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.
2000 Lexus GS 300FACTORY OEM SERVICE PROCEDURE
HVAC DTCS
HVAC DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B1411/11 | In-Vehicle Temperature Sensor Circuit |
| B1412/12 | Outside Temperature Sensor Circuit |
| B1413/13 | Evaporator Temperature Sensor Circuit |
| B1418/18 | Exhaust Gas Sensor Circuit |
| B1421/21 | Solar Sensor Circuit (Passenger Side) |
| B1422/22 | Compressor Lock Sensor Circuit |
| B1423/23 | Abnormal Refrigerant Pressure (Pressure Switch Circuit) |
| B1424/24 | Solar Sensor Circuit (Driver Side) |
| B1431/31 | Air Mix Door Position Sensor Circuit (Passenger Side) |
| B1432/32 | Air Inlet Door Position Sensor Circuit |
| B1433/33 | Air Outlet Door Position Sensor Circuit |
| B1436/36 | Air Mix Door Position Sensor Circuit (Driver Side) |
| B1441/41 | Air Mix Servomotor Circuit (Passenger Side) |
| B1442/42 | Air Inlet Servomotor Circuit |
| B1443/43 | Air Outlet Servomotor Circuit |
| B1446/46 | Air Mix Servomotor Circuit (Driver Side) |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.