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control/warning messages, function - GF54.30-P-2001LE

MODEL 216.3, 221.0 /1 as of model year 2009 

/YoM 08 

Function requirements, general 

IMPORTANT The EZS control unit (N73) sends the status of circuit 15 to the instrument cluster (A1) via the chassis CAN (CAN E), central gateway control unit (N93) and central CAN (CAN F).

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:

Variable indicator lamps and warning lamps in 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:

The messages inserted in the multifunction display are subdivided into four categories corresponding to their urgency:

These messages are menu displays and only serve as driver information (e.g. low washer fluid level). There is no acoustic warning.

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 control/warning messages consist of the following subfunctions:

Function sequence for hybrid readiness indicator (on model 221.095/195) 

When the ignition is switched on, the ME-SFI [ME] control unit (N3/10) and the battery management system control unit (N82/2) check whether the hybrid drive is ready for operation.

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 for regenerative braking system control/warning messages (on model 221.095/195) 

Function sequence for regenerative braking system control/ warning messages (on model 221.095/195) 

With regenerative braking a part of or the total braking torque is produced by the integrated starter alternator (A79). The electrical energy produced here is used to charge the high-voltage battery (A100g1) in the high-voltage battery module (A100). During regenerative braking, the instrument cluster actuates the regenerative braking system indicator lamp (A1e20). The ME-SFI control unit transmits the corresponding request to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.

If the regenerative braking system control unit (N30/6) detects an ESP malfunction, the ABS indicator lamp (A1e17) lights up and appropriate messages additionally appear in the multifunction display. The instrument cluster actuates the ESP warning lamp in the event of an ESP control intervention function.

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.

Function sequence for passive ESP switching 

Up to 31.8.09:

The ESP can be switched to passive mode manually by pressing the ESP OFF switch (S6/2s11) while 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 sends it via the interior CAN (CAN B) to the central gateway control unit and from there via the chassis CAN to the ESP control unit (N47-5) and via the central CAN to the instrument cluster in order to actuate the ESP indicator lamp.

As of 1.9.09

The ESP can be switched to passive mode manually in the "Assistance" menu. If the ESP is switched to passive mode, the instrument cluster actuates the ESP indicator lamp. The instrument cluster sends the ESP status "activated" or "deactivated" via the central CAN to the central gateway control unit and via the chassis CAN to the ESP control unit (except model 221.095/195) or to the regenerative braking system control unit (on model 221.095/195).

Additional function requirements for cruise control control/ warning messages (on model 216 without code (219) Distronic (DTR) or without code (233) DISTRONIC PLUS) 

IMPORTANT The vehicle speed is calculated from the wheel speeds that the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) makes available via the chassis CAN, central gateway control unit and central CAN.

Function sequence for cruise control control/warning messages (on model 216 without code (219) Distronic (DTR) or without code (233) DISTRONIC PLUS) 

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 

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 speed 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 electronic 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 permanently governed on the instrument cluster to a value between 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. 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 (with code (233) DISTRONIC PLUS or on model 216 up to 31.8.10 with code (219) Distronic (DTR)) 

Function sequence for Distronic control/warning messages (with code (233) DISTRONIC PLUS or on model 216 up to 31.8.10 with code (219) Distronic (DTR)) 

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 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 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:

Additionally, if distance warning is switched on, the distance warning status indication (A1e23) lights up. If the vehicle undershoots the safe distance to the vehicle in front, the DTR controller unit (A89) sends an appropriate signal via the vehicle dynamics CAN (CAN H) to the radar sensors control unit (SGR) (N62/1) (with code (233) DISTRONIC PLUS, without code (237) Active Blind Spot Assist, without code (238) Active Lane Keeping Assist, model 221 with code (239) Plus Light adaptive cruise control) or to the video and radar sensor system control unit (N62/2) (with code (237) Active Blind Spot Assist, with code (238) Active Lane Keeping Assist). The radar sensors control unit or the video and radar sensor system control unit forwards 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 

Function sequence for Safety Brake Control indicator/warning messages 

If the ESP is switched to passive mode or with an ESP control intervention function, the instrument cluster actuates the ESP warning lamp. If the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) detects ESP malfunctions, the ABS indicator lamp (A1e17) lights up and appropriate messages additionally appear in the multifunction display. Fault messages are placed on the chassis CAN by the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195). The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.

