• Code: H2-02
• Description: Sub thermistor open (TH_US)
  Thermistor open
• Causes: Thermistor trouble, control PWB trouble, fusing section connector connection trouble, AC power source trouble, fusing unit not-installed
• Remedy: Check the harness and the connector from the thermistor to the control PWB.

• Code: H2-03
• Description: Non-contact thermistor compensation thermistor open (TH_UM_AD1)
  Thermistor open
• 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: H3-00
• Description: Fusing section high temperature trouble (TH_UM)
  The fusing temperature inside the PWB exceeds the specified level.
• 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)
  The fusing temperature inside the PWB exceeds the specified level
• 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)
  The fusing temperature inside the PWB exceeds the specified level.
• 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: H4-00
• Description: Fusing section low temperature trouble (TH_UM_AD2)
  The temperature does not reach the specified level within the specified time after turning on the power relay.
• 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 control 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.

• Code: H4-01
• Description: Fusing section low temperature trouble (TH_LM)
  The temperature does not reach the specified level within the specified time after turning on the power relay.
• 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 control 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.

• Code: H4-02
• Description: Sub thermistor fusing section low temperature trouble (TH_US)
  The temperature does not reach the specified level within the specified time after turning on the power relay.
• 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 control 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.