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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

EDC 15, PSG 16 (Cars with D223) T7 (Cars with B205, B235)

A/C (bus from ACC), coolant temperature (bus from T7/EDC 15/PSG 16), A/C pressure and evaporator temperature.

A/C pressure

0 -30 bar

EDC 15, PSG 16 (Cars with D223) T7 (Cars with B205, B235)

A/C pressure sensor

Current consumption

0-255 A

Cars with B205, B235

Control module activation of the relay outputs for the radiator fans and the electrically heated rear window

Position lights

ON/OFF

SID

Control module activation of the relay outputs for the headlamp relay

Electrically heated rear window

ON/OFF

ACC

Control module activation of the relay output for the electrically heated rear window

Rear fog light broken

YES/NO

SID

Control module current measurement of output to lamp

LH direction indicators

ON/OFF

MIU, SID

Control module activation of output to lamps

RH direction indicators

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

Sound

Sound 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

--

Ignition switch

Ignition +54

ON/OFF

TWICE

Ignition switch

Ignition +50

ON/OFF

TWICE, ACC, T7(Cars with B205, B235)

+15 present but not +54

VIN

Vehicle Identification Number

Audio

Control module programming

Idling speed increase

ON/OFF

Trionic T7

Radiator fan High has been activated once during the trip.

Reverse gear

ON/OFF

Trionic T7

Reversing light switch

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact



TWICE

LH rear light broken

YES/NO

SID

Control module current measurement of output to lamps

RH rear light broken

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 broken

YES/NO

SID

Control module current measurement of output to lamp

RH brake light broken

YES/NO

SID

Control module current measurement of output to lamp

High-level brake light broken

YES/NO

SID

Control module current measurement of output to lamp

Brake lights

ON/OFF

SID, TCM (cars with Trionic T7 engine management system)

Brake light switch

Sound

Sound information

SID

In connection with text message

Driver's door

OPEN/CLOSED

MIU,PSM

DICE

Door switch

Passenger door

OPEN/CLOSED

MIU,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, DICE, STC

Lid 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, MIU

Control module programming

Key correct

ON/OFF

Audio, Trionic

Immobilizer function

Immobilizer

ON/OFF

Trionic

Immobilizer function

Central locking system

UNLOCKED/LOCKED

DICE

Central locking system function

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact





ACC

Text message

Text information

SID

Extended user programming, demonstration of air balance function

Sound

Sound 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

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact





Audio system, main unit

Time RDS

Hours, Minutes, Seconds

SID

RDS reception

Date RDS

0 -31

SID

RDS reception

Month RDS

January...December

SID

RDS reception

Sound

Sound information

SID

Button pressed on dashboard

Text message

Text information

SID

Audio display

CD changer control

Information for controlling the CD changer

CD changer

Buttons on dashboard

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact





CDC

CD changer information

Current settings

Audio

Information on a CD and its location

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact







MIU

Vehicle speed

km/h, mph

DICE, SID, ACC, Audio, TWICE, STC, Trionic T7 (Cars with B205, B235)

Wheel speed rear right (wire from ABS, bus from TC/ABS)

Sound

Sound information

SID

Control module activation of central warning lamp or info display lamp

Stop for fuel (cars with engine management system EDC 15/PSG 16)

ON/OFF

SID

When fuel level drops below 3 litres, ON is sent

Fuel consumed since start

0-65535 ml

SID

Bus from EDC 15, PSG 16 or Trionic T7. The reading is corrected by an adjustment factor in the MIU. The factor can be adjusted with the diagnostic tool.

Fuel level

litres

SID, ACC, Trionic T7

Tank sensor, control module adjustment

Odometer reading

km, miles

SID

Display value

Identification number

--

TWICE

Value created in MIU when immobilizer code is programmed in TWICE

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact



SID

Info Disp Lamp

ON/OFF

MIU

In connection with text message

Unit

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 level

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

SID buttons

Clear, Set, Trip Down, Trip Up, Night Panel

TWICE, MIU

Buttons

Display lighting

0 -100 %

Audio, ACC, 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, DICE, TWICE

Outside temperature sensor, control module adjustment

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact



STC

Used by
Sound

Sound information

SID

On text message and when the roof has finished it cycle

Text message

Text information

SID

On fault

Soft top position

Raised, in motion, lowered

ACC, TWICE

Switches on top of windscreen frame, Soft top cover switch.

