PTC Heater

W4 WATER TEMP. SENSOR
1 - 2 : Approx. 90 kOhm (-30°C, -22°F)
: Approx. 5 kOhm (25°C, 77°F)
: Approx. 2.657 kOhm (40°C, 104°F)

P4 PTC AMPLIFIER
6 - GROUND : Always continuity
3 - GROUND : Approx. 12 volts with the ignition SW at ON position
4 - GROUND : Approx. 12 volts with the ignition SW at ON position, the blower SW on and the max hot SW on
5 - GROUND : Pulse generation with the engine cranking
16 - GROUND : Always continuity
17 - GROUND : Pulse generation with the engine cranking