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TROUBLESHOOTING HEATER, AIR CONDITIONER AND VENTILATION 55-29 Code No.B1055 Motor drive system for rear air mix damper <vehicles with dual automatic A/C> COMMENTS ON TROUBLE SYMPTOM This code is set when the rear air mixing damper POSSIBLE CAUSES • Malfunction of the rear air mixing damper control motor and potentiometer • Malfunction of the automatic air conditioner control panel (A/C-ECU) • Damaged the wiring harness or connectors DIAGNOSIS Step 1. MUT-III actuator test Check that the following actuator test can be • Item 13: R.Air mix dumper motor: 0% • Item 14: R.Air mix dumper motor: 50% • Item 15: R.Air mix dumper motor: 100% Q: Is the check result normal? YES : Go to Step 5. NO : Go to Step 2. REAR AIR MIXING DAMPER CONTROL A/C-ECU Wire colour code Rear Air Mixing Damper Control Motor And Potentiometer Circuit |