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STEP 1. Using scan tool MB991958, read CAN bus the ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector To prevent damage to scan tool MB991958, always turn the (1) Connect scan tool MB991958. Refer to "How to connect scan (2) Turn the ignition switch to the "ON" position. (3) Check whether the CAN bus lines related DTC is set. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the DTC set? YES: Repair the CAN bus line (Refer to GROUP 54D, CAN bus NO: Go to Step 2. STEP 2. Using scan tool MB991958, read the diagnostic ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector To prevent damage to scan tool MB991958, always turn the (1) Connect scan tool MB991958. Refer to "How to connect scan (2) Turn the ignition switch to the "ON" position. (3) Check whether the KOS-ECU related DTC is set. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the DTC set? YES: Diagnose the KOS-ECU. Refer to P.42B-18. NO: Go to Step 3. STEP 3. Key reminder switch check (1) Disconnect the C-315 ETACS-ECU connector. (2) Measure the resistance at the harness-side connector with KEYLESS OPERATION SYSTEM (KOS) 42B-147 DIAGNOSIS |