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 842 (ENGINE IMMOBILIZER SYSTEM - DIAGNOSIS)TERMINALS OF ECU
2004 Toyota Matrix XR, FWD, Standard
Terminals Of Ecu
2004 Toyota Matrix XR, FWD, StandardSECTION Terminals Of Ecu
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
VOLTAGE SPECIFICATION
| Symbols (Terminals No.) | Wiring Color | Condition | STD Voltage (V) |
|---|---|---|---|
| T9-1 - T9-14 (CPUB - GND) | V-Y - W-B | Constant | 10 - 14 V |
| T9-2 - T9-14 (IG2 - GND) | B-W-B | Ignition switch ON | 10 - 14 V |
| T9-3 - T9-14 (KSW - GND) | LG-B - W-B | Key unlock warning switch ON (Ignition key inserted) | Below 1 V |
| T9-4 (MPX1) | P-L | Multiplex communication circuit | - |
| T9-5 (MPX2) | P-L | Multiplex communication circuit | - |
| T9-6 (EFIO) | GR-G | ECM communication circuit | - |
| T9-7 (EFII) | GR-R | ECM communication circuit | - |
| T9-9 - T9-14 (VC12-GND) | O - W-B | Ignition key inserted (Transponder key ECU communication circuit) |
5 V (Pulse is generated) |
| T9-10 - T9-14 (CODE - GND) | R-W - W-B | Ignition key inserted (Transponder key ECU communication circuit) |
5 V (Pulse is generated) |
| T9-11 - T9-14 (RXCK - GND) | W-R - W-B | Ignition key inserted (Transponder key ECU communication circuit) |
5 V (Pulse is generated) |
| T9-12 - T9-14 (TXCT-GND) | L-B - W-B | Ignition key inserted (Transponder key ECU communication circuit) |
5 V (Pulse is generated) |
| T9-13 - Body ground (AGND - Body ground) | V - Body ground | Constant | Below 1 V |
| T9-14 - Body ground (GND-Body ground) | W-B - Body ground | Constant | Below 1 V |
RENDER: 1.0x
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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.