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 848 (DRIVER SIDE JUNCTION BLOCK (BODY NO. 2 CONTROL SYSTEM) - DIAGNOSIS)
2004 Toyota Matrix XR, FWD, Standard
Section 848 (Driver Side Junction Block (Body No. 2 Control System) - Diagnosis)
2004 Toyota Matrix XR, FWD, StandardSECTION Section 848 (Driver Side Junction Block (Body No. 2 Control System) - Diagnosis)
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.
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Diagnostic Trouble Code Chart
- Parts Location
- Terminals Of Ecu
- Problem Symptoms Table
- Circuit Inspection
- DTC B1244 Light Sensor Circuit Malfunction
- DTC B1268 Back-up Communication Bus Malfunction (between Combination Switch ECU and Driver Side Junction Block ECU)
- Power Source Circuit
- Mirror Switch Circuit
- Mirror Retract Switch Circuit
- Engine Hood Courtesy Switch Circuit
- Fuel Lid Opener Switch Circuit
- Luggage Opener Switch Circuit
- Hazard Switch Circuit
- Stop Light Switch Circuit
- Rheostat Light Control Volume Circuit
- Shoulder Belt Anchor Sensor Circuit
- Shoulder Belt Anchor Motor Circuit
- Driver Buckle Switch Circuit
- Driver Buckle Illumination Circuit
- Driver Seat Belt Tension Reducer Circuit
- Headlight Relay Circuit
- Headlight Cleaner Switch Circuit
- Combination Meter Circuit
- Turn Signal Light Circuit
- Illumination (Door courtesy switch signal) Circuit
- Inspection Procedure
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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.