both sides of the vehicle are measured in the direction of travel. If the parking system records a parking space and the parking procedure is to be conducted, corresponding steering and driving instructions are issued through the multifunction display in instrument cluster.

The exclusive parking assist system builds on the functionality of the PARKTRONIC, but has expanded detection areas. The distance between the vehicle and the obstacle is indicated to the driver visually and acoustically. To this end, the parking system control unit (N62) on vehicles with code (220) PARKTRONIC sends corresponding information over the interior CAN or on vehicles with code (230) Exclusive parking assist over the chassis CAN to the instrument cluster.

Additional function requirements, Distronic control/warning messages (with code (233) DISTRONIC PLUS) 

Distronic indicator/warning messages function sequence (with code (233) DISTRONIC PLUS) 

The Distronic controls the speed of the vehicle in such a way to maintain a minimum distance from the vehicle ahead. If the Distronic is activated, the stored speed is marked by lighting up of one or two segments in the stored speed area.

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 pursuit diagram is shown in the multifunction display. In this, the one's own vehicle is shown on the right and the vehicle ahead on the left of the image border.

In addition the following information is displayed:

If the vehicle falls short of the safe following distance to the vehicle ahead, the electric DISTRONIC controller unit (A89) sends a corresponding signal via the vehicle dynamics CAN (CAN H) to the video and radar sensor system control unit (N62/2).

The video and radar sensors control unit routes this signal over the chassis CAN to the instrument cluster. The instrument cluster receives this signal, actuates the DISTRONIC warning lamp (A1e59) and the warning buzzer.

Function sequence for automatic lane recognition display (with code (476) Automatic lane recognition) 

The automatic lane recognition recognizes when lane marking is driven over and warns the driver in certain situations before the lane is exited.

The multifunction display shows the status and warning readiness of the automatic lane recognition. The multifunction camera (A40/11) sends corresponding information over the chassis CAN to the instrument cluster for this purpose. The instrument cluster receives this data and then issues corresponding messages on the multifunction display.

Function sequence for displaying Active Lane Keeping Assist (with code (238) Active Lane Keeping Assist) 

The Active Lane Keeping Assist detects when lane markings are crossed over and warns the driver in certain situations by means of a warning system in the steering wheel when the lane is exited. If the warning proves ineffective, intervention by the brake system is authorized to move the vehicle back into the calculated driving lane.

To this end, the multifunction camera sends corresponding information over the chassis CAN to the video and radar sensor system control unit and forwards it to the instrument cluster. In the instrument cluster the current status and the warning readiness are constantly displayed on the multifunction display.

Function sequence for Speed Limit Assist display (with code (513) Speed Limit Assist) 

The Speed Limit Assist records speed limits shown for the stretch driven on by the vehicle.

These are shown on the multifunction display in the form of a traffic sign. The multifunction camera sends corresponding information over the chassis CAN to the instrument cluster for this purpose.

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

Function sequence for Blind Spot Assist warning messages (with code (234) Blind Spot Assist) 

If an intended change of lane is detected (turn signal operation) and the left rear bumper intelligent radar sensor (B29/4) or the right rear bumper intelligent radar sensor (B29/5) at the same times detects another vehicle level with its own vehicle, the right rear bumper intelligent radar sensor sends corresponding information over the chassis CAN to the instrument cluster. The instrument cluster then receives this and actuates the warning buzzer.

Function sequence for Active Blind Spot Assist warning messages (with code (237) Active Blind Spot Assist) 

The Active Blind Spot Assist is based on the functionality of the Blind Spot Assist. Active Blind Spot Assist can additionally perform brake system interventions taking the surroundings of the vehicle with the system into account.

Active interventions by the brake system are conducted on a wheel-specific basis and exert a corrective influence on the vehicle with the system.

The video and radar sensor system control unit sends corresponding information over the chassis CAN to the instrument cluster.

The instrument cluster then receives this and actuates the warning buzzer.

