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)PROBLEM SYMPTOMS TABLE (FROM 08/2009)PROBLEM SYMPTOMS TABLE
2010 Lexus RX 450h 3.5 B
Problem Symptoms Table
2010 Lexus RX 450h 3.5 BSECTION Problem Symptoms Table
HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
SMART ACCESS SYSTEM WITH PUSH-BUTTON START
| Symptom | Suspected Area | See |
|---|---|---|
| Entry answer-back buzzer does not sound | Wireless door lock control system | Refer to Entry Answer-back Buzzer does not Sound |
| Certification ECU (smart key ECU assembly) | - | |
| All door entry lock/unlock functions and wireless functions do not operate | Power door lock control system | Refer to All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate |
| Key (for Standard) | - | |
| Key battery | - | |
| Fuse (EFI NO. 1, ECU-B) | - | |
| Wire harness or connector | - | |
| Door control receiver assembly | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| All door entry lock/unlock functions do not operate, but wireless functions operate | Key | Refer to All Door Entry Lock/Unlock Functions do not Operate, but Wireless Functions Operate |
| Certification ECU (Smart key ECU assembly) | - | |
| All door entry lock/unlock functions do not operate using the key (for card type), but operate using the keys (for standard)* | Key battery | Refer to INSPECTION |
| Key (for Card Type) | - | |
| Driver side door entry unlock function does not operate | Power door lock control system | Refer to Driver Side Door Entry Unlock Function does not Operate |
| Front door outside handle assembly (for driver side) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Front passenger side door entry unlock function does not operate | Power door lock control system | Refer to Front Passenger Side Door Entry Unlock Function does not Operate |
| Front door outside handle assembly (for front passenger side) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Driver side door entry lock and unlock functions do not operate | Power door lock control system | Refer to Driver Side Door Entry Lock and Unlock Functions do not Operate |
| Front door outside handle assembly (for driver side) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Front passenger side door entry lock and unlock functions do not operate | Power door lock control system | Refer to Front Passenger Side Door Entry Lock and Unlock Functions do not Operate |
| Front door outside handle assembly (for front passenger side) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Driver side door entry lock function does not operate | Power door lock control system | Refer to Driver Side Door Entry Lock Function does not Operate |
| Front door outside handle assembly (for driver side) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Front passenger side door entry lock function does not operate | Power door lock control system | Refer to Front Passenger Side Door Entry Lock Function does not Operate |
| Front door outside handle assembly (for front passenger side) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Room oscillator does not recognize key | Indoor electrical key oscillator (for front floor) | Refer to Room Oscillator does not Recognize Key |
| Indoor electrical key oscillator (for center floor) | - | |
| Indoor electrical key oscillator (for rear floor) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Entry interior alarm does not sound | Meter/gauge system | Refer to Entry Interior Alarm does not Sound |
| Certification ECU (Smart key ECU assembly) | - | |
| Back door entry unlock function does not operate | Power door lock control system | Refer to Back Door Entry Unlock Function does not Operate |
| Back door opener switch assembly | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - | |
| Back door entry lock and unlock functions do not operate | Power door lock control system | Refer to Back Door Entry Lock and Unlock Functions do not Operate |
| Outside electrical key oscillator (for rear side) | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Back door opener switch assembly | - | |
| Wire harness or connector | - | |
| Back door entry lock function does not operate | Power door lock control system | Refer to Back Door Entry Lock Function does not Operate |
| Back door opener switch assembly | - | |
| Certification ECU (Smart key ECU assembly) | - | |
| Wire harness or connector | - |
*: w/ Key (for Card Type)
RENDER: 1.0x
NO RELATED
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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.