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HAC-42 < DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER] BLOWER MOTOR CONTROL SYSTEM Blower Speed Compensation - Sunload When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower operates at low speed. During high sunload conditions, the A/C auto amp. causes the blower speed to increase. Blower Speed Control Specification COMPONENT DESCRIPTION Variable Blower Control The variable blower control is located on the cooling unit. The vari- able blower control receives a gate voltage from the A/C auto amp. to steplessly maintain the blower motor voltage in the 0 to 5 volt range (approx.). Front Blower Motor Component Function Check INFOID:0000000007356363 INSPECTION FLOW 1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER MOTOR 1. Press the blower (+) switch. Blower should operate. 2. Press the blower (+) switch and continue checking blower speed and fan symbol until all speeds are checked. Is the inspection result normal? YES >> Inspection End. NO >> Go to diagnosis procedure. Refer to HAC-42, "Front Blower Motor Diagnosis Procedure" Front Blower Motor Diagnosis Procedure INFOID:0000000007356364 Regarding Wiring Diagram information, refer to HAC-95, "Wiring Diagram - Automatic" SYMPTOM: Blower motor operation is malfunctioning. DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR WJIA0441E WJIA1111E August 2012 2012 Pathfinder |