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Bus communication

Bus communication

Bus communication, Trionic T7



Control module, ACC (216)

Connection, CD changer (355hb)

Control module, airbag/SRS (331)

Radio (353)

CD changer (355)

Control module PSM (357Dk)

Control module, Trionic T7 (430b)

Transmission control module, TCM (502b)

MIU (540d)

SID (541)

Control module (ABS) 547

Control module STC (565)

Control module, Trionic T7 OBDII (589b)

Control module, DICE (628)

Control module, TWICE (632)

TC/ABS (382)


Bus communication, diesel EDC 15



Control module, ACC (216)

Connection, CD changer (355hb)

Control module, airbag/SRS (331)

Radio (353)

CD changer (355)

Control module PSM (357Dk)

MIU (540c)

SID (541)

Control module (ABS) 547

Control module, EDC 15 (595)

Control module, auxiliary heater (597)

Diesel pump (598)

Control module, DICE (628)

Control module, TWICE (632)


Bus communication, diesel PSG 16




Control module, ACC (216)

Connection, CD changer (355hb)

Control module, airbag/SRS (331)

Radio (353)

CD changer (355)

Control module PSM (357Dk)

MIU (540c)

SID (541)

Control module (ABS) 547

Fuel pump with PSG 16 control module (595)

Control module, auxiliary heater (597)

Control module, DICE (628)

Control module, TWICE (632)


P-bus and I-bus



A bus is a number of wires on which information is sent digitally and serially. Digital means that the voltage difference between two wires has only two values, about 0V or 5V. The information is coded so that different combinations of pulses with values 0V and 5V have different meanings.

Serial means that the information is sent in ”packets” one after the other in rapid succession.

The bus is divided into the P-bus (Powertrain Bus) and the I-bus (Instrument Bus). Both buses are connected to the main instrument unit (MIU). The buses are electrically isolated from each other.

As in the 9-5, the Airbag and ABS control modules have no bus connections.

The diagnostics instrument is not directly connected to the bus but communicates via DICE, which is connected to the I-bus, and therefore has access to all the control modules connected to the bus.

The P-bus has a data transfer rate ten times higher than that of the I-bus. This is because the P-bus requires information with the least possible delay.

All the information sent from one control module is accessible for all the other control modules on the bus. The MIU is responsible for making information on one bus available to the other bus.

The control modules send out information on the bus at regular intervals. The time between two transmissions depends on the information being transmitted and varies between 10 milliseconds (0.010 seconds) and one second. Information is also transmitted by the control module whenever the information changes.

Transmission of information between control modules occurs on two leads, bus+ (green lead) and bus- (white lead). The leads are twisted to increase tolerance to electrical interference.

DICE uses the following information

Information

Values

From

The value depends on the following sensor input, signal or function

LH rear lights

ON/OFF

TWICE

Control module input supplied with current from lights switch

DICE uses the information for the instrument lighting, acoustic warning and rear fog lights.



RH rear lights

ON/OFF

TWICE

Control module input supplied with current from lights switch

DICE uses the information for the instrument lighting, acoustic warning and rear fog lights.



Driver's door

OPEN/CLOSED

TWICE

Door switch

DICE uses the information to turn on or off the interior lighting, for the visual warning and for the “Follow me home” function.



Passenger door

OPEN/CLOSED

TWICE

Door switch

DICE uses the information to turn on or off the interior lighting, for the visual warning and for the “Follow me home” function.



Rear door, Left

OPEN/CLOSED

TWICE

Door switch

DICE uses the information to turn on and off the interior lighting.



Rear door, Right

OPEN/CLOSED

TWICE

Door switch

DICE uses the information to turn on and off the interior lighting.



Boot lid

OPEN/CLOSED

TWICE

Lid switch

DICE uses the information to turn on and off the luggage compartment lighting.



Hazard flashers

ON/OFF

TWICE

Anti-theft alarm function and central locking system function

DICE uses the information to activate and deactivate the hazard flashers for the car's anti-theft alarm.