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, actuates the airbag indicator and warning lamp (A1e15) and issues appropriate messages via the multifunction display.

Additional function requirements, PRE-SAFE warning messages 

PRE-SAFE warning messages function sequence 

If a fault is present in the PRE-SAFE system, the left front reversible emergency tensioning retractor (A76) (on model 221) or the right front reversible emergency tensioning retractor (A76/1) (on model 221) sends appropriate 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.

Function sequence for STH warning messages (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 detects an error or a malfunction in the STH, it sends 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 (without code (475) Tire pressure monitor (Premium)) 

Tire pressure loss warning function sequence (without code (475) Tire pressure monitor (Premium) 

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 ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) detects a pressure loss at a tire, it sends 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 on the multifunction display.

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

Function sequence for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium)) 

If the RDK control unit (N88) identifies a pressure loss on a tire, it transmits a corresponding signal

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 (A1e66) and issues appropriate messages via 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 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 

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 controller 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 controller 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) 

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 recognize a valid transmitter key (A8/1) or the DIRECT SELECT gear selector switch (S16/13) is not in the "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 passes on all the relevant information to the instrument cluster via the central CAN.

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 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 (on model 221 without code (487) Active Body Control (ABC), on model 216 with code (489) AIRmatic (air suspension with continuous damper adjustment)) 

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

Function sequence for AIRmatic control/warning messages (on model 221 without code (487) Active Body Control (ABC), on model 216 with code (489) AIRmatic (air suspension with continuous damper adjustment)) 

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 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, they are all displayed.

Additional function requirements for Active Body Control (ABC) control/warning messages (on model 221 with code (487) Active Body Control (ABC), on model 216 without code (489) AIRmatic (air suspension with continuous damper adjustment)) 

Function sequence for ABC control/warning messages (on model 221 with code (487) Active Body Control (ABC), on model 216 without code (489) AIRmatic (air suspension with continuous damper adjustment)) 

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).

It is also possible to change the suspension tuning 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 them on the interior CAN.

System and warning messages with operating instructions for the driver are also shown on the multifunction display. For this purpose, the ABC control unit (N51/2) transmits corresponding information on the chassis CAN. The central gateway control unit forwards this 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 and model 216 as of 1.9.10 with code (230) Exclusive parking assist) 

IMPORTANT The "trailer recognized" status is transmitted by the trailer recognition control unit (N28/1) on the interior CAN.

The ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) sends active ABS/ESP control intervention functions to the instrument cluster via the chassis CAN, central gateway control unit and central CAN.

Function sequence for parking system control/warning messages (with code (220) PARKTRONIC or on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (230) Exclusive parking assist) 

PARKTRONIC:

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

The central gateway control unit forwards them 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 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 in model 221 as of 1.6.09 or in model 216 as of 1.9.10):

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) sends information about the current transmission selector lever position to the PTS control unit via the drive train CAN (CAN C), ME-SFI [ME] control unit or CDI control unit and chassis CAN.

Additional function requirements, ATA control/warning message (with code (551) Antitheft alarm system (ATA)) 

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

The rear SAM control unit with fuse and relay module (N10/2) is the master control unit for the antitheft 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 identifies an error or a malfunction, it sends corresponding information

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

Additional function requirements for ATTENTION ASSIST control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10) 

Function sequence for Attention Assist control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10) 

Attention assist assists the driver on long monotonous trips e.g. on freeways and expressways in a vehicle speed range of v = 80 to 180 km/h.

If attention assist establishes driver fatigue or increasing inattentiveness, it proposes a break. The attention assist assesses driver fatigue or increasing inattentiveness by the analysis of steering ability by means of steering wheel angle signals as well as driving conditions (time of day/night, driving time).

In the first t = 20 min. of monotonous driving individual parameters and a warning threshold are determined by the driver. When the warning threshold is reached a visual as well as an acoustic warning message are issued by the instrument cluster.

The ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) sends the appropriate request to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. The multifunction display in the instrument cluster then displays a prompt telling the driver to take a break, and a warning tone sounds.

IMPORTANT An active warning can be confirmed and thus terminated using the OK button (S110s6) on the left multifunction steering wheel button group (S110). The next warning is only possible after t > 15 minutes. The status of the multifunction steering wheel button group is made available to the ESP control unit (except model 221.095/195) or the regenerative braking system control unit (on model 221.095/195) via the steering LIN (LIN E1), steering column tube module and chassis CAN.

Additional function requirements for automatic lane recognition warning messages (as of 1.9.10 with code (238) Active Lane Keeping Assist or on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (476) Automatic lane recognition) 

Function sequence for automatic lane recognition warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (476) Automatic lane recognition or as of 1.9.10 with code (238) Active Lane Keeping Assist) 

The automatic lane recognition function recognizes when the vehicle pulls out of a lane and warns the driver so that he/she can react accordingly.

The traffic space in front of the vehicle is recorded and evaluated by the multifunction camera (A40/11). As soon as a front wheel 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.

IMPORTANT With code (238) Active Lane Keeping Assist, lane-correcting intervention by the brake system is requested if the driver does not react fast enough.

Additional function requirements for Speed Limit Assist control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (513) Speed Limit Assist) 

Function sequence for Speed Limit Assist control/warning messages (on model 221 as of 1.6.09 and model 216 as of 1.9.10 with code (513) Speed Limit Assist) 

The Speed Limit Assist function records the speed limits shown for the stretch being driven on by the vehicle. These are shown in the form of a traffic sign in the multifunction display.

The Speed Limit Assist function status is shown by a symbol in the multifunction display.

The display concept distinguishes between the following modes:

Permanent display:

In the case of permanent display in the multifunction display, the detected speed limit is displayed permanently until one of the following events occurs:

Information mode:

information mode the recognized speed limit can be displayed in the form of a traffic sign for a period of t = 5 s. This information can be acknowledged within this period. The information mode can be switched on or off by the driver.

The multifunction camera transmits corresponding requests for the control of the display via the chassis CAN, the central gateway control unit and central-CAN to the instrument cluster.

Additional function requirements for Adaptive Highbeam Assist control message (on model 221 as of 1.6.09 or model 216 as of 1.9.10 with code (608) Adaptive Highbeam Assist) 

Function sequence for Adaptive Highbeam Assist control message (on model 221 as of 1.6.09 or model 216 as of 1.9.10 with code (608) Adaptive Highbeam Assist) 

The adaptive highbeam function is an assistance function in which the headlamp range of the xenon bulbs is adapted to the distance of the nearest road user in front or approaching from the opposite direction. The status of the adaptive high beams function is shown in the multifunction display.

For this purpose, the multifunction camera transmits corresponding information via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

Additional function requirements for trailer recognition control/warning messages (on model 221 with code (550) Trailer hitch) 

Function sequence for trailer recognition control/warning messages (on model 221 with code (550) Trailer hitch) 

If the trailer recognition control unit identifies a malfunction in the electrical system (e.g. exterior lights) then a corresponding signal is relayed via the interior CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster outputs the respective fault message in the multifunction display.

Additional function requirements for door open reminder warning 

Function sequence, door open reminder warning 

If an open door, open trunk lid or open engine hood (with code (551) Antitheft alarm system (ATA [EDW])) is detected at a speed of v > 3 km/h, the instrument cluster issues an acoustic warning and displays an appropriate message in the multifunction display. The following control units provide the status of the doors, trunk lid and engine hood available via the interior CAN:

The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN.

Additional function requirements for exterior lighting (ABL) warning messages 

Exterior lighting (ABL) function sequence 

The functions of the relevant exterior lighting (ABL) components are permanently monitored.

If a fault is detected at a component, the monitoring control unit transmits an appropriate signal on the interior CAN. The central gateway control unit passes on all the relevant information to the instrument cluster via the central CAN. The instrument cluster receives this data and issues a corresponding message on the multifunction display.

