PTC Heater Circuit

PTC HEATER CIRCUIT

CIRCUIT DESCRIPTION

The PTC heater is installed in the radiator in the heater unit on the driver and passenger's FOOT sides and operates when cooling water temperature is low and normal heater effectiveness is insufficient.

The air conditioner amplifier assembly switches the circuit in the PTC relay and operates the PTC heater when the operating conditions (cooling water temperature is Below 55°C (131°F), setting temperature is MAX. HOT, air outlet damper position is FOOT or FOOT/DEF and blower switch in not OFF) are met.

Wiring Diagram:

Step 1 - 3:

Step 4 - 5:

INSPECTION PROCEDURE