Component | Function | |
A/C amp. | A/C Amp. | |
BCM | BCM receives each signals, and controls PTC heater relay. | |
Combination meter | Combination meter transmits ambient temperature signal to A/C amp. via CAN communication line. | |
ECM |
| |
Ambient sensor | Ambient Sensor | |
PTC heater | PTC Heater | |
PTC heater relay 1/2/3 | PTC Heater Relay |
Control unit | Signal status |
A/C amp. |
|
Combination meter | Transmits the ambient temperature signal to A/C amp. via CAN communication. |
ECM |
|
PTC heater | Operation | PTC heater relay 1 | PTC heater relay 2 | PTC heater relay 3 |
OFF | OFF | OFF | OFF | OFF |
PTC heater-1 | LOW | ON | OFF | OFF |
PTC heater-2 | MID | ON | ON | OFF |
PTC heater-3 | HI | ON | ON | ON |
note | PTC heater operation depends on ambient temperature and battery voltage. PTC heater is ON when ambient temperature is 8°C (46.4°F) or less. PTC heater is OFF when ambient temperature is 12°C (53.6°F) or more. The operating voltage of the PTC heater ON/OFF changes depending on the electrical load of the vehicle or battery voltage. |