Messages
| Messages |
Below is a summary of the messages which are sent out by all the car's systems that are connected to a bus. It also shows which systems use the transmitted information. The purpose of the summary is to help you gain an understanding of the car's functional relationships, which is a fundamental prerequisite for rapid fault diagnosis.
DICE
| DICE transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
A/C
|
ON/OFF
|
Trionic
|
A/C (bus from ACC), coolant temperature (bus from Trionic), A/C pressure and evaporator temperature
|
|
A/C pressure
|
0 - 30 bar
|
Trionic
|
A/C pressure sensor
|
|
Current consumption
|
0 - 255 A
|
Trionic
|
Control module activation of relay outputs for radiator fans and electrically heated rear window
|
|
Position lights
|
ON/OFF
|
SID
|
Rear light RH or Rear light LH (bus value from TWICE)
|
|
Electrically heated rear window
|
ON/OFF
|
ACC
|
Control module activation of relay output for electrically heated rear window
|
|
Rear fog light faulty
|
YES/NO
|
SID
|
Control module current measurement of output to lamp
|
|
Idling speed increase
|
ON/OFF
|
Trionic
|
Radiator fan high speed activated once this trip
|
|
LH direction indicators repeater
|
ON/OFF
|
MIU, SID
|
Control module activation of output to lamps
|
|
RH direction indicators repeater
|
ON/OFF
|
MIU, SID
|
Control module activation of output to lamps
|
|
Rear fog light
|
ON/OFF
|
MIU
|
Control module activation of output to fog light
|
|
Reverse gear
|
ON/OFF
|
PMM, Trionic
|
Reversing lights switch
|
|
Sound
|
Acoustical information
|
SID
|
Control module programming and seat-belt buckle switches, driver's door or passenger's door open (bus from TWICE)
|
|
Ignition +B
|
ON/OFF
|
Twice, Audio system
|
Ignition switch
|
|
Ignition +15
|
ON/OFF
|
TWICE
|
Ignition switch
|
|
Ignition +54
|
ON/OFF
|
TWICE
|
Ignition switch
|
|
Ignition +50
|
ON/OFF
|
TWICE, ACC
|
+15 present but not +54
|
|
VIN
|
Chassis number
|
Audio
|
Control module programming
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact
|
TWICE
| TWICE transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
LH rear light faulty
|
YES/NO
|
SID
|
Control module current measurement of output to lamps
|
|
RH rear light faulty
|
YES/NO
|
SID
|
Control module current measurement of output to lamps
|
|
LH rear light
|
ON/OFF
|
DICE
|
Control module input supplied with current from lights switch
|
|
RH rear light
|
ON/OFF
|
DICE
|
Control module input supplied with current from lights switch
|
|
LH brake light faulty
|
YES/NO
|
SID
|
Control module current measurement of output to lamp
|
|
RH brake light faulty
|
YES/NO
|
SID
|
Control module current measurement of output to lamp
|
|
High-level brake light faulty
|
YES/NO
|
SID
|
Control module current measurement of output to lamp
|
|
Brake lights
|
ON/OFF
|
TCM, SID
|
Brake lights switch
|
|
Passenger seat occupied
|
YES/NO
|
ACC
|
Seat sensor
|
|
Sound
|
Acoustical information
|
SID
|
In connection with text message
|
|
Driver's door
|
OPEN/CLOSED
|
MIU, DMM, PSM, DICE
|
Door switch
|
|
Passenger's door
|
OPEN/CLOSED
|
MIU, DMM, PSM, DICE
|
Door switch
|
|
LH rear door
|
OPEN/CLOSED
|
MIU, DICE
|
Door switch
|
|
RH rear door
|
OPEN/CLOSED
|
MIU, DICE
|
Door switch
|
|
Boot lid
|
OPEN/CLOSED
|
MIU
|
Door switch
|
|
Test brake lights
|
ON/OFF
|
SID
|
Control module programming and brake lights switch
|
|
Horn
|
0: 6: 42 ms
|
SID
|
Anti-theft alarm function and central locking system function
|
|
Hazard flashers
|
ON/OFF
|
DICE
|
Anti-theft alarm function and central locking system function
|
|
Text message
|
Text information
|
SID
|
Anti-theft alarm function and central locking system function
|
|
Steering wheel location
|
LHD/RHD
|
ACC, PMM, MIU
|
Control module programming
|
|
Key correct
|
ON/OFF
|
Audio
|
Immobilization function
|
|
Immobilization
|
ON/OFF
|
Trionic
|
Immobilization function
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact.
