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MMCS TSB Revision CHASSIS ELECTRICAL 54A-413 STEP 7. Check the wiring harness between ETACS-ECU • Check the power supply lines (battery supply) for open cir- cuit and short circuit. NOTE: Also check intermediate connector C-108, C-106 for Q: Is the wiring harness between ETACS-ECU connector C-317 (terminal 1) and multivision display connector connector(s) may have loose, corroded or damaged STEP 8. Using scan tool MB991958, check data list. • Turn the ignition switch to the ACC position. OK: Normal condition is displayed. Q: Is the check result normal? YES : Go to Step 9. − Inspection Procedure 1 "The ignition switch (ACC) signal is not ." STEP 9. Check ETACS-ECU connector C-315 for loose, YES : Go to Step 10. to GROUP 00E, Harness Connector Inspection Item No. Item name Normal Item 288 ACC switch ON |