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.
2010 Lexus RX 450h 3.5 BFACTORY OEM SERVICE PROCEDURE
Air Conditioning System (From 08/2009)
AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | 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 |
| B1423/23 | Pressure Sensor Circuit |
| B1441/41 | Air Mix Damper Control Servo Motor Circuit (Passenger Side) |
| B1442/42 | Air Inlet Damper Control Servo Motor Circuit |
| B1443/43 | Air Outlet Damper Control Servo Motor Circuit |
| B1446/46 | Air Mix Damper Control Servo Motor Circuit (Driver Side) |
| B1461/61 | Emission Gas NOx Sensor Circuit |
| B1462/62 | Room Humidity Sensor Circuit |
| B1471/71 | A/C Inverter High Voltage Power Resource System Malfunction |
| B1472/72 | A/C Inverter High Voltage Output System Malfunction |
| B1473/73 | A/C Inverter Start-up Signal System Malfunction |
| B1474/74 | A/C Inverter Malfunction |
| B1475/75 | A/C Inverter Cooling / Heating System Malfunction |
| B1476/76 | A/C Inverter Load System Malfunction |
| B1477/77 | A/C Inverter Low Voltage Power Resource System Malfunction |
| B1497/97 | BUS IC Communication Malfunction |
| B1498/98 | Communication Malfunction (A/C Inverter Local) |
| B14A2 | Driver Side Solar Sensor Short Circuit |
| B14A3 | Front Passenger Side Solar Sensor Short Circuit |
| U0100 | Lost Communication with ECM |
| U0101 | Lost Communication with TCM |
| U0131 | Lost Communication with Electric Power Steering ECU |
| U0142 | Lost Communication with Main Body ECU |
| U0155 | Lost Communication with Combination Meter |
| U0293 | Lost Communication with HV ECU |
HYBRID CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| P0AA6-611 | Hybrid Battery Voltage System Isolation Fault |
Factory Service Tools
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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.
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