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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 the (1) Connect scan tool MB991958. Refer to "How to connect the (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. Using scan tool MB991958, check for any (1) Turn the ignition switch to the "ON" position. (2) Check whether the KOS or WCM related DTC is set. (3) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the DTC set? YES<vehicles with KOS>: Troubleshoot the KOS (Refer to YES<vehicles with WCM>: Troubleshoot the WCM (Refer to NO: Go to Step 3. STEP 3. Check the keyless operaton key <KOS> or keyless Q:is the keyless operaton key <KOS> or keyless entry transmitter <WCM> normally? YES: Go to Step 4. NO<vehicles with KOS>: Troubleshoot the KOS (Refer to NO<vehicles with WCM>: Troubleshoot the WCM (Refer to STEP 4. Using scan tool MB991958, Check the configuration (1) Turn the ignition switch to the "ON" position. (2) Use the ETACS-ECU configuration function to check that the (3) Turn the ignition switch to the "LOCK" (OFF) position. ALARM SYSTEM 54Af-9 DIAGNOSIS |