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 MANUALSTOYOTA20054 RUNNER 2WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSDTC 52CRUISE CONTROL SYSTEM
2005 Toyota 4 Runner 2WD V8-4.7L (2UZ-FE)
Cruise Control System
2005 Toyota 4 Runner 2WD V8-4.7L (2UZ-FE)SECTION Cruise Control System
DTC 52 BRAKE SWITCH "A" CIRCUIT
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop lamp switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control.
A fail-safe function is provided so that the functions normally, even if there is a malfunction in the stop lamp signal circuit.
The cancel condition occurs as battery positive voltage is supplied to terminal STP.
When the brake is on, battery positive voltage is normally applied through the STOP fuse and the stop lamp switch assembly to terminal STP of the ECM, and the ECM turns the cruise control OFF.
If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive voltage and the cruise control will be turned OFF.
INSPECTION PROCEDURE
CIRCUIT DESCRIPTION
DTC Detection Condition:
When the brake pedal is depressed, the stop lamp switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control.
A fail-safe function is provided so that the functions normally, even if there is a malfunction in the stop lamp signal circuit.
The cancel condition occurs as battery positive voltage is supplied to terminal STP.
When the brake is on, battery positive voltage is normally applied through the STOP fuse and the stop lamp switch assembly to terminal STP of the ECM, and the ECM turns the cruise control OFF.
If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive voltage and the cruise control will be turned OFF.
Wiring Diagram:
Step 1 - 3:
Step 3 (Continued):
INSPECTION PROCEDURE
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.