Central locking system

UNLOCKED/LOCKED

TWICE

Central locking system function

DICE uses the information to turn off/on the interior lighting.



A/C

ON/OFF

ACC

AUTO selected and outside temperature (bus from SID)

DICE uses the information to activate and deactivate the car's radiator fan and A/C systems.



Rear Window Heater

ON/OFF

ACC

Button on dashboard

DICE uses the information to activate and deactivate the heating.



Vehicle speed

km/h, mph

MIU

Rear left wheel speed (lead from ABS)

DICE uses the information for the intermittent windscreen wiper operation and for controlling the car's radiator fan and A/C systems.



Rheostat level

0-100 %

SID

Rheostat control module input

DICE uses the information to control the brightness of the instrument and control lighting.



Rheostat Night Panel

0-100 %

SID

Rheostat control module input reduced internally by a fixed value

DICE uses the information to control the brightness of the buttons when NIGHT PANEL is active.



Night Panel

ON/OFF

SID

Button

DICE uses the information on whether NIGHT PANEL is activated or deactivated.



Display lighting

0-100 %

SID

Rheostat control module input or light sensor, highest value

DICE uses the information to control the brightness of the display.



Outside temperature

°C

SID

Outside temperature sensor, control module adjustment

DICE uses the information to control the car's radiator fan and A/C systems.



Engine Running

ON/OFF

EDC 15, PSG 16, T7

Crankshaft position sensor

DICE uses the information to control the car's radiator fan and A/C systems.



Coolant temperature

-50 - 200°C

EDC 15, PSG 16, T7

Coolant temperature sensor

DICE uses the information to control the radiator fan and A/C systems.

Wheel speed RL

0 - 300 km/h

TC/ABS

Wheel speed sensor RL



Diagnostics



Tech 2

Control module should be live and the bus leads intact.

See Bus and diagnostic communication





DICE sends the following information

Information

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.

Trionic EDC 15 and PSG 16 use this information to control the relays.



A/C Pressure

0-30 bar

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



A/C pressure sensor

EDC 15/PSG 16 and T7 use this information for load compensation.



Current consumption

0-255 A

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



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

Trionic uses the information for load compensation.



Position lights

ON/OFF

SID

Control module activation of the relay output for the headlamp relay

SID uses the information for the instrument lighting functions.



Electrically heated rear window

ON/OFF

ACC

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

ACC uses the information to confirm that the rear window heating is active.



Rear fog light defective

YES/NO

SID

Control module current measurement of output to lamp

SID uses the information to display a CHECK message.



Left Direction Indicator

ON/OFF

MIU,

SID

Control module activation of output to lamps

MIU uses the information to indicate activated LH direction indicators with the control lamp on the main instrument unit

SID uses the information for acoustic indication of activated direction indicators “tick-tock”.



Right Direction Indicator

ON/OFF

MIU,

SID

Control module activation of output to lamps

MIU uses the information to indicate activated RH direction indicators with the control lamp on the main instrument unit.

SID uses the information for acoustic indication of activated direction indicators “tick-tock”.



Rear Fog Light

ON/OFF

MIU

Control module activation of output to fog light

MIU uses the information to turn on/off the rear fog light indicator on the main instrument unit.



Sound

Acoustic information

SID

Control module programming and seat-belt buckle switches, driver's door or passenger's door open (bus from TWICE)

SID uses the information to generate acoustic warnings.

Ignition +B

ON/OFF

Audio, TWICE

Ignition switch

Informs Audio and TWICE of the position of the ignition switch.



Ignition +15

ON/OFF

-

Ignition switch

Informs TWICE of the position of the ignition switch.



Ignition +54

ON/OFF

TWICE

Ignition switch

Informs TWICE of the position of the ignition switch.



Ignition +50

ON/OFF

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

+15 present but not +54

Informs TWICE and ACC of the position of the ignition switch.



Idling speed increase

ON/OFF

T7

Radiator fan High has been activated once during the trip.



Reverse gear

ON/OFF

T7

Reversing lights switch



Diagnostics



Tech 2

Control module should be live and the bus leads intact.

See Bus and diagnostic communication