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)BRAKESANTI-LOCK BRAKESBRAKE CONTROL / DYNAMIC CONTROL SYSTEM (SERVICE SPECIFICATIONS)BRAKE CONTROL / DYNAMIC CONTROL SYSTEMSSERVICE DATA [12/2024 - ]SERVICE DATA [12/2024 - ]TRAILER BRAKE CONTROL SWITCH
2025 Toyota 4Runner SR5, 4WD
Trailer Brake Control Switch
2025 Toyota 4Runner SR5, 4WDSECTION Trailer Brake Control Switch
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| K 72-8 (SRF) - K 72-5 (SRRT) | Always | 2 to 3.09 kΩ |
| K 72-8 (SRF) - K 72-16 (SRW1) | Manual trailer brake output slider operated to maximum position (100%) | Below 1 kΩ |
| K 72-8 (SRF) - K 72-16 (SRW1) | Manual trailer brake output slider not operated (0%) | 2 to 3 kΩ |
| K 72-8 (SRF) - K 72-14 (SRW2) | Manual trailer brake output slider operated to maximum position (100%) | 2 to 3 kΩ |
| K 72-8 (SRF) - K 72-14 (SRW2) | Manual trailer brake output slider not operated (0%) | Below 1 kΩ |
| K 72-8 (SRF) - K 72-15 (SRR) | Always | 12 to 14 Ω |
| K 72-4 (GA+) - K 72-6 (GND) | GAIN (+) selection button pressed | Below 20 Ω |
| K 72-4 (GA+) - K 72-6 (GND) | GAIN (+) selection button not pressed | 100 kΩ or higher |
| K 72-7 (GA-) - K 72-6 (GND) | GAIN (-) selection button pressed | Below 20 Ω |
| K 72-7 (GA-) - K 72-6 (GND) | GAIN (-) selection button not pressed | 100 kΩ or higher |
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.