| Localisation of possible cause of trouble |
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| The following fault locations and types of fault apply to the convenience data bus system: |
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| “Group convenience data bus” |
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| - Fault: Data cannot be transferred by way of the data bus system |
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| - In one-wire mode: Data cannot be transmitted on one of the two data bus wires (“CAN-Hi ” or “CAN-Lo”) |
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| - Missing messages (time out for several control units): No data received within the specified time period from one or more control units (control unit in dash panel insert -J285-, on-board supply control unit -J519-, steering column electronics control unit -J527- or convenience system central control unit -J393-) |
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| - No communication: No data received from control unit in dash panel insert -J285-, convenience system central control unit -J393-, on-board supply control unit -J519- and/or steering column electronics control unit -J527- |
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| - Read out fault memory: Control unit in dash panel insert -J285-, convenience system central control unit -J393-, on-board supply control unit -J519- or steering column electronics control unit -J527- cannot transmit information on account of a fault in an upstream component. |
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| - No communication: No data received from auxiliary heater control unit -J364- and/or convertible top operation control unit -J256- (prior to further fault-finding, check encoding of control unit in dash panel insert -J285- and operating and display unit, Climatronic control unit -J255- as well as installation of this optional extra) |
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| - Read out fault memory: Auxiliary heater control unit -J364- or convertible top operation control unit -J256- cannot transmit information on account of a fault in an upstream component |
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