The following control units monitor the function of the relevant exterior lighting (ABL) components:

Function sequence for brake wear indicator warning messages 

The reaching of the wear limit for the front axle brake pads is detected by the right front brake pad contact sensor (S10/2) and the reaching of the wear limit for the rear axle brake pads is detected by the right rear brake pad contact sensor (S10/4).

When the wear limit for the front brake pads is reached, the vehicle ground is switched through to the front SAM control unit via the front brake pad contact sensor.

When the wear limit for the rear brake pads is reached, the vehicle ground is switched through to the rear SAM control unit via the rear brake pad contact sensor.

The respective SAM control unit then transmits a corresponding signal via the interior CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster receives this signal, actuates the brake fluid warning lamp and outputs a corresponding message via the multifunction display.

Additional function requirements for brake fluid level warning messages 

Function sequence for brake fluid level warning messages 

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

The status of the brake fluid check switch is read in by the front SAM control unit. When the fill level is too low the front SAM control unit transmits a corresponding signal to the instrument cluster via the interior CAN, central gateway control unit and central CAN.

The instrument cluster receives the signal, actuates the brake fluid warning lamp and issues a corresponding message via the multifunction display.

Additional function requirements for windshield washer system fluid level warning messages 

Function sequence for windshield washer system fluid level warning messages 

The fluid level in the washer fluid reservoir is monitored by the windshield washer system fluid level indicator switch (S42).

The status of the windshield washer system fluid level indicator switch is read in by the front SAM control unit. When the fill level is too low the front SAM control unit transmits a corresponding signal to the instrument cluster via the interior CAN, central gateway control unit and central CAN. The instrument cluster receives this signal and issues a corresponding message on 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 takes place via the left turn signal indicator lamp and right turn signal indicator lamp.

Additional function requirements for engine-control control/ warning messages 

Function sequence for engine-control control/warning messages 

If a fault is present in the injection system, ignition system or exhaust gas system, the ME-SFI control unit transmits a corresponding signal to the instrument cluster via the chassis CAN, central gateway control unit and central CAN. The instrument cluster then actuates the engine diagnosis indicator lamp (A1e58).

Additional function requirements for tank cap warning (with code (494) USA version) 

Function sequence for tank cap warning (with code (494) USA version) 

If the rear SAM control unit identifies an open tank cap, it transmits a corresponding signal via the interior CAN, central gateway control unit and central CAN to the instrument cluster. The instrument cluster receives this signal, actuates the fuel reserve warning lamp (A1e4) so that it flashes and issues a corresponding message via the multifunction display.

Function sequence for central locking acoustic feedback (as of 1.9.10) 

The acoustic feedback must be selected and activated in the multifunction display using the left multifunction steering wheel button group and right multifunction steering wheel button group (S111). The status of the acoustic feedback is sent by the instrument cluster via the central CAN to the central gateway control unit and from there to the front SAM control unit via the interior CAN.

Function sequence for ECO start/stop function (with code (B03) ECO start/stop function) 

The ECO start/stop function can be activated or deactivated using a menu in the instrument cluster.

The status of the ECO start/stop function is signaled by the ECO indicator in the multifunction display.

The request for this is sent by the ME-SFI [ME] control unit via the central CAN to the central gateway control unit and from there via the chassis CAN to the instrument cluster.

The ECO indicator can be displayed in two colors:

