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STEP 1. Using scan tool MB991958, diagnose the CAN bus ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector To prevent damage to scan tool (MB991958), always turn (1) Connect scan tool MB991958 to the data link connector. (2) Turn the ignition switch to the "ON" position. (3) Diagnose the CAN bus line. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to GROUP 54D, STEP 2. Check ETACS-ECU connector C-317 and WCM Q:Is ETACS-ECU connector C-317 and WCM connector C-29 in good condition? YES: Go to Step 3. NO: Repair the defective connector. STEP 3. Check the wiring harness between WCM connector ⦆ Check the power supply line for open circuit. Q:Is the wiring harness between WCM connector C-29 (terminal No. 9) and ETACS-ECU connector C-317 (terminal No. 5) in good condition? YES: Go to Step 4. NO: The wiring harness may be damaged or the connector (s) may have loose, corroded or damaged terminals, or STEP 4. Using scan tool MB991958, check data list. Item No. Item name Normal Item 254 IG voltage Battery WIRELESS CONTROL MODULE (WCM) 42C-27 DIAGNOSIS |