• Code: H2-04
• Description: External heating thermistor open (TH_EX1)
• Causes: Thermistor trouble, control PWB trouble, fusing section connector connection trouble, AC power source trouble
• Remedy: Check the harness and the connector from the thermistor to the control PWB.

• Code: H2-05
• Description: Fusing external heating thermistor open (TH_EX2)
• Causes: Thermistor open
• Remedy: Case 1 Cause Fusing section connector and harness connection trouble Check and remedy Check the harness and the connector from the thermistor to the PCU PWB. Case 2 Cause Thermistor trouble, PCU PWB trouble Check and remedy Replace the thermistor or the PCU PWB.

• Code: H3-00
• Description: Fusing section high temperature trouble (TH_UM)
• Causes: Thermistor trouble, control PWB trouble, fusing section connector connection error, AC power source trouble
• Remedy: 1) Use SIM5-2 to check blinking of the heater lamp. 2) If it blinks normally, check the thermistor and the harness. Check the control PWB thermistor input circuit section. 3) If the heater lamp keep lighting, check the AC PWB and the control PWB lamp control circuit. 4) Use SIM14 to cancel the trouble.

• Code: H3-01
• Description: Fusing section high temperature trouble (TH_LM)
• Causes: Thermistor trouble, control PWB trouble, fusing section connector connection error, AC power source trouble
• Remedy: 1) Use SIM5-2 to check blinking of the heater lamp. 2) If it blinks normally, check the thermistor and the harness. Check the control PWB thermistor input circuit section. 3) If the heater lamp keep lighting, check the AC PWB and the control PWB lamp control circuit. 4) Use SIM14 to cancel the trouble.

• Code: H3-02
• Description: Sub thermistor fusing section high temperature trouble (TH_US)
• Causes: Thermistor trouble, control PWB trouble, fusing section connector connection error, AC power source trouble
• Remedy: 1) Use SIM5-2 to check blinking of the heater lamp. 2) If it blinks normally, check the thermistor and the harness. Check the control PWB thermistor input circuit section. 3) If the heater lamp keep lighting, check the AC PWB and the control PWB lamp control circuit. 4) Use SIM14 to cancel the trouble.

• Code: H3-04
• Description: External heating thermistor high temperature trouble (TH_EX1)
• Causes: Thermistor trouble, control PWB trouble, fusing section connector connection error, AC power source trouble
• Remedy: 1) Use Sim44-14 to check if the thermistor (TH_EX1) shows an abnormal temperature. If the display is normal, use Sim5-2 to check the blinking operation of the heater lamp. a) If it blinks normally, check the thermistor and the harness. Check the control PWB thermistor input circuit section. b) If the heater lamp keep lighting, check the AC PWB and the control PWB lamp control circuit. 2) Use SIM14 to cancel the trouble.

• Code: H3-05
• Description: Fusing external thermistor high temperature trouble (TH_EX2)
• Causes: It is detected that the fusing temperature exceeds the specified temperature.
• Remedy: Case 1 Cause Fusing section connector and harness connection trouble Check and remedy Check the harness and the connector from the thermistor to the PCU PWB. Use SIM14 to cancel the trouble. Case 2 Cause Thermistor trouble, PCU PWB trouble Check and remedy Replace the thermistor or the PCU PWB. Use SIM14 to cancel the trouble.

• Code: H4-00
• Description: Fusing section low temperature trouble (TH_UM_AD2)
• Causes: Thermistor trouble, heater lamp trouble, PCU PWB trouble, thermostat trouble, AC power source trouble, interlock switch trouble
• Remedy: 1) Use SIM5-2 to check blinking of the heater lamp. 2) If it blinks normally, check the thermistor and the harness. Check the PCU PWB thermistor input circuit section. 3) If it is not lighted, check for the heater lamp disconnection and the thermostat breakage. Check the interlock switch. Check the AC PWB and the PCU PWB lamp control circuit. 4) Use SIM14 to cancel the trouble.