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
When the brake pedal is depressed, the stop light switch sends a signal to the ECM. See Fig 1. When the ECM receives this signal, it cancels the cruise control. A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop light signal circuit.
The cancel condition is that battery positive voltage is supplied to connector E4 terminal No. 4 (STP). When the brake is on, battery positive voltage is normally applied through the STOP fuse and stop light switch to connector E4 terminal No. 4 (STP) of the ECM, and the ECM turns the cruise control OFF. If the harness connected to connector E4 terminal No. 4 (STP) has an open circuit, connector E4 terminal No. 4 (STP) will have battery positive voltage and the cruise control will be turned OFF.
Trouble Area
- Stop Light Switch.
- Harness or connector between ECM and stop light switch circuit.
- ECM.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.