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Messages

Messages

Below is a summary of the messages which are sent out by all the systems in the car 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, SPA

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 must be live and the bus leads intact



TWICE

TWICE transmits Values Used by The value depends on the following sensor input, signal or function
Left Rear Light Faulty

YES/NO

SID

Control module current measurement of output to lamps

Right 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 light switch

RH rear light

ON/OFF

DICE

Control module input supplied with current from light switch

Left Brake Light Faulty

YES/NO

SID

Control module current measurement of output to lamp

Right 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

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

Body type

4D/5D

SPA

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 must 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

Extended 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 must 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 must 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 current CD and its location

Diagnostics communication

Response to query from diagnostic tool

DICE/diagnostic tool

Control module must 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 must 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, SPA

Wheel speed, Rear left (wire from ABS, bus from TC/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 must 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, SPA

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

Clear

ON/OFF

SPA

Button

Display lighting

0 - 100 %

Audio, ACC, DICE, MIU

Rheostat control module input or light sensor, highest value

Brightness in cabin

Lux

MIU

Light sensor

Engine Off Time

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 must 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 must 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, TC/ABS

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, TC/ABS

Crankshaft position sensor

Engine rpm

0-7000 rpm

MIU, TCM, ACC

Crankshaft position sensor

Engine torque

-100 - 400 Nm

TCM, TC/ABS

Mass air flow sensor

Coolant temperature

-40 - 215 °C

MIU, DICE, ACC

Coolant temperature sensor

Accelerator position

0 - 100 %

TCM, TC/ABS

Requested air mass per combustion

Diagnostics communication

Response to query from diagnostic tool

DICE/diagnostic tool

Control module must 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, TC/ABS

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

Vehicle speed, output speed

0-300 km/h

Trionic

Engine speed signal converted to vehicle speed.

The engine speed signal is transmitted by a sensor in the gearbox. The output speed is the same as the vehicle speed.

Text message

Text information

SID

Oil temperature sensor

Diagnostics communication

Response to query from diagnostic tool

DICE/diagnostic tool

Control module must be live and the bus leads intact



SPA

SPA transmits Values Used by The value depends on the following sensor input, signal or function
Text message

Text information

SID

Parking assistance, OFF, failure

Sound

Acoustical information

SID

In connection with text message

Diagnostics communication

Response to query from diagnostic tool

DICE/diagnostic tool

Control module must be live and the bus leads intact



TC/ABS

TC/ABS transmits Values Used by The value depends on the following sensor input, signal or function
FR wheel speed

0-300 km/h

Trionic

FR wheel speed sensor

FL wheel speed

0-300 km/h

Not used

FL wheel speed sensor

Wheel speed RL

0-300 km/h

Trionic, MIU, DICE, Audio, TWICE

RL wheel speed sensor

RR wheel speed

0-300 km/h

MIU

RR wheel speed sensor

ABS lamp

ON/OFF

MIU

Internal diagnosis

TCS OFF lamp

ON/OFF

MIU

Switch, internal diagnosis

TCS lamp

ON/OFF

MIU

Traction Control active

Engine torque request

-100 - 400 Nm

Trionic

Traction Control modulation