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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 152 (Engine Control System (2GR-FKS) - Diagnostic Codes (5 Of 7)) >> SFI System >> DTC P0597-12: Thermostat Heater Control Circuit Short to Battery [10/2017 - ] >> Monitor Description

Monitor Description

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The ECM monitors the output voltage while the thermostat heater is operating.

The thermostat heater turns on and off according to ON/OFF switching of a transistor inside the ECM.

If a continuous mismatch occurs between the ECM transistor state and the output voltage, the ECM determines there is a malfunction in the thermostat heater circuit and stores a DTC.

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