Test Installation Of A New Instrument Cluster

The VINs in the instrument cluster and CAS control unit do not match or the VIN has not yet been entered in the instrument cluster.

A bidirectional communication between the instrument cluster and the CAS control unit takes place as follows:

• The kilometer reading stored in the CAS control unit, for example, is transferred to the working memory of the total distance recorder in the instrument cluster and then displayed. During a test drive, the kilometers covered continue to be metered in the working memory of the total distance recorder and are sent to the CAS control unit every 10 km.
• If at least 24 hours have elapsed between terminal 15 being switched off and on, calibration will be repeatedly automatically regardless of the distance covered.
• When the instrument cluster is removed following a test drive the working memory loses the kilometer reading stored. The instrument cluster is reset to the initial status.

The vehicle identification number entered in a used instrument cluster can be overwritten until a distance of 254 km has been covered. It is then impossible to reset the permanently stored value.