Additional function requirements for stationary heater control/warning messages function sequence (with code (228) Stationary heater) 

Function sequence for stationary heater control/warning messages 

(with code (228) Stationary heater) 

The "Stationary heater" menu enables the stationary heater function (e.g. starting time/lead time) to be programmed over the left multi function steering wheel button group. The instrument cluster wakes up the interior CAN t = 60 minutes before the lead time starts and then actuates the stationary heater unit (A6) at the designated time. If the stationary heater control unit (A6n1) detects a defect, then a corresponding signal is sent over the interior CAN to the instrument cluster. A corresponding fault message is also shown on the travel distance display or the multifunction display.

Additional function requirements for audio/communication/navigation control messages 

(with code (510) Audio 20 incl. CD-changer or 

code (523) MB Audio 20 radio or 

code (511) Audio 50 APS incl. DVD changer or 

code (525) MB Audio 50 APS radio or 

code (512) COMAND APS incl. DVD changer or 

code (527) COMAND APS with single DVD drive (with navigation)) 

Function sequence for audio/communication/navigation control messages 

(with code (510) Audio 20 incl. CD-changer or 

code (523) MB Audio 20 radio or 

code (511) Audio 50 APS incl. DVD changer or 

code (525) MB Audio 50 APS radio or 

code (512) COMAND APS incl. DVD changer or 

code (527) COMAND APS with single DVD drive (with navigation)) 

Information on the audio systems installed in the vehicle is shown on the travel distance display or the multifunction display.

Depending on the equipment specification, additional navigation information or communication-relevant information (e.g. network provider, telephone book entries) is shown on the travel distance display or the multifunction display. The instrument cluster receives all relevant information from the installed audio components over the interior CAN.

Additional function requirements for control/warning messages for AHE (with code (550) AHV [trailer hitch]) 

Function sequence for trailer recognition control/warning messages (with code (550) Trailer hitch) 

The trailer recognition control unit (N28/1) monitors the status of the trailer.

If the ball neck is not locked, the trailer recognition control unit sends a corresponding signal over the interior CAN to the instrument cluster. The instrument cluster receives this signal and shows a corresponding message on the travel distance display or the multifunction display.

Additional function requirements for ABL control/warning messages 

Function sequence for ABL indicator/warning messages 

Visual feedback of switched on low beams is provided by the low beams indicator lamp (A1e67).

Visual feedback of activated high beams is provided by the high beams indicator lamp (A1e3).

The front SAM control unit sends the high beam and low beam status over the interior CAN to the instrument cluster. The function of the exterior lights (ABL) components is permanently monitored.

If a fault is detected on a component, the monitoring control unit sends corresponding information over the interior CAN to the instrument cluster. The instrument cluster receives this information and shows corresponding messages on the travel distance display or the multifunction display.

The function of the components in the exterior lights is monitored by the following control units:

The xenon light control unit or the headlamp control unit monitors the functions of the actuated components. If a xenon light control unit or the headlamp control unit detects a fault or a failure of the relevant component, it sends corresponding information over the front end-CAN (CAN G). The front SAM control unit routes this via the chassis-CAN to the instrument cluster. The instrument cluster receives this information and shows corresponding messages on the travel distance display or the multifunction display.

Additional function requirements for lights on reminder 

Lights on reminder function sequence 

If with circuit 15C OFF and a switched-on standing light the driver door is opened, the instrument cluster actuates the warning buzzer and emits a corresponding message via the travel distance display or multifunction display.

The front SAM control unit sends the "standing lights ON" status and the left front door control unit sends the "driver door opened" status over the interior CAN to the instrument cluster.

If, with an active rear fog lamp actuation, the transmitter key is removed from the electronic ignition lock control unit, and the driver door is opened, the instrument cluster actuates the warning buzzer and shows a "Switch off light" message on the travel distance display or the multifunction display.

