PTC Heater Circuit [10/2014 - ]: Description
The air conditioning amplifier assembly sends operation signals to the PTC HTR relays when quick heater assembly operation conditions are met. Based on the signals from the air conditioning amplifier assembly, the PTC HTR relays turn on, and power is supplied to the quick heater assembly installed in the air conditioning radiator assembly.
QUICK HEATER ASSEMBLY OPERATION CONDITION
| Control ECU | Condition |
|---|---|
| Air Conditioning Amplifier Assembly | Power switch on (READY) |
| Blower motor on | |
| Temperature set to MAX HOT | |
| Combination switch assembly (ECO switch) off | |
| IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected) |
|
| Engine coolant temperature 70°C or lower | |
| Ambient temperature 10°C or lower |