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DEFROSTER DOOR MOTOR CIRCUIT HAC-207 < DTC/CIRCUIT DIAGNOSIS > [MANUAL A/C (TYPE 2)] C D E F G H J K L M A B HAC N O P DEFROSTER DOOR MOTOR CIRCUIT System Description INFOID:0000000006164822 SYSTEM DESCRIPTION Component Parts Defroster door control system components are: • Front air control • Defroster door motor • PBR (Built into defroster door motor) • Intake sensor System Operation The front air control determines defroster door position based on the position of the defroster switch. When the defroster switch is depressed, the defroster door motor rotates directing air to the defroster ducts. When any mode other than defroster is selected, the defroster motor rotates in the opposite direction closing off air flow to the defroster ducts. COMPONENT DESCRIPTION Defroster door motor The defroster door motor is attached to the front heater & cooling unit assembly. The front air control sends a voltage to rotate to the defroster door directing the air flow either to the defroster ducts, or to the floor ducts, depending on which way the voltage and ground are applied to the motor leads. Motor rotation is conveyed to a lever which activates the defroster door. Defroster Door Motor Component Function Check INFOID:0000000006164823 INSPECTION FLOW 1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DEFROSTER DOOR 1. Select vent ( ) mode. 2. Rotate mode control dial to defrost mode ( ). 3. Listen for defroster door position change (blower sound should change slightly). YES >> Inspection End. NO >> Go to diagnosis procedure. Refer to HAC-207, "Defroster Door Motor Diagnosis Procedure" . Defroster Door Motor Diagnosis Procedure INFOID:0000000006164824 Regarding Wiring Diagram information, refer to HAC-232, "Wiring Diagram - Manual With 3 Control Dial Sys- SYMPTOM: • Defroster door does not change. • Defroster door motor does not operate normally. 1. CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND WJIA0592E |