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.
2003 Lexus GS 430FACTORY OEM SERVICE PROCEDURE
HVAC DTCS
HVAC DIAGNOSTIC TROUBLE CODE (DTC) INDENTIFICATION
| DTC | Description |
|---|---|
| B1411/11 | Room temperature sensor circuit |
| B1412/12 | Ambient temperature sensor circuit |
| B1413/13 | Evaporator temperature sensor circuit |
| B1418/18 | Exhaust gas sensor circuit |
| B1421/21 | Solar sensor circuit (Passenger Side) |
| B1422/22 | All conditions below are detected for 3 sec. or more
|
| B1423/23 | Open in pressure sensor circuit Abnormal refrigerant pressure [below 196 kPa (2.0 kgf/cm2 , 28 psi) over 3,140 kPa (32.0 kgf/cm2 , 455 psi)] |
| B1424/24 | Solar sensor circuit (Driver Side) |
| B1431/31 | Air mix damper position sensor circuit (Passenger Side) |
| B1432/32 | Air inlet damper position sensor circuit |
| B1433/33 | Air outlet damper position sensor circuit |
| B1436/36 | Air mix damper position sensor circuit (Driver Side) |
| B1441/41 | Air mix damper control servomotor circuit (Passenger side) |
| B1442/42 | Air inlet damper control servomotor |
| B1443/43 | Air outlet damper control servomotor circuit |
| B1446/46 | Air mix damper control 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.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.