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 MANUALSTOYOTA20184RUNNER SR5, 4WDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSSMART KEY SYSTEM (FOR ENTRY FUNCTION) - DIAGNOSTICS - INTRODUCTION (2 OF 2)SMART KEY SYSTEM (FOR ENTRY FUNCTION)OPERATION CHECK [08/2019 - 08/2021]OPERATION CHECK [08/2019 - 08/2021]
2018 Toyota 4Runner SR5, 4WD
Operation Check [08/2019 - 08/2021]
2018 Toyota 4Runner SR5, 4WDSECTION Operation Check [08/2019 - 08/2021]
- CHECK SMART KEY SYSTEM (for Entry Function) OPERATION NOTE:
Make sure that the smart key system (for Entry Function) has not been canceled before performing this inspection.
- Check the entry unlock function (driver door, front passenger door).
- Perform a wireless lock operation to lock the door, touch the unlock sensor built into the backside of the front door outside handle assembly of the driver door while carrying the electrical key transmitter sub-assembly and check that the door unlocks.
- Inspect the entry unlock detection area. Hold the electrical key transmitter sub-assembly at the same height as the front door outside handle assembly and approximately 0.7 to 1 m (2.30 to 3.28 ft.) from the vehicle as shown in the illustration and check that the LED (red) of the electrical key transmitter sub-assembly blinks.
*a 0.7 to 1 m (2.30 to 3.28 ft.) - With the system in unlock standby mode, grasp the front door outside handle assembly and check that the door unlocks.
HINT:
- The system is in unlock standby mode when the electrical key transmitter sub-assembly is in the detection area and the key ID code sent by the electrical key transmitter sub-assembly matches the key ID code stored by the certification ECU (smart key ECU assembly).
- Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the front door outside handle assembly.
- Inspect the front passenger door using the same procedure.
- Check the unlock response sensitivity. With the system in unlock standby mode, touch the area shown in the illustration and check that the door unlocks.NOTE:
If the sensor is touched too quickly or released too slowly, the sensor may not react and the door will not unlock.
- Check the entry unlock function (driver door, front passenger door).
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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.