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GF54.30-P-2001FL Control/warning Messages, Function
Function requirements, general
^ Circuit 15R ON
The electronic ignition lock control unit makes available the circuit status of circuit 15 (N73) on the chassis CAN (CAN E).
Control/warning messages, general
The instrument cluster (A1) indicator and warning messages notifies the driver about the current states 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 control/warning messages:
The visual indicator and warning messages are displayed using the following instrument cluster components:
- Multifunction display (A1p13)
- Indicator/warning lamps
Audible control/warning messages:
The acoustic indicator and warning messages are issued using the following instrument cluster components:
- Warning buzzer (A1h1)
- Turn signal ticking via function check for turn signal lights, acoustic (A1h2)
The messages shown on the multifunction display are split up according to their level of urgency into four categories:
- Category 1 (messages with highest priority):
Messages in category 1 indicate hazardous conditions and situations and they have priority over messages with lower priority.
These messages are displayed and automatically archived in the message memory within a maximum of t = 2 s after they occur, and cannot be acknowledged. When they occur, a brief warning is emitted by the buzzer.
- Category 2 (messages with medium priority):
Messages in category 2 require action from the driver and appear with a temporary delay of maximum t = 2 s. These messages also include operator feedback. Category 2 messages can be acknowledged. 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). No warning chime is emitted.
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 cruise-control control/warning messages
^ Distronic control/warning messages function sequence (with code (233) DISTRONIC PLUS)
^ Function sequence for control/warning messages for the Electronic Stability Program (ESP)
^ Function sequence for control/warning messages for supplemental restraint system
^ PRE-SAFE warning messages function sequence
^ Function sequence, national seat belt reminder warning
^ Function sequence for tire pressure loss warner warning messages (without code (475) Tire pressure monitor (premium))
^ Function sequence for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium))
^ Function sequence for steering servo warning message (with code (213) Speed-sensitive power steering)
^ Function sequence for emergency call system control/warning messages (with code (359) TELE AID emergency call system)
^ Function sequence for antitheft alarm system (ATA [EDW]) control/warning messages (with code (551) Antitheft alarm system (ATA [EDW]))
^ Function sequence for Keyless-Go control/warning messages (with code (889) Keyless Go)
^ Function sequence for stationary heater control/warning messages (with code (228) Stationary heater)
^ Function sequence for AIRMATIC control unit indicator/warning messages (with code (489) AIRMATIC (air suspension with continuously adjustable damping) or code (488) Steel/air suspension)
^ Function sequence for support systems indicator/warning messages
^ Night View Assist warning messages function sequence (with code (610) Night View Assist)
^ Function sequence for "RACE START" warning messages (model 212.077/277)
^ Function sequence for trailer hitch warning message (with code (550) Trailer hitch)
^ Memory adjustment control messages function sequence (with code (275) Memory package for electrically adjustable front seats)
^ Function sequence for audio/communication/navigation control messages
^ Function sequence for parking assist control messages (with code (220) PARKTRONIC or code (230) Exclusive parking assist)
^ Function sequence for wiper system control messages (model 212.2)
^ Function sequence for warning messages for the exterior lights (ABL)
^ Function sequence for lights on reminder warning
^ Door open reminder warning function sequence
^ Parking brake warning function sequence
^ Function sequence for speed warning (with code (623) Gulf States version)
^ Function sequence for coolant and coolant temperature warning messages
^ Function sequence, engine oil level warning
^ Function sequence for preglow indicator lamp (with diesel engine)
^ Function sequence for transmission control warning messages (transmission 722)
^ 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 filler cap warning (with code (494) USA version)
Additional function requirements for cruise-control control/ warning messages
^ Circuit 61 ON
^ Vehicle speed v > 30 km/h
The CDI control unit (N3/9) (on diesel engine) or the ME-SFI [ME] control unit (N3/10) (on gasoline engine) sends the status of circuit 61 to the chassis CAN. The instrument cluster calculates the vehicle speed from the wheel speeds, which are provided to the chassis CAN by the Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or by the Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS).
Function sequence for cruise-control control/warning messages
The cruise control regulates the vehicle speed to an adjustable value and is activated using the cruise control lever (S40/4).