Electrical function schematic of instrument cluster, control/warning message Model 216 PE54.30-P-2054-97CAA
STH control unit, component description A6n1
With code (228) Stationary heater		 GF83.70-P-4200LE
Component description for electric parking brake controller unit A13 GF42.20-P-5000LE
Component description for COMAND controller unit A40/3
With code (526) COMAND with single DVD drive (without navigation) or code (527) COMAND APS with single DVD drive (with navigation system)		 GF82.85-P-3136LE
With code (529) HIGH Class Japan GF82.85-P-3136LEJ
With code (530) COMAND APS USA (with navigation system) GF82.85-P-3136LEU
Component description for multifunction camera A40/11
On model 221 as of 1.6.09 or model 216 as of 1.9.10 with code (238) Active Lane Keeping Assist or code (476) Automatic lane recognition or code (513) Speed Limit Assist or with code (608) Adaptive Highbeam Assist		 GF54.21-P-3300LE 
Component description for intelligent servo module for DIRECT SELECT A80
With transmission 722.9 (except 722.931/950)		 GF27.19-P-4020AHS
DTR controller unit, component description A89
On model 216 up to 31.8.10 with engine 156, 273, 275 and code (219) Distronic (DTR)		 GF30.30-P-3210LEA
On model 216 up to 31.8.10 with engine 156, 273, 275 and code (233) DISTRONIC PLUS GF30.30-P-3210LE
On model 216 as of 1.6.09 up to 31.8.10 with engine 156, 273, 275 and code (233) Distronic Plus GF30.30-P-3210LEB
On model 216.3 as of 1.9.10
With code (233) DISTRONIC PLUS
with code (237) Active Blind Spot Assist		 GF30.30-P-3210LED
Component description for Xenon headlamp control unit E1n1, E2n1 GF82.10-P-2114LE
Component description for restraint systems control unit N2/7 GF91.60-P-4048LE
Component description for ME-SFI [ME] control unit N3/10
With engine 156		 GF07.61-P-6000MAS
Component description for front SAM control unit with fuse and relay module N10/1 GF54.21-P-6070LE 
Component description for rear SAM control unit with fuse and relay module N10/2 GF54.21-P-6030LE 
Left front seat control unit, component description N32/1 GF91.29-P-5230LE
Right front seat control unit, component description N32/2 GF91.29-P-5240LE
Component description for ESP control unit N47-5
Model 216.3, 221 (except 221.095/195)		 GF42.45-P-5118LE
AIRmatic with ADS control unit, component description N51
Model 216.3 up to 31.5.09 with code (489) AIRmatic (air suspension with continuous damper adjustment)		 GF32.22-P-5108LE
on model 216.3 as of 1.6.09 with code (489)
AIRmatic (air suspension with continuous damper adjustment))		 GF32.22-P-5108LEA
ABC control unit, component description N51/2
on model 216.3 without code (489) AIRmatic (air suspension with continuous damper adjustment)		 GF32.50-P-4501LE
Component description for PARKTRONIC control unit N62
On model 216 up to 31.8.10		 GF54.65-P-5001LE
on model 216 as of 1.9.10
with code (220) PARKTRONIC or code (230)
Exclusive parking assist		 GF54.65-P-5001LEA
Component description for radar sensors control unit N62/1
Up to 31.8.10 with code (233) DISTRONIC PLUS		 GF30.30-P-3301LE
Up to 31.8.10 with code (234) Blind Spot Assist, GF30.30-P-3301LEB
Video and radar sensor system control unit, component description N62/2
On model 216.3, 221 (except 221.095 /195) as of 1.9.10
with code (233) DISTRONIC PLUS
with code (237) Active Blind Spot Assist with code (238) Active Lane Keeping Assist		 GF30.30-P-3304LE
Component description for left door control unit N69/1
Model 216		 GF72.29-P-4124LA
Component description for right door control unit N69/2
Model 216		 GF72.29-P-4128LA
Component description for Keyless-Go control unit N69/5
With CODE (889) Keyless Go		 GF80.61-P-4204LE
Upper control panel control unit, component description N72/1 GF54.21-P-6040LE 
EZS control unit, component description N73 GF80.57-P-6003LE
Component description for steering column tube module N80 GF54.21-P-6050LE 
Component description for TPM [RDK] control unit N88
For code (494) USA version or code (475)
Tire pressure monitor (Premium), Siemens up to 31.5.09		 GF40.15-P-5123LE
With code (475) Tire pressure monitor (Premium), Schrader
As of 1.6.09		 GF40.15-P-5123LEA
Component description for central gateway control unit N93 GF54.21-P-4170LE 
Night View Assist control unit, component description N101
with code (610) Night View Assist		 GF54.30-P-6200LE
Component description for Weight Sensing System (WSS) control unit N110
Model 216 with code (494) USA version		 GF91.60-P-4069LAU
Component description for emergency call system control unit N123/4
With code (359) TELE AID emergency call system		 GF82.95-P-3212LEU
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