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 153 (CRUISE CONTROL SYSTEMS)DIAGNOSTIC TESTSDTC P1520/52: STOP LIGHT SWITCH CIRCUITDIAGNOSTIC PROCEDURE
2004 Toyota Matrix XR, FWD, Standard
Diagnostic Procedure
2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
For circuit wiring diagram, see Fig 1.
- Connect the hand-held tester to the DLC3. See Figure. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item STP LIGHT SW in the DATA LIST and read it's value displayed on the hand-held tester. Read the value of the hand-held tester. If the results are OK (brake pedal depressed: ON, brake pedal released: OFF), proceed to the next circuit inspection shown in the problem symptom table. See CRUISE CONTROL PROBLEM SYMPTOMS table. If the results are not good, go to the next step.
- Inspect the stop lamp switch assembly. See Fig 2. If the continuity is OK, go to the next step. If the continuity is not good, replace the stop lamp switch assembly.
- Check the STP and ST1- harness and connector. See Fig 3. If the voltage is OK, check and replace the ECM. If the voltage is not good, repair or replace the 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.