INSPECTION PROCEDURE 5: Auto-cruise Control cannot be Set.: Comment
WARNING: This page is about a different variant/trim than selected.
The fail-safe function is probably canceling auto-cruise control. In this case, scan tool MB991958 can be used to Retest each system by checking the diagnostic trouble codes. The scan tool can also be used to check if the circuits of each input switch are normal or not by checking the input switch codes.