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.
Circuit Description
The cruise control system cancels cruising when the ECM detects that the brake pedal is depressed while cruise control driving. The stop lamp switch assy sends signals to the ECM according to the brake pedal conditions. When the brake pedal is free, terminal ST1 - is positive (+) battery voltage, and terminal STP voltage is below 1 V. While depressing the brake pedal, terminal ST1 - is below 1 V, and STP is positive (+) battery voltage. Under braking, the ECM cancels cruise control drive as one of the manual cancel functions. The ECM outputs this trouble code when voltage of terminals ST1 - and STP are both below 1 V for 0.5 second or more at the same moment.
Fail-safe function operates to enable normal driving even if there is a malfunction in the stop lamp signal circuit.
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.