|
ACC
| ACC transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Text message
|
Text information
|
SID
|
Increased user programming, demonstration of afterheating function (certain engine variants)
|
|
Sound
|
Acoustical information
|
SID
|
In connection with text message
|
|
A/C
|
ON/OFF
|
DICE
|
AUTO selected and outside temperature (bus from SID)
|
|
Electrically heated rear window
|
ON/OFF
|
DICE
|
Button on dashboard
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact
|
Audio system, main unit
| Audio transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Time RDS
|
Hours, Minutes, Seconds
|
SID
|
RDS reception
|
|
Date RDS
|
0 - 31
|
SID
|
RDS reception
|
|
Month RDS
|
January...December
|
SID
|
RDS reception
|
|
Sound
|
Acoustical information
|
SID
|
Button pressing on panel
|
|
Text message
|
Text information
|
SID
|
Display of audio information
|
|
CD changer control
|
Information for controlling CD changer
|
CD changer
|
Buttons on panel
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact
|
CDC
| CDC transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
CD changer information
|
Current settings
|
Audio
|
Information on a CD and its location
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact.
|
PMM
| PMM transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact.
|
MIU
| MIU transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Vehicle speed
|
km/h, mph
|
Trionic, DICE, SID, ACC, Audio, TWICE
|
Rear left wheel speed (lead from ABS)
|
|
Sound
|
Acoustical information
|
SID
|
Control module activation of central warning lamp or info display lamp
|
|
Fuel level
|
litres
|
SID, Trionic
|
Tank sensor, control module adjustment
|
|
Odometer reading
|
km, miles
|
SID
|
Display value
|
|
Identification number
|
--
|
TWICE
|
Value created in MIU when immobilization code is programmed in TWICE
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact.
|
SID
| SID transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Info Disp Lamp
|
ON/OFF
|
MIU
|
In connection with text message
|
|
Unit of measurement
|
Metric, Imperial (°F), Imperial (°C), US
|
ACC
|
The unit selected with the buttons
|
|
Language
|
English, German, French, Spanish, Swedish, Italian
|
ACC
|
The language selected with the buttons
|
|
Steering wheel controls
|
Seek >>, Seek <<, Vol +, Vol -, NXT, SRC
|
Audio
|
Button control module input
|
|
Rheostat value
|
0 - 100 %
|
Audio, ACC, DICE, MIU
|
Rheostat control module input
|
|
Rheostat Night Panel
|
0 - 100 %
|
Audio, ACC, DICE, MIU
|
Rheostat control module input reduced internally by a fixed value
|
|
Night Panel
|
ON/OFF
|
Audio, ACC, DICE, MIU
|
Button
|
|
Display lighting
|
0 - 100 %
|
Audio, ACC, DICE, MIU
|
Rheostat control module input or light sensor, highest value
|
|
Light intensity in cabin
|
Lux
|
MIU
|
Light sensor
|
|
Time engine switched off
|
Minutes
|
ACC
|
+ 15
|
|
Outdoor temperature
|
°C
|
ACC, TWICE, DICE
|
Outside temperature sensor, control module adjustment
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact
|
PSM
| PSM transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Memory store button
|
ON/OFF
|
PMM
|
Button pressing
|
|
Memory button 1-3
|
1, 2, 3
|
PMM
|
Button pressing
|
|
Sound
|
Acoustical information
|
SID
|
When seat setting stored
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact
|
Trionic
| Trionic transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Kick-Down
|
ON/OFF
|
TCM
|
Pedal position sensor 1
|
|
Check engine lamp
|
ON/OFF
|
MIU
|
Internal diagnosis
|
|
Shift Up lamp
|
ON/OFF
|
MIU
|
Front right wheel speed (lead from ABS)
|
|
CRUISE lamp
|
ON/OFF
|
MIU
|
Cruise Control function
|
|
Fuel consumed since start
|
0-65535 ml
|
MIU, SID
|
Fuel injection function
|
|
Engine has started
|
ON/OFF
|
ACC, DICE
|
Crankshaft position sensor
|
|
Engine rpm
|
0-7000 rpm
|
MIU, TCM, ACC
|
Crankshaft position sensor
|
|
Engine torque
|
-100 - 400 Nm
|
TCM
|
Mass air flow sensor
|
|
Coolant temperature
|
-40 - 215 °C
|
MIU, DICE, ACC
|
Coolant temperature sensor
|
|
Accelerator position
|
0 - 100 %
|
TCM
|
Requested air mass per combustion
|
|
Text message
|
Check fuel filler cap
|
SID
|
EVAP diagnosis OBDII
|
|
Sound
|
Acoustical information
|
SID
|
In connection with text message
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact.
|
TCM
| TCM transmits | Values | Used by | The value depends on the following sensor input, signal or function |
|
Selector lever position
|
P, R, N, D, 3, 2, 1
|
MIU, Trionic
|
Selector lever position sensor
|
|
CHECK GEARBOX lamp
|
ON/OFF
|
MIU
|
Internal diagnosis
|
|
SPORT
|
ON/OFF
|
MIU, Trionic
|
Button and oil temperature sensor, not Limp-Home or WINTER
|
|
WINTER lamp
|
ON/OFF
|
MIU
|
Button and oil temperature sensors, not Limp-Home
|
|
Maximum permitted engine torque
|
Nm
|
Trionic
|
Gear-changing function
|
|
Text message
|
Text information
|
SID
|
Oil temperature sensor
|
|
Diagnostics communication
|
Response to query from diagnostic tool
|
DICE/diagnostic tool
|
Control module should be live and the bus leads intact.
|
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