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MANUAL A/C DIAGNOSIS TSB Revision HEATER, AIR CONDITIONING AND VENTILATION 55A-55 NOTE: For a past trouble, you cannot find it by − How to Cope with Intermit- tent Malfunctions ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, . TROUBLESHOOTING HINTS • Malfunction of the WCM-ECU • Malfunction of the A/C-ECU • Damaged harness wires and connectors DIAGNOSIS Required Special Tools: • MB991223: Harness Set • MB992006: Extra Fine Probe • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: V.C.I. • MB991827: M.U.T.-III USB Cable • MB991910: M.U.T.-III Main Harness A STEP 1. Using scan tool MB991958, diagnose the CAN bus 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 : Go to Step 2. ). ZC501967 AC404789 AC701411AB MB991824 MB991827 MB991910 Data link |