GF54.30-P-2001RC Indicator/Warning Messages, Function
GF54.30-P-2001RC Indicator/warning Messages, Function
- refinement package
- as of model year 09
Indicator/warning messages, general
The indicator and warning messages of the instrument cluster (A1) are intended to inform the driver about the current statuses of the systems installed in the vehicle.
The instrument cluster can output indicator and warning messages in the following ways:
^ Visual indicator/warning messages
^ Acoustic indicator/warning tones
Visual indicator/warning messages
The instrument cluster can output visual indicator and warning messages in the following ways:
- Upper multifunction display (A1p13)
- Lower multifunction display (A1p15)
- Indicator/warning lamps
Acoustic indicator/warning tones
The acoustic warning tones are generated and output by the instrument cluster via the internal warning buzzer (A1h1) in the form of beeps at a frequency of f = 2.0Hz.
The turn signal knocking sound is made by the audible turn signal indicator (A1h2) integrated in the instrument cluster.
Warning messages are displayed in the upper multifunction display in the event of any operating faults. These warning messages are subdivided into three categories:
- Warning messages of the highest priority (category 1) These warning messages cannot be acknowledged and canceled. When they occur a short warning tone is issued via the warning buzzer and the fault is displayed in the upper multifunction display. Any category 2 and 3 warning messages are hidden.
- Warning messages of medium priority (category 2) These warning message can be acknowledged and canceled using the trip odometer reset button (A1s3). When they occur a short warning tone is issued via the warning buzzer and the fault is displayed in the upper multifunction display. Any category 3 warning messages are hidden.
- Warning messages of the lowest priority (category 3) These warning message can be acknowledged and canceled using the trip odometer reset button (). There is no warning tone.
These messages are divided into two subcategories and stored in the U and W-roll memories.
The U-roll memory is the directory of all unacknowledged warning messages which are shown in the upper multifunction display.
Warning messages of the same or higher priority are faded in after the expiry of the minimum display time of the preceding warning message.
Once the minimum display time for the warning message with the lowest priority the fault roll starts again at the warning message with the highest priority
All warning messages in the U-roll memory are displayed with increased brightness.
All the warning messages which occurred during the journey and were acknowledged are entered in the W-roll memory.
The W-roll memory can be accessed at any time in the menu of the upper multifunction display. Once the memory is called up, an initial picture is first displayed with the number of warning messages which occurred. The warning messages are then displayed in their priority order.
The following systems can request indicator/warning messages via the instrument cluster:
^ Cruise control
^ Electronic Stability Program (ESP)
^ Supplemental restraint system
^ Exterior lighting
^ Tire pressure loss warning (with code (477) Tire pressure loss warning)
^ Tire pressure monitor (with code (470) Tire pressure monitor (standard))
^ Audio/communication/navigation
(with code (510) Audio 20 with CD changer or
with code (523) MB Audio 20 radio or
with code (511) Audio 50 APS with DVD changer or
with code (525) MB Audio 50 APS radio or
with code (512) COMAND APS with DVD changer or
with code (527) COMAND APS with single DVD drive (with navigation)
^ Emergency call system (with code (359) TELE AID emergency call system)
^ Memory adjustment (with code (275) Memory package (driver seat, steering column, mirrors) or with code (242) Electrically adjustable front passenger seat with memory)
The following functions can request indicator/warning messages via the instrument cluster:
^ Doors OPEN warning
^ Vario roof warning
^ Lights on warning
^ Parking brake warning
^ Speed warning (with code (623) Gulf states version)
^ Key warning
^ National seat belt reminder warning
^ Coolant level
^ Engine oil level warning
^ Brake wear indicator
^ Brake fluid level indicator
^ Windshield washer system fluid level
^ Turn signal confirmation
Additional function requirements for cruise control
^ Vehicle speed v > 30 km/h
Cruise control
The display of the cruise control function consists of the following subfunctions:
^ Cruise control display function sequence
^ Variable speed limiter display function sequence
^ Permanent speed limiter display function sequence
Cruise control display function sequence
When the cruise control is activated via the CC [TPM] push button (S40/4), the set speed is displayed in the lower multifunction display.
Variable speed limiter display function sequence
When the variable speed limiter is activated via the CC [TPM] push button, the set speed limit is displayed in the lower multifunction display.
Permanent speed limiter display function sequence
The vehicle speed can be permanently limited to a value from 160 km/h to the maximum speed via the instrument cluster (e.g. for winter tire operation).
The permanent speed limiter can only be switched on via the corresponding menu in the instrument cluster.
