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 MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 206 (CRUISE CONTROL)CIRCUIT TESTSSTOP LIGHT SWITCH CIRCUITINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard
Inspection Procedure
2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
- Check that the stop light comes ON when the brake pedal is depressed, and turns OFF when the brake pedal is released. If the results are OK, go to the next step. If the results are not OK, check the stop light system. See appropriate BODY CONTROL SYSTEM article in COMMUNICATION DEVICES.
- Check the input signal. See INPUT SIGNAL CHECK under SELF-DIAGNOSTIC SYSTEM. Check the indicator light when the brake pedal is depressed. The results are OK if the indicator light goes OFF when the brake pedal is depressed (stop light switch ON). If the results are OK, proceed to the next circuit inspection of the symptom. See PROBLEM SYMPTOM INDEX table. If the results are not OK, go to the next step.
- Remove the cruise control ECU with the connectors still connected. Turn the ignition switch ON. Connect the positive lead (+) to terminal No. 3 (STP) of the cruise control ECU connector and the negative (-) lead to body ground, when the brake pedal is depressed and released. See CONNECTOR IDENTIFICATION . The results are OK if the voltage is 10-14 volts when the pedal is depressed and below 1 volt when the pedal is released. If the results are OK, proceed to the next circuit inspection of the symptom. See PROBLEM SYMPTOM INDEX table. If the results are not OK, go to the next step.
- Check for an open in the wiring harness and connectors between terminal No. 3 (STP) of the cruise control ECU and stop light switch. If the results are OK check and replace the cruise control ECU. See CRUISE CONTROL ECU under REMOVAL & INSTALLATION. If the results are not OK, repair or replace the wiring harness or connector.
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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.