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SYMPTOM PROCEDURES TSB Revision SIMPLIFIED WIRING SYSTEM (SWS) 54B-309 • The front-ECU may be defective • The wiring harness or connectors may have loose, corroded, or damaged terminals, or termi- DIAGNOSIS Required Special Tools: • MB991223: Harness Set • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: MUT-III USB Cable • MB991911: MUT-III Main Harness B • MB991813: SWS Monitor Kit • MB991806: SWS Monitor Cartridge • MB991812: SWS Monitor Harness (For Column-ECU) • MB991822: Probe Harness STEP 1. Use scan tool MB991958 to select "ECU COMM • Column-ECU • Front-ECU CAUTION To prevent damage to scan tool MB991958, always turn the monitor . (2) Turn the ignition switch to the "LOCK" (OFF) position. below to display "ECU COMM CHK." 1. Select "SYSTEM SELECT." (4) Scan tool MB991958 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the Q: Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menus? to Inspection Procedure A-2 "Communication with "NG" is displayed on the "FRONT ECU" menu : Refer to Inspection procedure A-4 "Communication with AC309091 MB991911 MB991827 MB991824 AB MB991806 MB991862 DATA LINK DATA LINK |