S6 V8-4.2L (BBD) (2004)
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Information Bus: Component Tests and General Diagnostics
CAN-Bus System, Checking
CAN-bus System, Checking
NOTE:
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If the connector is removed from one control module connected to the CAN-bus-Comfort and the ignition is switched on, a malfunction entry can
occur in another control module connected to the CAN-Bus. The same applies, if e.g. by pulling a fuse the voltage supply is interrupted.
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The Control module with indicator unit in instrument cluster -J285- is the decisive control module in the CAN-bus system, via the adaptation
control modules connected to the CAN-bus system are entered into this control module (-J285-) (depending on equipment level).
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Based on the wiring diagram on can determine how many control modules are connected to the CAN-bus system.
Isolating possible malfunction causes
NOTE:
The following malfunction locations and malfunction types apply for the CAN-bus system:
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Powertrain CAN-bus
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Faulty: No data can be transferred via the Bus- system. No data can be transferred on either one or both lines (CAN-Hi or CAN-Lo).
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Check DTC memory: Control module with indicator unit in instrument cluster -J285- cannot send information, due to a malfunction on a
control module connected to the CAN-bus system (Check DTC memory of instrument cluster control module).
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Missing messages (time out for various control modules): No data was received by one or more control modules within a specified time period.
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Control module with indicator unit in instrument cluster -J285-
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No communication. No data received from Control module with indicator unit in instrument cluster -J285-.
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Check DTC memory: Control module with indicator unit in instrument cluster -J285- cannot send information due to malfunction on an
component connected in series.
Determine malfunction in CAN-bus system
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With ignition switched off, connect VAS 5051 Vehicle Diagnostic, Testing and Information System with diagnostic cable VAS 5051/1 to 16-pin
diagnostic connector on vehicle. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks" under "Heating and Air Conditioning",
See: Heating and Air Conditioning/Testing and Inspection
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Switch ignition on.
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Press button -0- twice for function "Automatic test procedure".
Indicated on display of VAS 5051:
All address words stored in VAS 5051 are sent to the vehicle one after another via the diagnostic cable.
Indicated on display of VAS 5051:
