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STEP 3. Using scan tool MB991958, Check whether the 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 scan (2) Turn the ignition switch to the "ON" position. (3) Erase the DTC. (4) Turn the ignition switch from "LOCK" (OFF) position to "ON" (5) Check if DTC is set. Q:Is DTC 31 set? YES: Go to Step 4. NO: The trouble, such as a poor connector connection from the headlight leveling unit (LH) to headlight automatic STEP 4. Check headlight leveling unit (RH) connector Q:Is headlight leveling unit (RH) connector A-56,headlight automatic leveling-ECU connector C-110 in good condition? YES: Go to Step 5. NO: Repair the defective connector. STEP 5. Check the wiring harness between headlight Q:Is wiring harness between headlight leveling unit (RH) connector A-56 (terminal No. 10) and headlight automatic leveling-ECU connector C-110 (terminal No. 12) in good condition? YES: Go to Step 6. NO: Repair the wiring harness. STEP 6. Using scan tool MB991958, Check whether the (1) Turn the ignition switch to the "ON" position. (2) Erase the DTC. (3) Turn the ignition switch from "LOCK" (OFF) position to "ON" (4) Check if DTC is set. Q:Is DTC 31 set? LIGHTING 54Ac-77 DIAGNOSIS |