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 MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSTHEFT DETERRENT & KEYLESS ENTRY
2009 Toyota Sequoia Limited, 5.7 Y, RWD
Theft Deterrent & Keyless Entry
2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Theft Deterrent & Keyless Entry
- Engine Immobilizer System
- Parts Location
- System Diagram
- System Description
- How To Proceed With Troubleshooting
- Registration
- Problem Symptoms Table
- Terminals Of Ecu
- DTC Check/Clear
- Data List / Active Test
- Diagnostic Trouble Code Chart
- DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction
- DTC B2784 Antenna Coil Open / Short
- DTC B2793 Transponder Chip Malfunction; DTC B2794 Unmatched Encryption Code; DTC B2795 Unmatched Key Code
- DTC B2796 No Communication in Immobilizer System
- DTC B2797 Communication Malfunction No. 1; DTC B2798 Communication Malfunction No. 2
- DTC B2799 Engine Immobilizer System Malfunction
- DTC B279A Theft Deterrent System Communication Line High Fixation
- DTC B279C Theft Deterrent System Presence Detection
- Security Indicator Light Circuit
- ECU Power Source Circuit
- Theft Deterrent System
- Parts Location
- System Diagram
- System Description
- How To Proceed With Troubleshooting
- Customize Parameters
- Problem Symptoms Table
- Terminals Of Ecu
- Diagnosis System
- Data List / Active Test
- Engine Hood Courtesy Switch Circuit
- Horn Circuit
- Security Horn Circuit
- Ignition Switch Circuit
- Glass Breakage Sensor ECU Circuit
- Security Indicator Light Circuit
- ECU Power Source Circuit
- Glass Breakage Sensor
- Engine Hood Courtesy Switch
- Transponder Key Amplifier
- Security Horn Assembly
- Transponder Key Ecu
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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.