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STEP 1. ETACS-ECU coding data check. ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector To prevent damage to scan tool MB991958, always turn the (1) Connect scan tool MB991958. Refer to "How to connect the (2) Turn the ignition switch to the "ON" position. (3) Read out the option coding information in ETACS-ECU. (4) Check that the "Front fog light" is set to "YES." (5) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the ETACS-ECU coding data normal? YES: Go to Step 2. NO: Operate scan tool MB991958 to set the option coding "Front fog light" to "Yes," and check the trouble symptom. STEP 2. Check that the tail/stop lights and headlights Q:Do the tail/stop lights and headlights operate normally? YES: Go to Step 3. NO: Check the tail/stop lights and the headlights (Refer to trouble symptom chart P.54Ac-114). STEP 3. Using scan tool MB991958, read the other system (1) Turn the ignition switch to the "ON" position. (2) Check whether the ETACS-ECU related DTC is set. (3) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the DTC set? YES: Troubleshoot the ETACS-ECU (Refer to GROUP 54Ad, NO: Go to Step 4. STEP 4. Using scan tool MB991958, check data list. ⦆ Turn the ignition switch to the "ACC" position. ⦆ Turn the fog light switch to ON. Item No. Item name Normal Item 212 Front fog light ON Q:Does scan tool MB991958 display the items "Front fog light" as normal condition? LIGHTING 54Ac-117 DIAGNOSIS |