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)ACCESSORIES & EQUIPMENTDRIVERS ASSISTANCE SYSTEMS - ADASMULTI-TERRAIN MONITOR SYSTEM - DIAGNOSTIC CODES, SYMPTOM TESTS & CIRCUIT TESTSMULTI-TERRAIN MONITOR SYSTEMECU POWER SOURCE CIRCUIT [12/2024 - ]PROCEDURE
2025 Toyota 4Runner SR5, 4WD
ECU Power Source Circuit [12/2024 - ]: Procedure
2025 Toyota 4Runner SR5, 4WDSECTION Procedure
- CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - AUXILIARY BATTERY AND BODY GROUND)
- Disconnect the K59 parking assist ECU connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition K59-1 (GND1) - Body ground Always Below 1 Ω - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Switch Condition Specified Condition K59-4 (IG) - K59-1 (GND1) Ignition switch ON 11 to 14 V Ignition switch off Below 1 V Result
Proceed to OK NG
Result:
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
Refer to PROBLEM SYMPTOMS TABLE [12/2024 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
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.