Additional function requirements for door open reminder warning 

(calculated by instrument cluster)

Function sequence, door open reminder warning 

If, at a speed of v > 3 km/h, an open door or an open trunk lid (model 204.0/3) or an open liftgate (model 204.2/9) is detected, the instrument cluster issues an acoustic warning through the warning buzzer.

A corresponding message is also shown on the travel distance display or in the multifunction display.

The status of the doors, trunk lid or liftgate is sent by the following control units over the interior CAN:

Additional function requirements for parking brake on reminder warning 

(calculated by instrument cluster)

Parking brake warning function sequence 

The status of the parking brake is monitored by the parking brake indicator switch (S12).

If the parking brake indicator switch is actuated at a speed of v > 5 km/h, the instrument cluster actuates the brake system warning lamp (A1e51) and displays a corresponding message on the travel distance display or the multifunction display. The status of the parking brake indicator switch is read by the front SAM control unit and sent over the interior CAN to the instrument cluster.

Additional function requirements for speed warning (with code (623) Gulf States version) 

(calculated by instrument cluster)

Function sequence for speed warning 

(with code (623) Gulf States version) 

At speeds of v > 120 km/h the instrument cluster issues a warning tone and shows a corresponding message on the travel distance display or the multifunction display.

The instrument cluster calculates the vehicle speed using the wheel speeds that are sent by the Electronic Stability Program control unit over the chassis CAN. The acoustic warning is disabled at speeds of v < 117 km/h.

Additional function requirements for warning message for rear seatback locking (on model 204.2/9) 

Function sequence for rear seat backrest lock warning message 

(for model 204.2/9) 

The rear SAM control unit monitors the locking of the rear seat backrests. If the rear SAM control unit detects a rear seat backrest that is not locked, it sends corresponding information over the interior CAN to instrument cluster.

The instrument cluster receives this information, issues an acoustic warning and shows a corresponding message on the travel distance display or the multifunction display.

Additional function requirements for engine oil level warning message 

Function sequence for engine oil level warning message 

To monitor the engine oil level, the oil level check switch (S43) installed in the engine oil pan is read in by the CDI control unit or the ME-SFI [ME] control unit and evaluated. If necessary, the CDI control unit or the ME-SFI [ME] control unit sends a corresponding signal via the chassis CAN to the instrument cluster. The instrument cluster receives this signal and shows a corresponding message on the travel distance display or the multifunction display.

Additional function requirements for preglow control (on diesel engines) 

Function sequence for preglow indicator lamp (with diesel engines) 

Preglowing is controlled by the CDI control unit. For the period of time in which the preglowing is active, the CDI control unit sends a corresponding signal via the chassis CAN to the instrument cluster. The instrument cluster receives this signal and actuates the preglow indicator lamp (A1e16).

Additional function requirements for brake wear indicator warning message 

Function sequence for brake wear indicator warning message 

When the wear limit for the brake pads on the front axle is reached, it is detected by the right front brake wear sensor (S10/2). When the wear limit for the brake pads on the rear axle is reached, it is detected by the right rear brake wear sensor (S10/4). Once the wear limit for the brake pad is reached, the vehicle ground (circuit 31) is sent over the brake pad wear sensors to the front SAM control unit. The front SAM control unit then sends a corresponding signal over the interior CAN to the instrument cluster.

The instrument cluster receives this signal and shows a corresponding message on the travel distance display or the multifunction display.

Additional function requirements for brake fluid level warning message 

Function sequence for brake fluid level warning message 

If the fluid level in the brake fluid reservoir is too low it is detected by the brake fluid level switch (S11).

The status of the brake fluid level switch is read in by the front SAM control unit. If the fluid level is too low the front SAM control unit sends a corresponding signal over the interior CAN to the instrument cluster. The instrument cluster receives this signal and shows a corresponding message on the travel distance display or the multifunction display.

Additional function requirements for coolant and coolant temperature warning messages 

Function sequence for coolant and coolant temperature warning messages 

The coolant level in the expansion reservoir is monitored by the coolant level switch (S41). The status of the coolant level switch is read in by the front SAM control unit.