Additional function requirements for ESP
^ Circuit 61 ON
ESP function sequence
If the ESP is switched passive via the ESP OFF switch (N72/1s1) when the engine is running or the ESP intervenes in the driving events, the ESP warning lamp (A1e41) is actuated. A fault is displayed via the ABS indicator lamp (A1e17) and via a message in the upper multifunction display.
Additional function requirements for supplemental restraint system
^ Circuit 15 On
Supplemental restraint system
If a fault is found by the restraint systems control unit (N2/7), the airbag indicator and warning lamp (A1e15) is actuated by the instrument cluster.
In addition, a message is displayed via the upper multifunction display.
Additional function requirements for exterior lights
^ Circuit 15 On
^ Circuit 58 ON
Exterior lights function sequence
If one or more defective lamps are detected by the following control units, this is shown via a message in the upper multifunction display:
- Driver-side SAM control unit with fuse and relay module (N10/1)
- Rear SAM control unit with fuse and relay module (N10/2)
- Left door control unit (N69/1)
- Right door control unit (N69/2)
Additional function requirements for tire pressure loss warner
^ Vehicle speed v > 0 km/h
Tire pressure loss warner function sequence
If the ESP and BAS control unit (N47-5) detects a significant pressure loss (different wheel speeds due to change in circumference) via the signals from the left front rpm sensor (L6/1), right front rpm sensor (L6/2), left rear rpm sensor (L6/3) and right rear rpm sensor (L6/4), this is indicated by a message in the upper multifunction display.
Additional function requirements for tire pressure monitor
^ Circ. 15 ON
Tire pressure monitor function sequence
The TPM [RDK] control unit (N88) reads in the left front TPM [RDK] wheel sensor (A69/1), right front TPM [RDK] wheel sensor (A69/2), left rear TPM [RDK] wheel sensor (A69/3) and right rear TPM [RDK] wheel sensor (A69/4).
If a relevant pressure loss is detected at one or more tires, this is indicated by the tire pressure monitor warning lamp (A1e66) lighting up.
In addition, a message appears in the upper multifunction display.
Additional function requirements for audio/communication/ navigation
^ Circ. 15 ON
Audio/communication/navigation function sequence
The information from the communication systems installed in the vehicle is displayed in the upper multifunction display. The instrument cluster receives the information from the following components:
- Radio (A2) (with code (510) Audio 20 with CD changer or with code (523) MB Audio 20 radio)
- Radio and navigation unit (A2/56) (with code (511) Audio 50 APS with DVD changer or with code (525) MB Audio 50 APS radio)
- COMAND operating, display and controller unit (A40/3) (with code (512) COMAND APS with DVD changer or with code (527) COMAND APS (with navigation))
Emergency call system function sequence
The vehicle-related services are shown in the upper multifunction display. If the emergency call system control unit (N123/4) detects a defect during its self-test or if the emergency call system is activated, a message is output.
Memory adjustment
The instrument cluster outputs an acknowledgement tone when a memory position is stored.
The request to output this acknowledgement tone is transmitted by the driver-side front seat adjustment control unit with memory (N32/1) (with code (275) Memory package (driver seat, steering column, mirror)) or by the passenger-side front seat adjustment control unit with memory (N32/2) (with code (242) Electrically adjustable front passenger seat with memory) to the instrument cluster via interior CAN.
Additional function requirements for door open reminder warning
^ Vehicle speed v > 3 km/h
Door open reminder warning function sequence
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, an acoustic warning is output and a message is displayed in the upper multifunction display.
The status of the doors is detected by the left door contact switch (S17/3) and right door contact switch (S17/4), the status of the trunk lid by the trunk lid rotary tumbler microswitch (S88/1) and the status of the engine hood by the ATA [EDW] engine hood switch (S62) (with code (551) Antitheft alarm system (ATA [EDW])). The respective status is read in by the rear SAM control unit and made available to the instrument cluster via interior CAN.
Additional function requirements for Vario roof warning
^ Vehicle speed v > 8 km/h
Vario roof warning function sequence
If an unlocked Vario roof is detected at a speed of v > 8 km/h by the soft top mechanism control unit (N52), an acoustic warning message is output via the instrument cluster.
Additional function requirements for lights on reminder
^ Circuit 15C OFF
^ Circuit 58 ON
Lights on reminder warning function sequence
When circuit 15C is OFF and the standing lamps/low beams are switched on with the driver door opened, an acoustic warning occurs via the instrument cluster and a message appears in the upper multifunction display. The status of the door contact switches is read in by the rear SAM control unit and made available to the instrument cluster via interior CAN.
