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.
2003 Toyota Matrix Base, FWD, AutomaticFACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Splices
SPLICES LOCATION
| Component | Component Location |
|---|---|
| B1 | In front door left harness, near breakout for left front door speaker. See Figure. |
| B2 | In front door left harness, near breakout for left front door speaker. See Figure. |
| B3 | In roof harness, above left front door. See Figure. |
| B4 | In roof harness, at center of windshield header. See Figure. |
| B5 | In roof harness, at center of windshield header. See Figure. |
| B6 | In front door right harness, near breakout for right front door speaker. |
| B7 | In floor harness, near breakout for rear window defogger noise filter. |
| B8 | In back door harness No. 2, near breakout for license plate light. |
| B9 | In back door harness No. 2, near breakout for license plate light. |
| B10 | In floor harness, near breakout for occupant detection sensor. See Figure. |
| E1 | In engine room main harness, near breakout for skid control ECU. See Figure. |
| E2 (Except XRS) | In engine harness, near breakout for injector No. 3. See Figure. |
| E2 (XRS) | In engine harness, near breakout for ignition coil & igniter No. 3. See Figure. |
| E3 (Except XRS) | In engine harness, near breakout for engine coolant temperature sensor. See Figure. |
| E3 (XRS) | In engine harness, near breakout for ignition noise filter. See Figure. |
| E4 | In engine room main harness, near engine room J/B. See Figure. |
| I1 | In instrument panel harness, at left side of dash. See Figure. |
| I2 | In dash harness, behind instrument panel J/B. See Figure. |
| I3 | In dash harness, behind instrument panel J/B. See Figure. |
| I4 | In engine room main harness, behind left side of dash. See Figure. |
| I5 | In instrument panel harness, near breakout for daytime running light relay. |
| I6 | In instrument panel harness, near breakout for daytime running light relay. See Figure. |
| I7 | In instrument panel harness, near breakout for power outlet (115V). See Figure. |
| I8 | In instrument panel harness, near breakout for IF1. See Figure. |
| I9 | In instrument panel harness, near breakout for IF1. See Figure. |
| I10 | In instrument panel harness, near breakout for air inlet control servo motor. See Figure. |
| I11 | In instrument panel harness, near breakout for air inlet control servo motor. See Figure. |
| I12 | In engine harness, behind right side of dash, near pass-through grommet. |
| I13 | In engine harness, behind right side of dash, near pass-through grommet. See Figure. |
Factory Service Tools
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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.
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