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 169 (ENGINE IMMOBILIZER SYSTEM)SELF-DIAGNOSTIC SYSTEMRETRIEVING DIAGNOSTIC TROUBLE CODESUSING INDICATOR LIGHT
2004 Toyota Matrix XR, FWD, Standard
Using Indicator Light
2004 Toyota Matrix XR, FWD, StandardSECTION Using Indicator Light
WARNING: This page is about a different car, the 2002 Lexus GS 430 and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Check the DTC using the diagnosis check wire (SST 09843-18040).
- Turn the ignition switch ON.
- Using the diagnosis check wire, connect between terminals No. 11 (Tc) and No. 3 (E1) of DLC1. See CONNECTOR IDENTIFICATION .
- Read the diagnostic trouble code from the malfunction indicator lamp. If a diagnostic trouble code is not output, check the Tc terminal circuit. See COMPUTER DATA LINES in SYSTEM WIRING DIAGRAMS article. The ECM controls the immobilizer function of this vehicle, DTC is output with engine data. As an example, the blinking patterns for codes; normal, 12 and 99 are shown in charts. See Fig 1.
- When DTC 99 is output, there is an immobilizer system trouble. See PROBLEM SYMPTOM INDEX table.
- After completing the check, disconnect terminals No. 13 (Tc) and No. 4 (CG) and turn off the display. In the event of 2 or more malfunction codes, indication will begin from the smaller numbered code and continue in order to the larger.
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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.