| One must differentiate between two types of all-wheel drive control unit -J492-: |
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| To end of 04.99 not all control units are capable of diagnosis. In the event of customer complaints concerning these vehicles, a complete electrical test must be carried out → Chapter. |
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| From 05.99 all control units are capable of diagnosis. This new control unit generation can be identified only by the part number of the control unit. In the event of customer complaints, perform „guided fault finding“ with vehicle diagnosis, testing and information system -VAS 5051-. |
| Special tools and workshop equipment required |
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