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 MANUALSTOYOTA20254RUNNER SR5, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSSMART KEY SYSTEM (FOR START, EXCEPT HEV) - DIAGNOSTICS - INTRODUCTIONSMART KEY SYSTEM (FOR START FUNCTION, GASOLINE MODEL)WIRELESS SYSTEMS FUNCTION CHECK [12/2024 - ]CAUTION / NOTICE / HINT

2025 Toyota 4Runner SR5, 4WD

Caution / Notice / Hint

2025 Toyota 4Runner SR5, 4WDSECTION Caution / Notice / Hint

NOTE:

Before starting, make sure to perform troubleshooting in accordance with "TROUBLESHOOTING PRE-CHECK".
Refer to TROUBLESHOOTING PRE-CHECK [12/2024 - ]
When asking the customer for details about the vehicle operating conditions, environment and malfunction, refer to "CUSTOMER PROBLEM ANALYSIS CHECK".
Refer to CUSTOMER PROBLEM ANALYSIS CHECK [12/2024 - ]
Make sure that the smart key system has not been disabled by a customize setting.

HINT:

Replace parts related to the wireless door lock control system and smart key system according to the inspection procedure.
If the wireless door lock control system and smart key system do not operate, check the customize settings and make sure that the wireless door lock control system and smart key system are not disabled.
The wireless door lock control system and smart key system primarily use the following systems.
- Power door lock control system
- Wireless door lock control system
- Smart key system (for Entry Function)
- Smart key system (for Start Function)
  1. Immobiliser function
If 2 or more electrical key transmitter sub-assemblies are registered to the system, make sure to perform troubleshooting with all of them.

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.