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 224 (ANTI-THEFT SYSTEM)CIRCUIT TESTSIGNITION 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 IS 300 and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the driver side junction block fuse box opening cover. Remove the ECU-IG fuse from the driver side junction block. Check the continuity of the ECU-IG fuse. If there is continuity, go to the next step. If there is not continuity, check for a short in all the harnesses and components connected to the ECU-IG fuse.
- Disconnect the theft deterrent ECU connectors. Turn the ignition switch ON. Measure the voltage between terminal T5-10 (IG) of the theft deterrent ECU connector and body ground. If there is voltage between 10-14 volts, check and replace the theft deterrent ECU. If the voltage is not as specified, check and repair the harness and connector between the theft deterrent ECU and battery.
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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.