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact





PSM

Used by
Sound

Sound information

SID

When seat setting stored

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact





EDC 15

Check Engine lamp

ON/OFF

MIU

Internal diagnosis

CRUISE lamp

ON/OFF

MIU

Cruise Control function

Fuel consumed since start

0-65535 ml

MIU

Fuel injection function

Engine has started

ON/OFF

ACC, DICE, SID

Crankshaft position sensor

Engine speed

0-6000 rpm

MIU, ACC, Diesel pump

Crankshaft position sensor

Coolant temperature

-50 -200°C

MIU, DICE, ACC

Coolant temperature sensor

Glow indicator lamp

ON/OFF

MIU

Glow function

Fuel mass / combustion requested

0-100 mg/c

Diesel pump

Fuel injection function

Start of pressure accumulation Requested (Crankshaft degrees)

-10 - 40 degrees

Diesel pump

Fuel injection function

Start of pressure accumulation Requested (Pumpshaft degrees)

0 - 20 degrees

Diesel pump

Fuel injection function

Immobilizer

Code

TWICE

Immobilizer function

Diagnostics communication

Answer to enquiry from diagnostics instrument

Tech 2

Control module should be live and the bus leads intact





Diesel pump

Pump rpm

0-3000 rpm

EDC 15

Pumpshaft sensor

Latest injection duration (Pumpshaft degrees)

0 - 90 degrees

EDC 15

The time during which the pump control module has kept the needle valve for flow control closed at the latest injection

Fuel temperature

-50 -200°C

EDC 15

Fuel temperature sensor



PSG 16

Check Engine lamp

ON/OFF

MIU

Internal diagnosis

CRUISE lamp

ON/OFF

MIU

Cruise Control function

Fuel consumed since start

0-65535 ml

MIU

Fuel injection function

Engine has started

ON/OFF

ACC, DICE, SID

Crankshaft position sensor

Engine speed

0-6000 rpm

MIU, ACC

Crankshaft position sensor

Coolant temperature

-50 -200°C

MIU, DICE, ACC

Coolant temperature sensor

Glow indicator lamp

ON/OFF

MIU

Glow function

Oil level

Low

SID

Oil level sensor

Immobilizer

Code

TWICE

Immobilizer function

Diagnostics communication

Answer to enquiry from diagnostics instrument

Tech 2

Control module should be live and the bus leads intact





Trionic T7

Trionic T7 transmits Values Used by The value depends on the following sensor input, signal or function
Check Engine lamp

ON/OFF

MIU

Internal diagnosis

Kick Down

ON/OFF

TCM, TC/ABS

Pedal position sensor 1

Shift Up Lamp (US/CA only)

ON/OFF

MIU

Wheel speed front right (lead from ABS)

CRUISE lamp

ON/OFF

MIU

Cruise Control function

TURBO gauge

0-255, no unit

MIU

Current air mass per combustion

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 torque

-100-400 Nm

TCM, TC/ABS

Mass air flow sensor

Engine speed

0-7000 rpm

MIU, ACC

Crankshaft position sensor

Accelerator Pedal Position

0-100%

TCM, TC/ABS

Requested air mass per combustion

Coolant temperature

-40 - 215°C

MIU, DICE, ACC

Coolant temperature sensor

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact



TCM (cars with Trionic T7 engine management system)

TCM sends 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

The button and oil temperature sensor and not limp-home or WINTER

WINTER Lamp

ON/OFF

MIU

The button and oil temperature sensor and not limp-home

Maximum Permitted Engine Torque

Nm

Trionic

Shift function

Text message

Text information

SID

Oil temperature

Diagnostics communication

Answer to enquiry from diagnostics instrument

DICE/diagnostic tool

Control module should be live and the bus leads intact



TC/ABS

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

0-300 km/h

Trionic

Wheel speed sensor FR

Wheel speed FL

0-300 km/h

Not used

Wheel speed sensor FL

Wheel speed RL

0-300 km/h

Trionic, MIU, DICE, Audio, TWICE

Wheel speed sensor RL

Wheel speed RR

0-300 km/h

MIU

Wheel speed sensor RR

ABS lamp

ON/OFF

MIU

Internal diagnostics

TCS OFF lamp

ON/OFF

MIU

Switch, internal diagnostics

TCS lamp

ON/OFF

MIU

Traction Control active

Request for engine torque

-100 - 400 Nm

Trionic

Traction Control