• Code: H3-01
• Description: Fusing section high temperature trouble (TH_LM)
• Causes: The fusing temperature exceeds the specified level. Thermister trouble. PCU PWB trouble.Harness and connector connection trouble. Power unit trouble.
• Remedy: Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble. Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble. Replace the power unit.

• Code: H3-02
• Description: Fusing section high temperature trouble (TH_US)
• Causes: The fusing temperature exceeds the specified level. Thermister trouble. PCU PWB trouble Connection trouble of the connector and the harness. Power unit trouble.
• Remedy: Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble. Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble. Replace the power unit.

• Code: H3-04
• Description: Fusing section high temperature trouble (TH_EX1)
• Causes: The fusing temperature exceeds the specified level. Thermister trouble. PCU PWB trouble. Connection trouble of the connector and the harness. Power unit trouble. Fusing unit not installed.
• Remedy: Replace the power unit. Replace the PCU PWB. Harness and connector connection trouble. Use SIM14 to cancel the trouble.

• Code: H3-05
• Description: Fusing section high temperature trouble (TH_EX2)
• Causes: The fusing temperature exceeds the specified level. Thermister trouble. PCU PWB trouble. Connection trouble of the connector and the harness. Power unit trouble.
• Remedy: Replace the thermister. Replace the PCU PWB. Harness and connector connection trouble. Replace the power unit. Use SIM14 to cancel the trouble.

• Code: H4-00
• Description: Fusing section low temperature trouble (TH_UM_AD2)
• Causes: The fusing temperature does not reach the specified level within the specified time from turning ON the power relay. Thermister trouble. Heater lamp trouble. PCU PWB trouble. Thermostat trouble. Connector, harness connection trouble. Power unit trouble. Interlock switch trouble.
• Remedy: Replace the thermister. Replace the heater lamp. Replace the PCU PWB. Replace the thermostat. Check connection of the connector and the harness. Replace the power unit. Replace the interlock switch. Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble.

• Code: H4-01
• Description: Fusing section low temperature trouble (TH_LM)
• Causes: The fusing temperature does not reach the specified level within the specified time from turning ON the power relay. Thermister trouble. Heater lamp trouble. PCU PWB trouble Thermostat trouble. Connector, harness connection trouble. Power unit trouble. Interlock switch trouble.
• Remedy: Replace the thermister. Replace the heater lamp. Replace the PCU PWB. Replace the thermostat. Check connection of the connector and the harness. Replace the power unit. Replace the interlock switch. Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble.

• Code: H4-02
• Description: Fusing section low temperature trouble (TH_US)
• Causes: The fusing temperature does not reach the specified level within the specified time from turning ON the power relay. Thermister trouble. Heater lamp trouble. PCU PWB trouble Thermostat trouble. Connector, harness connection trouble. Power unit trouble. Interlock switch trouble.
• Remedy: Replace the thermister. Replace the heater lamp. Replace the PCU PWB. Replace the thermostat. Check connection of the connector and the harness. Replace the power unit. Replace the interlock switch. Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble.

• Code: H4-04
• Description: Fusing section low temperature trouble (TH_EX)
• Causes: The specified temperature is not reached within the specified time from starring warm-up. Thermister trouble. Heater lamp trouble. PCU PWB trouble. Thermostat trouble. Power unit trouble.
• Remedy: Use SIM5-2 to check the operation of the heater lamp. Replace the thermister. Replace the PCU PWB. Check connection of the connector and the harness. Replace the heater lamp. Replace the power unit. Use SIM14 to cancel the trouble.