SSP_307_d2.pdf

Data bus diagnosis interface

The data bus diagnosis interface J533

Description

Due to the high level of network functions, a

great deal of data is transferred. To assure the

effective exchange of data, several data bus

systems are necessary that transfer data between

each other.

The data bus diagnosis interface connects these

data buses together as a gateway interface and

makes data transfer possible. This function that

was perviously integrated in the dash panel

insert or onboard power supply control unit, is

now an independent control unit.

Data transfer

data bus diagnosis interface

Diagnosis CAN

data bus

Dash panel insert

CAN data bus

Diagnosis connection

Drive train

CAN data bus

Convenience

CAN data bus

Fitting location

The data bus diagnosis interface can be found

on the left next to the dash panel above the fuse

box.

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Dash panel insert

Infotainment

CAN bus

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data bus diagnosis interface

Master functions

The data bus diagnosis interface J533 manages the master functions for terminal 15 run-on on the drive

train CAN data bus and control of the sleep and wake-up modes for the data bus systems.

Terminal 15 run-on

Certain control units in the CAN data bus need

to exchange information even when terminal 15

is off. For this reason, a message is sent to the

CAN data bus for actuation of the run-on mode.

The control units make a connection from termi-

nal 30 to terminal 15 internally, which allows

them to communicate further. In this way, the

power steering control unit J500, for example,

can communicate with the other control units.

The run-on mode can last between ten seconds

and fifteen minutes. The run-on period depends

on the data that is to be sent.

To finish the run-on period, the data bus diagno-

sis interface initiates the sleep command.

Control units that participate in terminal 15

run-on

J533

Drive train CAN data bus

Te r m . 3 0

J271

J500

J220

G85

J587

Internally switched terminal 15

J217

J104

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Key

G85 Steering angle sender

J104 ABS with EDL control unit

J217 Automatic gearbox control unit

J220 Motronic control unit

J271 Motronic power supply relay

J500 Power steering control unit

J587 Selector lever sensors control unit

J533 data bus diagnosis interface

Sleep and wake-up modes of the

data bus systems

When all of the control units of the convenience

and infotainment CAN data bus have

announced their readiness for stand-by, a con-

trol unit will give the signal to 'sleep'. The voltage

level of the low signal is 12 V and 0 V for the

high signal.

Furthermore, it also gives the wake-up signal

when the data bus has to be activated, for

example, when the doors are unlocked.

The data bus diagnosis interface monitors the

sleep function.

If the drive train CAN data bus does not go into

sleep mode, the convenience and infotainment

CAN data buses do not go into sleep mode

either.

If the convenience CAN data bus does not go

into sleep mode, the infotainment CAN data bus

does not go into sleep mode either.

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Sleep mode

Wake -up s i gn a l

Wa k e - u p m o d e

Onboard power supply control unit

The onboard power supply control

unit J519

Fitting location

The onboard power supply control unit can be

found underneath the dash panel where it forms

a unit with the relay carrier.

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Va r ia n ts

The onboard power supply control unit is availa-

ble on the Midline and Highline variants.

The Highline variant is installed in vehicles with

fog lamps and/or Xenon lights.

All other vehicles are installed with the

Midline variant.

Retrofitting of fog lamps is only possible when

the onboard power supply control unit of the

Midline variant is exchanged with the onboard

power supply control unit of the Highline variant.

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Onboard power supply

control unit

Relay carrier on onboard

power supply control unit

The following figures are approximate

and may differ depending on country

variations and software.

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