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Past trouble ⦆ If DTC B1000 is stored as a past trouble, carry out TROUBLESHOOTING HINT ⦆ Malfunction of connector. ⦆ Malfunction of the harness. ⦆ Malfunction of the A/C control panel. ⦆ Malfunction of the A/C-ECU. DIAGNOSIS Required Special Tool: ⦆ 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 (Vehicles with STEP 1. Using scan tool MB991958, diagnose the CAN bus ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector Use scan tool MB991958 to diagnose the CAN bus lines. (1) Connect scan tool MB991958 to the data link connector. (2) Turn the ignition switch to "ON" position. (3) Diagnose the CAN bus line. Q:Is the check result satisfactory? YES: Go to Step 2. NO: Repair the CAN bus lines. Repair the CAN bus lines (Refer to GROUP 54D, Diagnosis-Can Bus Diagnostic STEP 2. Recheck for diagnostic trouble code. (1) Erase the DTC. (2) Turn the ignition switch to "ON" position. (3) Check if the DTC is set. Q:Is the check result satisfactory? YES: It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use NO: Go to Step 3. AIR CONDITIONING 55A-11 MANUAL A/C DIAGNOSIS |