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HAC-248 < SYSTEM DESCRIPTION > [MANUAL HEATER ] SYSTEM • When PTC relay turns ON, power supply is supplied to PTC heater. Heating element is heated and air flow temperature is increased. Heating is available for a period of time until engine coolant temperature is • Idle up request signal is transmitted from BCM to ECM while PTC heater operates. Idle speed is increased, warming-up is facilitated, and battery electric power is obtained. • Electric power supplied to PTC heating element is subject to PTC relay control conditions. NOTE: ° C or less. PTC heater is OFF when ambient temperature is 12 ° C (53.6 ° F) or more. PTC heater is ON when battery voltage is 11.5 V or more. PTC heater is OFF when battery voltage is 11 V or less. PTC heater Operation PTC relay-1 PTC relay-2 PTC relay-3 Electric power (W) OFF OFF OFF OFF OFF Approx. 0 PTC heater-1 LOW ON OFF OFF Approx. 333 PTC heater-2 MID ON ON OFF Approx. 666 PTC heater-3 HI ON ON ON Approx. 999 |