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DOME LIGHT TSB Revision CHASSIS ELECTRICAL 54A-301 STEP 3. Using scan tool MB991958, check data list. • Turn the ignition switch to the "LOCK" (OFF) position. • Open each door. Q: Does scan tool MB991958 display the items "IG voltage", "ACC switch", "As door ajar switch", "RR door Go to Step 4. NO <Normal condition is not displayed for item No. Procedure 2 "ETACS-ECU does not receive any . NO <Normal condition is not displayed for item No. Procedure 1 "ETACS-ECU does not receive any . NO <Normal condition is not displayed for item No. Procedure 5 "ETACS-ECU does not receive any NO <Normal condition is not displayed for item No. Procedure 6 "ETACS-ECU does not receive any NO <Normal condition is not displayed for item No. Procedure 7 "ETACS-ECU does not receive any . NO <Normal condition is not displayed for item No. Procedure 8 "ETACS-ECU does not receive any Item No. Item name Normal Item 254 IG voltage 1 V or less Item 288 ACC switch OFF Item 256 Dr door ajar switch Open Item 257 As door ajar switch Open Item 258 RR door ajar switch Open Item 259 RL door ajar switch Open |