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TROUBLESHOOTING HEATER, AIR CONDITIONER AND VENTILATION 55A-17 Code No. B1018: Temperature control dial SW error <Vehicles without A/C> Heater Control Panel Circuit HEATER HEATER CPU INTERFACE Wire colour code ACA00851 AC612706 Connectors: C-60, C-147 <LHD> BP C-60 (B) C-147 COMMENTS ON TROUBLE SYMPTOM PROBABLE CAUSES • Malfunction of the heater control panel • Damaged wiring harness or connectors • Malfunction of the heater control unit DIAGNOSIS PROCEDURE STEP 1. Connector check: C-147 heater control Q: Is the check result normal? YES : Go to Step 2. NO : Repair the connector. STEP 2. Check the wiring harness between C-147 • Check the heater control panel signal line for open or short circuit. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the wiring harness. STEP 3. Check whether the diagnosis code is Q: Is the diagnosis code set? YES : Replace the heater control unit. NO : The trouble can be an intermittent |