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Q:Does scan tool MB991958 display the items "Head light LO ON duty", "IG voltage" and "Dr door ajar switch" as normal condition? YES<Normal conditions are displayed for all items.>: Go to Step 4. NO<Normal condition is not displayed for item No. Troubleshoot the ETACS-ECU.Refer to GROUP 54Ad, Diagnosis - Inspection Procedure 2 "ETACS-ECU does not NO<Normal condition is not displayed for item No. Troubleshoot the ETACS-ECU.Refer to GROUP 54Ad, Diagnosis - Inspection Procedure 2 "ETACS-ECU does not NO<Normal condition is not displayed for item No. Troubleshoot the ETACS-ECU.Refer to GROUP 54Ad, Diagnosis - Inspection Procedure 5 "ETACS-ECU does not STEP 4. Retest the system Q:Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/ NO: Replace the ETACS-ECU. Inspection Procedure 8: Daytime running light function does not work normally. M15410900196USA0000010000 Whenever the ECU is replaced, ensure that the TECHNICAL DESCRIPTION (COMMENT) ETACS-ECU or the input signal circuit may be TROUBLESHOOTING HINTS ⦆ Trouble in input signal system ⦆ Malfunction of the ETACS-ECU ⦆ Damaged harness wires and connectors DIAGNOSIS Required Special Tools: ⦆ MB991223: Harness Set ⦆ MB992006: Extra Fine Probe ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: V.C.I. LIGHTING 54Ac-45 DIAGNOSIS |