Displaying Indicator/Warning Messages Via Multifunction Display
Multifunction display (A1p13)
Various driver information is displayed in the multifunction display (A1p13).
In addition to the familiar readout of total distance travelled and trip odometer (basic display), the displays for the following systems can also be selected and read out in the multifunction display (A1p13).
- Audio
- Telephone (special equipment)
- Navigation (special equipment)
- Distronic (special equipment)
- Trip computer
In addition various fault messages and warning messages can be overlaid in the multifunction display (A1p13) as required.
Dividing up fault messages and warning messages into categories
These messages are divided up into 3 categories according to their priority.
- Messages with the highest priority are in category 1.
These messages cannot be acknowledged. A brief warning tone is also output when they occur. Any faults in categories 2 and 3 are faded out.
- Messages with a medium priority are in category 2.
These messages can be acknowledged with the reset button (r).
A brief warning tone is also output when they occur. Any faults in category 3 are laded out.
- Messages with the lowest priority are in category 3.
These messages can be acknowledged with the reset button (r).
No warning tone sounds.
Once a fault message is acknowledged the display changes to the previous display mask, if there are no other faults.
Warning tone
The above-mentioned warning tone sounds as a gong on model 215 as a buzzing tone on model 220.
NOTE: In addition a warning or indicator lamp is also actuated for some messages. These lamps come on as long as there is a fault. This also applies if the associated message has been acknowledged.
Storing messages
Category 1 messages are not stored. Most fault messages in categories 2 and 3 are however stored in a ring memory of the instrument cluster (A1) after acknowledgement. Unacknowledged fault messages in categories 2 and 3 are automatically added to the ring memory after terminal 15r OFF. A maximum of 16 messages can be stored. If another fault occurs, the oldest message is overwritten in each case.
Displays of warning messages, and fault messages
With a few exceptions (e.g. lights On warning, key inserted warning) fault messages are only displayed when the engine is running.
- Current messages
Current messages are overlaid immediately. If the fault only occurs briefly, messages in categories 2 and 3 are overlaid for at least 2 seconds
Messages in category 1 are only displayed while the fault exists.
- Several current messages
- If there are several faults with different priorities the message with the highest priority is displayed.
New messages of the same or higher priority fade out the message displayed previously.
- If there are several faults of the same category, the display changes the messages in cycles after 5 seconds each.
- Reminder of acknowledged messages
If messages were acknowledged while driving, these are displayed once again as a reminder when terminal 15r is OFF.
At the same time current messages fade out this reminder function e.g. lights On warning.
If there are no messages, the basic display appears after terminal 15r OFF.
- Displaying stored fault messages
The stored messages can be scrolled through when the instrument cluster (A1) is activated:
- Press the system selection pushbutton (S111s3) until the "--FAULTS" display appears in the multifunction display (A1p13).
- Scroll through the fault messages using the pushbuttons + and - setting of specific functions and volume control (S110s1). The messages are displayed in the order they were acknowledged.
Example
Four out of approx. 200 possible messages are shown below together with a brief description. If there are several faults, the sequence of the messages displayed is explained by means of an example:
- The windshield washer fluid level drops below the minimum mark. The category 3 message "WINDSHIELD WASHER FLUID/CHECK LEVEL" (Figure 1) appears in the multifunction display (A1p13).
- If a fault in the generator (G2) now also occurs, the category 2 message "BATTERY/GENERATOR CHECK - CONSULT WORKSHOP!" (Figure 2) is displayed. This message fades out the first message on account of its higher priority.
- If the coolant level now also drops below the minimum mark, the category 2 message "COOLANT/CHECK LEVEL!" (Figure 3) is displayed.
This display now changes every 5 seconds between this message and the message "BATTERY/GENERATOR CHECK-CONSULT WORKSHOP!" (figure 2), as there are now two messages with the same priority.
In the example it was assumed that no message had been acknowledged.
Message: "WINDSHIELD WASHER FLUID/CHECK LEVEL!"
This category 3 message is displayed if the windshield washer fluid level for the windshield washer system and headlamp cleaning system is below the minimum level.
The information is received from the right front SAM control module (N10/7) via the CAN interior.
For more details, refer to document "Voltage coding of engine coolant/Windshield washer fluid level, function". Voltage Coding of Coolant Level/Windshield Washer Fluid Level
Message "BATTERY/GENERATOR CHECK-CONSULT WORKSHOP!"
This category 2 message is displayed if the generator (G2) is not working properly but the engine speed is more than 200 rpm.
For more details, refer to document: "Battery charge and generator check, function" Battery Charge/Generator Check
Message: COOLANT/CHECK LEVEL!"
This category 2 message is displayed if the coolant drops below the minimum level. The information is received from the right front SAM control module (N10/7) via the CAN interior. For more details, refer to document: "Voltage coding of engine coolant/windshield washer fluid level, function". Voltage Coding of Coolant Level/Windshield Washer Fluid Level
Message: "DISPLAY DEFECTIVE/CONSULT WORKSHOP"
This category 2 message is displayed if there is a fault in the CAN interior and/or CAN engine compartment and as a result the connection to several control modules is faulty.
If the connection to only one control module is faulty, the symbol for the particular system is overlaid in position (2).