Inspection Procedure 5: Cruise Control cannot be Set (No Response "COAST/SET" Switch and "ACC/RES" Switch is Pressed.): Comment

The fail-safe function is probably canceling cruise control system. In this case, checking the cruise control system, MFI system, shift lever system < TC-SST >, TC-SST system < TC-SST >, ASC system and CAN bus line system DTCs. The scan tool MB991958 can also be used to check if the circuits of each input switch are normal or not by checking the data list.
In addition, if the option coding data written into the ECM is not normal, the cruise control system does not work.

NOTE: Press the cruise control switches one by one securely. Otherwise, the cruise control system may not be started.