Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2004IS 300 BASE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONING SYSTEM - DIAGNOSIS
2004 Lexus IS 300 Base, Automatic
Air Conditioning System - Diagnosis
2004 Lexus IS 300 Base, AutomaticSECTION Air Conditioning System - Diagnosis
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Terminals Of Ecu
- Problem Symptoms Table
- Circuit Inspection
- DTC B1411: Room Temperature Sensor Circuit
- DTC B1412: Ambient Temperature Sensor Circuit
- DTC B1413: Evaporator Temperature Sensor Circuit
- DTC B1421: Solar Sensor Circuit
- DTC B1422: Compressor Lock Sensor Circuit
- DTC B1423: Pressure Switch Circuit
- DTC B1431: Air Mix Damper Position Sensor Circuit
- DTC B1432: Air Intel Damper Position Sensor Circuit
- DTC B1433: Air Outlet Damper Position Sensor Circuit
- DTC B1441: Air Mix Damper Control Servomotor Circuit
- DTC B1442: Air Inlet Damper Control Servomotor Circuit
- DTC B1443: Air Outlet Damper Control Servomotor Circuit
- Back Up Power Source Circuit
- IG Power Source Circuit
- Acc Power Source Circuit
- Heater Main Relay Circuit
- Blower Motor Circuit
- Compressor Circuit
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.