System malfunctions or faults are detected by the Electronic Stability Program control unit. In this case, the Electronic Stability Program control unit sends corresponding information through the chassis CAN to the instrument cluster.
The instrument cluster receives this data and then issues corresponding messages on the multifunction display.
The cruise-control control/warning messages consist of the
following subfunctions:
^ Function sequence for cruise control display
^ Function sequence for variable speed limiter display (without code (494) USA version)
^ Permanent limiter display function sequence (without code (494) USA version)
Function sequence for cruise control display
When the cruise control is switched on, the scale in the speedometer (A1p8) is shown in the form of an open 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 (without code (494) USA version)
The variable speed limiter restricts the vehicle speed to an adjustable value.
If the variable speed limiter is switched on, the segment ring in the speedometer lights up between the minimum speed and the set speed limit.
The variable speed limiter can not be activated in parallel to the cruise control or the Distronic (with code (233) DISTRONIC PLUS).
Permanent limiter display function sequence (without code (494) USA version)
The vehicle's maximum speed can be limited permanently on the instrument cluster to a value that lies between v = 160 km/h (e.g. for winter-tire operation) and the maximum speed.
If the permanent limiter is activated, the segment ring lights up from the start of the dial to the selected speed limit.
If the set speed is exceeded, a warning message is shown on the multifunction display. 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, Distronic control/warning messages (with code (233) DISTRONIC PLUS)
^ Vehicle speed v > 30 km/h
Distronic control/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:
- Vehicle speed set
- Current distance to vehicle ahead
- Following distance
If the veh. drops below the safe distance to the car ahead, the DISTRONIC electric controller unit (A89) sends a corresponding signal over the dynamics CAN (CAN H) to the radar sensors control unit (N62/1) (up to 31.5.10) or to the video and radar sensor system control unit (N62/2) (as of 1.6.10).
The radar sensors control unit or the video and radar sensor system control unit forwards 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.
Additional function requirements for function sequence for ESP control/warning messages
^ Circuit 15 ON (provided by electronic ignition lock control unit)
Function sequence for ESP control/warning messages
If the ESP is switched to passive when the engine is running, the Electronic Stability Program control unit 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 212 except model 212.077/277 the ESP is connected passively as follows:
- Up to 31.5.10 through the ESP button (S6/1s5)
- As of 1.6.10 through the "Assist" menu in the instrument cluster
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.
The scroll forward/back button (S110s1) of the left multifunction steering wheel button group (S110) can be used to scroll between the respective menus and submenus. Selection is then made by pressing the OK button (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.
On model 212.077/277 different ESP modes can be selected. The active ESP mode is shown in the multifunction display. The following ESP modes can be selected:
- "ESP ON"
- "ESP-SPORT" (up to 31.5.10) or "Sport Handling Mode" (as of 1.6.10) (ESP operates with adapted control thresholds)
- "ESP OFF" (ESP switched to passive)
The ESP mode "ESP-OFF" or "ESP-SPORT" (up to 31.5.10) or "Sport Handling Mode" (as of 1.6.10) is requested by pressing the ESP Sport Off AMG button (S193/1). The transmission mode control unit (N145) reads in the status of the ESP Sport Off AMG button and sends it over the chassis CAN to the Electronic Stability Program control unit. The Electronic Stability Program control unit switches to the required ESP mode and sends the "ESP-OFF" or "ESP-SPORT" (up to 31.5.10) or "Sport Handling Mode" (as of 1.6.10) status through the chassis CAN to the instrument cluster.
The instrument cluster then actuates the ESP/ASR OFF warning lamp(R1) (A1e32) or the ESP SPORT indicator lamp (A1e46) to match the active ESP mode. A message is also shown on the multifunction display which has to be acknowledged using the OK button. The ESP-ON" message is automatically hidden after t = 5 s.
If ESP faults or malfunctions are recognized by the Electronic Stability Program control unit, it sends corresponding information in the same manner.
This is received by the instrument cluster, which actuates the Electronic Stability Program warning lamp and forwards corresponding messages over the multifunction display.
Additional function requirements for supplemental restraint system control/warning messages
^ Circuit 15 ON (provided by electronic ignition lock control unit)
Function sequence for control/warning messages for supplemental restraint system
The SRS is monitored by the SRS control unit (N2/10). If SRS faults or malfunctions are recognized by the SRS control unit, it sends corresponding information over the chassis CAN to the instrument cluster.
