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Past trouble ⦆ If DTC U0154 is stored as a past trouble, carry out NOTE: For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there Inspection Service Points - How to Cope with TROUBLESHOOTING HINTS ⦆ Malfunction of the Occupant classification-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 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 read the Occupant AIR CONDITIONING 55A-47 MANUAL A/C DIAGNOSIS |