| PTC heater assembly | A1 - B1 : Below 1Ω A1 - B2 : Below 1Ω A2 - B2 : Below 1Ω A2 - B3 : Below 1Ω |
| Temperature control switch | 1 - 2 (OFF) : 10kΩ or higher 1 - 2 (ON) : Below 1Ω |
| PTC heater relay | 3 - 5 : 10kΩ or higher 3 - 5 : Below 1Ω(Apply battery voltage to terminals 1 and 2) |