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 MANUALSLEXUS2010RX 450H 3.5 BREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSSMART ACCESS SYSTEM (KEYLESS ENTRY) (DIAGNOSTICS - INTRODUCTION)SMART ACCESS SYSTEM WITH PUSH-BUTTON START (FOR ENTRY FUNCTION)DIAGNOSTIC TROUBLE CODE CHART (FROM 08/2009)DIAGNOSTIC TROUBLE CODE CHART
2010 Lexus RX 450h 3.5 B
Diagnostic Trouble Code Chart
2010 Lexus RX 450h 3.5 BSECTION Diagnostic Trouble Code Chart
HINT:
If a trouble code is stored during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer tothe "See" below.
CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
| DTC Code | Detection Item | Trouble Area | See |
|---|---|---|---|
| B27A1 | Open in Driver Side Electrical Antenna Circuit | 1. Front door outside handle assembly (for driver side) 2. Certification ECU (Smart key ECU assembly) 3. Wire harness or connector |
Refer to DTC B27A1: Open in Driver Side Electrical Antenna Circuit |
| B27A2 | Open in Front Passenger Side Electrical Antenna Circuit | 1. Front door outside handle assembly (for front passenger side) 2. Certification ECU (Smart key ECU assembly) 3. Wire harness or connector |
Refer to DTC B27A2: Open in Front Passenger Side Electrical Antenna Circuit |
| B27A5 | Open in Front Floor Electrical Key Oscillator Circuit | 1. Indoor electrical key oscillator (for front floor) 2. Certification ECU (smart key ECU assembly) 3. Wire harness or connector |
Refer to DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit |
| B27A6 | Open in Rear Floor Electrical Key Oscillator Circuit | 1. Indoor electrical key oscillator (for center floor) 2. Certification ECU (smart key ECU assembly) 3. Wire harness or connector |
Refer to DTC B27A6: Open in Rear Floor Electrical Key Oscillator Circuit |
| B27A7 | Open in Inside Luggage Compartment Electrical Key Oscillator Circuit | 1. Indoor electrical key oscillator (for rear floor) 2. Certification ECU (smart key ECU assembly) 3. Wire harness or connector |
Refer to DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit |
| B27A8 | Open in Outside Luggage Compartment Electrical Key Antenna Circuit | 1. Outside electrical key oscillator (for rear side) 2. Certification ECU (smart key ECU assembly) 3. Wire harness or connector |
Refer to DTC B27A8: Open in Outside Luggage Compartment Electrical Key Antenna 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.