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.
2005 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
HVAC DTCS
HVAC DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| 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 Inlet 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 |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.