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DIAGNOSIS Required Special Tools: ⦆ MB991223: Harness Set ⦆ MB992006: Extra Fine Probe ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: Vehicle Communication Interface (V.C.I.) ⦆ MB991827: M.U.T.-III USB Cable ⦆ MB991910: M.U.T.-III Main Harness A STEP1. Check whether AM or FM broadcast frequency is Q:Is AM or FM broadcast frequency received? YES: Go to Step 2. NO: Diagnose the radio <vehicles with radio and CD changer> or the audio visual navigation unit <vehicles STEP 2. 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 GROUP 54Ad, (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<vehicles with radio and CD changer>: Go to Step 3. YES<vehicles with MMCS>: Go to Step 6. NO<vehicles with radio and CD changer or MMCS>: Repair the CAN bus line. (Refer to GROUP 54D, STEP 3. Check satellite radio tuner connector C-111 and Q:Is satellite radio tuner connector C-111 or radio and CD changer connector C-14 in good condition? YES: Go to Step 4. AUDIO AND NAVIGATION SYSTEM 54B-137 DIAGNOSIS |