The instrument cluster receives this information and actuates the supplemental restraint system indicator lamp (A1e15).
Additionally, corresponding messages are shown on the multifunction display.
Additional function requirements, PRE-SAFE warning messages
^ Circuit 15 ON (provided by electronic ignition lock control unit)
PRE-SAFE warning messages function sequence
The PRE-SAFE functions are monitored by the left front reversible emergency tensioning retractor (A76) and the right front reversible emergency tensioning retractor (A76/1) If PRE-SAFE function faults or malfunctions are recognized by a reversible emergency tensioning retractor, it sends 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 multifunction display.
Additional function requirements, national seat belt reminder warning
^ Circuit 61 ON (signal supplied by CDI control unit or ME-SFI [ME] control unit)
^ Circuit 15 ON (with code (498) Japan version) (provided by electronic ignition lock control unit)
National seat belt reminder warning function sequence
If, immediately prior to starting a journey or during a journey, a seat belt is detected to be not fitted, the instrument cluster issues a country-specific optical and acoustic seat belt reminder warning. The instrument cluster evaluates the following information for issuing a country-specific seat belt reminder warning:
- Supplied by the supplemental restraint system control unit on the chassis CAN:
- Driver seat belt buckle restraint system switch status (S68/3)
- Front passenger seat belt buckle restraint system switch status (S68/4)
- Front passenger seat occupied status
- Sent by rear SAM control unit to body CAN (CAN B):
- Left rear seat belt buckle switch status (S68/5)
- Right rear seat belt buckle switch status (S68/6)
- Center rear seat belt buckle switch status (S68/14)
The seat belt reminder message for the front passenger is only issued, if the front passenger seat is recognized as occupied. The rear seat belt reminder warning is only issued, if the status of a rear seat belt buckle switch changes during a journey.
If a seat belt is not fitted, the supplemental restraint systems control unit sends a corresponding signal over the chassis CAN to the instrument cluster.
The manner of how the seat belt reminder warning is issued differs in whether the seat belt reminder warning is prescribed by law or not and is incorporated into the assessment through the New Car Assessment Program (NCAP).
NCAP is an assessment program for safety in new vehicles.
- Countries with seat belt reminder warning prescribed by law (extended NCAP): Japan, USA, Canada, Arab States of the Gulf and Korea
- Countries without legally prescribed seat belt reminder warning (Euro NCAP): Economic Commission for Europe (ECE), China and Australia.
In countries in which the seat belt reminder is prescribed by law (extended NCAP), the seat belt warning lamp (A1e9) is activated for a time interval of t = 6 ±2 s. It is irrelevant here whether the driver seat belt is fitted or not.
If the driver's seat belt is not being worn, the instrument cluster also issues an acoustic warning over the warning buzzer.
If the driver seat belt is fitted during this time interval, the acoustic warning is canceled.
An assessment of whether the front passenger seat belt is fitted or not given during this time interval.
Only after the time interval of t = 6 s has expired, does the assessment of both seat belts occur.
In countries in which the seat belt reminder warning is not prescribed by law, the seat belt warning lamp is only actuated during the indicator lamp test.
Immediately after detecting that the engine is running (circuit 61 ON) both the status of the driver seat belt buckle restraint system switch as well as the status of the front passenger seat belt buckle restraint system switch are assessed.
If a seat belt is defined to not be fitted, the instrument cluster actuates the seat belt warning lamp.
If the vehicle starts to move, when it reaches a speed of v ≥25 km/h, further successive acoustic warnings are issued.
Three or four acoustic warnings are issued in accordance with the seat belt reminder warning. While they are being issued the seat belt warning lamp is actuated by flashing it at a frequency of f = 2 Hz. After all the acoustic warning phases have expired the seat belt warning lamp is permanently actuated.
- Acoustic warning phase 1:
As the vehicle starts to drive off, acoustic warning phase 1 also starts in the background. When a speed of v ≥25 km/h is reached a quiet acoustic warning is sounded at an interval of t = 4 s. The acoustic warning phase 1 last for a maximum t = 20 s. This is then followed by a transition to acoustic warning phase 2.