Additional function requirements for parking brake on reminder warning
^ Vehicle speed v > 5 km/h
Parking brake warning function sequence
If at a speed of v > 5 km/h the parking brake indicator switch (S12) is operated, an acoustic warning is output via the instrument cluster and a message appears in the upper multifunction display.
The brake fluid and parking brake warning lamp (A1e7) is also actuated.
The signal from the parking brake indicator switch is read in by the driver-side SAM control unit and made available to the instrument cluster via the interior CAN.
Additional function requirements for vehicle speed warning
^ Vehicle speed v > 120 km/h
Vehicle speed warning
An acoustic warning is output by the instrument cluster at speeds of v > 120 km/h.
The acoustic warning is disabled at speeds of v < 117 km/h. The wheel speed is determined via the rpm sensors. The signals from the rpm sensors are read in by the ESP and BAS control unit and made available to the instrument cluster via the engine compartment CAN.
The instrument cluster calculates the speed by means of the wheel speed.
Additional function requirements for key warning
^ Circuit 15R OFF and
^ Rotary light switch (S1) in "Auto" position and
^ Driver door opened and
^ Rain/light sensor (B38/2) (with code (345) Rain sensor) detects "Night"
Key warning function sequence
If the driver door is opened when the function requirements are met, an acoustic and visual warning is output by the instrument cluster.
Additional function requirements for national seat belt reminder warning
^ Circuit 15 On
National seat belt reminder warning function sequence
The following signals are evaluated by the restraint systems control unit:
- Driver side seat belt buckle restraint systems switch (S68/3)
- Front passenger-side seat belt buckle restraint systems switch (S68/4)
- Assignment status of front passenger seat
The corresponding signals are made available to the instrument cluster.
The instrument cluster outputs a national, visual and acoustic warning.
Additional function requirements for coolant level
^ Circuit 15 On
Coolant level function sequence
If the level of the coolant is too low, the coolant level indicator switch (S41) transmits a signal to the driver-side SAM control unit which passes on this signal to the instrument cluster. The instrument cluster then outputs a warning via the upper multifunction display.
Additional function requirements for engine oil level warning
^ Circuit 15 On
Engine oil level warning function sequence
Engine 271, 272:
The oil level check switch is fitted in the oil pan to monitor the engine oil level (S43). It is read in by the ME-SFI [ME] control unit (N3/10). Where necessary, the ME-SFI [ME] control unit transmits a message to the instrument cluster via engine compartment CAN.
Engine 113:
The calculation for oil level measurement is performed in the central gateway control unit (N93), which forwards a corresponding signal to the instrument cluster.
The instrument cluster then outputs a message via the upper multifunction display.
Additional function requirements for brake wear indicator
^ Circuit 15 On
Brake wear indicator function sequence
The wear on the brake linings is detected by the ESP and BAS control unit via the right front brake pad contact sensor (S10/2) and right rear brake pad contact sensor (S10/4).
A warning message is output via the upper multifunction display if the wear is excessive.
Additional function requirements for brake fluid level indicator
^ Circuit 15 On
Brake fluid level indicator function sequence
An excessively low fill level of the brake fluid reservoir is detected by the brake fluid indicator switch (S11) and transmitted by the driver-side SAM control unit to the instrument cluster via interior CAN. As a result of this, the instrument cluster issues a visual warning message via the upper multifunction display and via the brake fluid and parking brake warning lamp or via the brake indicator lamp (A1e64) (with code (494) USA version).
Additional function requirements for fluid level of windshield washer system
^ Circuit 15 On
Windshield washer system fluid level function sequence
If the fill level of the washer fluid reservoir is too low, this is detected by the windshield washer system washer fluid indicator switch (S42), read in by the driver-side SAM control unit and made available to the instrument cluster.
The instrument cluster then outputs a warning via the upper multifunction display.
Turn signal confirmation
The acoustic feedback for activated turn signaling or activated hazard warning system is realized by the audible turn signal indicator (A1h2) in the instrument cluster.
The visual feedback takes place via the left turn signal indicator lamp (A1e1) and right turn signal indicator lamp (A1e2).
Additional function requirements for tank cap open warning message
^ Vehicle speed v > 5 km/h
Tank cap open warning message
If the instrument cluster receives a message from the ME-SFI [ME] control unit via engine compartment CAN that the tank cap is still open at a vehicle speed of v > 5 km/h, a message is issued by via the upper multifunction display.
