Fault(s) in convenience data bus system also displayed in another control unit |
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| Pay particular attention to the possibility of loose contacts in the wires and connectors. |
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| If this fault is not displayed for all connected control units, the problem may be an open circuit at a connection in the wiring. |
If no fault can be found and this fault is displayed for all control units linked to the convenience data bus system, the problem is in one of the connected control units. |
If the fault in the convenience data bus system is now no longer displayed, the problem is in one of the disconnected control units. |
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| Consecutively re-connect the various control units. |
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| Interrogate the fault memory after connecting each control unit. |
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| Replace the control unit following installation of which the fault is displayed again. |
If the fault in the convenience data bus system is still displayed, there is a problem with the control unit in dash panel insert -J285- or the steering column electronics control unit -J527-. |
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| Interrogate fault memory of control unit in dash panel insert -J285- again. |
Note The defective control unit can be established by disconnecting the steering column electronics control unit -J527- and connecting up a different control unit. |
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| Replace the defective control unit. |
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