On-Board Diagnostics

DIAGNOSTIC FUNCTION

ON-BOARD DIAGNOSTICS

If an error occurs in the ECU or the SWS or CAN communication line which performs the SWS or CAN communication, the DTC is memorized in ETACS-ECU. The DTCs have 16 items. The DTCs are checked to connect scan tool MB991958 (M.U.T.-III sub assembly). The memorized DTCs are not erased even if the ignition switch is turned to the "LOCK" (OFF) position. The DTCs are erased to operate scan tool MB991958 (M.U.T.-III sub assembly).
NOTE:
*1: For vehicles that do not have a sunroof, the diagnosis code is always sent but it does not indicate a problem.

NOTE:
*2: The diagnostic trouble code is always set, but it does not indicate a problem.

NOTE:
*3: The diagnosis code for a past problem is not sent.