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MANUAL A/C DIAGNOSIS TSB Revision HEATER, AIR CONDITIONING AND VENTILATION 55A-23 DTC B1021: Fan Dial SW Error . DTC SET CONDITION DTC B1021 will be set when the A/C-ECU cannot . TECHNICAL DESCRIPTION (COMMENT) Current trouble • The A/C-ECU, the A/C control panel, or connec- tor(s) or wiring between the two may be defec- Past trouble • If DTC B1021 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring . 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 CAN communication system) AC901231 A/C-ECU CPU A/C Control Panel Circuit INTERFACE A/C AC702208 Connector: C-109, C-119 C-119 C-109 (B) AE |