- Acoustic warning phase 2:
After expiry of acoustic warning phase 1 and as from a speed of v ≥25 km/h a quiet acoustic warning is sounded for maximum t = 20 s at an interval of t = 2 s.
The transition into warning phase 3 follows.
- Acoustic warning phase 3:
After expiry of acoustic warning phase 2 and from a speed of v ≥25 km/h a quiet acoustic warning is sounded for maximum t = 20 s at an interval of t = 1 s.
The transition into warning phase 4 follows.
- Acoustic warning phase 4 (EURO NCAP only):
After expiry of acoustic warning phase 3 and as from a speed of v ≥25 km/h a quiet acoustic warning is sounded for maximum t = 93 s at an interval of t = 0.5 s.
Cancellation of seat belt reminder warning:
- The last acoustic warning phase is fully completed.
- The belt was fitted during the active seat belt reminder warning.
- When the vehicle is stationary the vehicle door on the actuating side is opened.
Seat belt reminder warning reactivation:
- Seat belt release has been detected again.
- If the vehicle is at a standstill and the driver or front passenger door is opened and then closed again
- Ignition sequence as from circuit 61 ON detected again.
The rear seat belt reminder warning is realized by monitoring the number of belt tabs inserted into the seat belt buckles.
If this situation alters during a journey or at vehicle standstill, without a rear door being opened, the instrument cluster actuate the seat belt warning lamp and the warning buzzer to issue the rear seat belt reminder warning.
If the seat belt reminder warning is issued when the vehicle is moving, it is displayed again another t = 30 s when the vehicle is determined to be at rest. This is contingent on a change in the door status for a rear door while the vehicle is at a standstill. The rear seat belt reminder warning, however, does not exert any effect on restraint equipment deployment, it only serves as information for the driver.
Additional function requirements for tire pressure loss warner warning messages (without code (475) Tire pressure monitor (premium))
^ Vehicle speed v > 0 km/h (calculated by instrument cluster)
Function sequence for tire pressure loss warner warning messages (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 a pressure loss on a tire is recognized by the Electronic Stability Program control unit, it sends corresponding information over the chassis CAN to the instrument cluster. The instrument cluster reads in the information and then issues a "Check tire pressure" message on the multifunction display.
Additional functional requirements for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium))
^ Circuit 15 ON (provided by electronic ignition lock control unit)
Function sequence for tire pressure monitor warning messages (with code (475) Tire pressure monitor (Premium))
The air pressure in the tires is recorded by the following components and forwarded to the tire pressure monitor control unit (N88) by radio:
- Left front tire pressure sensor (A69/1)
- Right front tire pressure sensor (A69/2)
- Left rear tire pressure sensor (A69/3)
- Right rear tire pressure sensor (A69/4)
If a pressure loss on a tire is recognized by the tire pressure monitor control unit, it sends corresponding information over the chassis CAN to the instrument cluster.
The instrument cluster receives it, actuates the tire pressure monitor warning lamp (A1e66) and outputs corresponding messages over the multifunction display.
Additional function requirements for steering servo warning message (with code (213) Speed-sensitive power steering)
^ Circuit 61 ON (signal supplied by CDI control unit or ME-SFI [ME] control unit)
Function sequence for steering servo warning message (with code (213) Speed-sensitive power steering)
The Electronic Stability Program control unit regulates the steering servo through demand-controlled actuation of the power steering pump quantity control valve (Y10/1). The Electronic Stability Program control unit forwards corresponding data via the chassis CAN to the instrument cluster in the event of any malfunctions in the steering servo. The instrument cluster receives this data and then issues a corresponding message on the multifunction display.
Function sequence for emergency call system control/warning messages (with code (359) TELE AID emergency call system)
The vehicle related services display is shown in the multifunction display. If the emergency call system control unit (N123/4) recognizes a fault during a self test or if the emergency call system is activated, a corresponding message is shown on the multifunction display. The required information is sent by the emergency call system control unit over the diagnostic CAN (CAN D) to the front SAM control unit, which then forwards it over the chassis CAN to the instrument cluster.
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 and information messages to the instrument cluster over the interior CAN. The instrument cluster receives this data and then issues corresponding messages on the multifunction display.