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DIAGNOSIS TSB Revision KEYLESS OPERATION SYSTEM (KOS) 42B-103 STEP 1. Using scan tool MB991958, read the diagnostic CAUTION To prevent damage to scan tool MB991958, always turn the scan tool (M.U.T.-III) (2) Turn the ignition switch to the "ON" position. YES : Diagnose the KOS-ECU. Refer to . NO : Go to Step 2. STEP 2. Check KOS-ECU connector C-05 for loose, YES : Go to Step 3. to GROUP 00E, Harness Connector Inspection . Check that the inside and outside antenna works normally. AC608435 Data link connector MB991827 MB991824 MB991910 AB |