If the coolant level is too low the front SAM control unit sends a corresponding signal over the interior CAN to the instrument cluster. The instrument cluster receives this signal and shows a corresponding message on the travel distance display or the multifunction display. The coolant temperature is recorded by the coolant temperature sensor (B11/4). The CDI control unit or ME-SFI [ME] control unit imports the signal of the coolant temperature sensor, uses it to calculate the coolant temperature and then sends the corresponding temperature value via the chassis CAN to the instrument cluster.

At a coolant temperature of T > 130°C the instrument cluster issues a warning tone and shows a corresponding message on the travel distance display or the multifunction display.

Additional function requirements for windshield washer system fluid level warning message 

Function sequence for windshield washer system fluid level warning message 

The fluid level in the washer fluid reservoir is monitored by the windshield washer system fluid level switch (S42). The status of the windshield washer system fluid level switch is read in by the front SAM control unit. If the fluid level is too low the front SAM control unit sends a corresponding signal over the interior CAN to the instrument cluster. The instrument cluster receives this signal and shows a corresponding message on the travel distance display or the multifunction display.

Turn signal confirmation function sequence 

Acoustic feedback about the active turn signal light actuation is realized by the acoustic turn signal indicator integrated into the instrument cluster.

Visual feedback is provided by the left turn signal light indicator lamp (A1e1) or the right turn signal light indicator lamp (A1e2).

Additional function requirements for on-board electrical system management 

Function sequence for indicator/warning messages for the on-board electrical system management 

The rear SAM control unit monitors the on-board electrical system voltage and therefore the power supply of all consumers. If the on-board electrical system voltage is found to be too low (undervoltage), the rear SAM control unit sends corresponding information over the interior CAN to the instrument cluster.

If individual consumers have already been deactivated because of undervoltage, this is shown on the instrument cluster on the travel distance display or the multifunction display.

The following messages are issued to match the situation:

Additional function requirements for warning message for open tank cap (with code (460) Canada version or code (494) USA version or code (835) South Korea version) 

(calculated by instrument cluster)

Function sequence for open tank cap warning message (with code (460) Canada version or code (494) USA version or code (835) South Korea version) 

The CDI control unit or the ME-SFI [ME] control unit monitors the status of the tank cap.

If, after starting a journey, an open tank cap is detected, the CDI control unit or the ME-SFI [ME] control unit issues a corresponding signal over the chassis CAN to the instrument cluster. The instrument cluster receives this signal, actuates the fuel reserve warning lamp (A1e4) so it blinks at a frequency of f = 2.5 Hz and shows a "tank cap open" message on the travel distance display or the multifunction display.

Additional function requirements for warning message for fuel level sensor 

(with code (494) USA version) 

(calculated by instrument cluster)

Function sequence for fuel level sensor warning message (with code (494) USA version) 

A firmly attached fuel level sensor is detected by comparing any change in the fill level of the fuel tank with the calculated composite mileage.

If a disproportionately high fuel consumption level is determined, the instrument cluster shows a corresponding message on the travel distance display or the multifunction display.

The information required to detect a firmly attached fuel level sensor is sent by the rear SAM control unit, values of the left fuel level indicator sensor (B4/1) and the right fuel level indicator sensor (B4/2), over the interior CAN to the instrument cluster.

Information on the fuel consumption is sent by the CDI control unit or the ME-SFI [ME] control unit over the chassis CAN to the instrument cluster.

Additional function requirements for engine-control control/warning messages 

Function sequence for engine-control control/warning messages 

If there is a fault in the diesel fuel injection system, in the ignition system or in the exhaust system, the CDI control unit or the ME-SFI [ME] control unit sends corresponding information over the chassis CAN to the instrument cluster. The instrument cluster receives the signals and actuates the engine diagnosis indicator lamp (A1e58).

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic of instrument cluster, control/warning message   PE54.30-P-2054-97FAB
  Overview of system components, instrument cluster (IC) component description   GF54.30-P-9996CE
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