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 605 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS)
2004 Toyota Matrix XR, FWD, Standard
Section 605 (Multiplex Communication System - Diagnosis)
2004 Toyota Matrix XR, FWD, StandardSECTION Section 605 (Multiplex Communication System - Diagnosis)
WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- How To Proceed With Troubleshooting
- Pre-Check
- Diagnostics Trouble Code Chart
- Location
- Terminals Of Ecu
- Problem Symptoms Table
- DTC B1211: Driver Door Ecu Communication Stop
- DTC B1212: Front Passenger Door Ecu Communication Stop
- DTC B1213: Tilt And Telescopic Ecu Communicating Stop
- DTC B1214: Door System Communication Bus Malfunction (+B Short), DTC B1215: Door System Communication Bus Malfunction (GND Short), DTC B1266: Instrument Panel System Communication Bus Malfunction (+B Short), DTC B1267: Instrument Panel System Communication Bus Malfunction (GND Short), DTC B1291: Light System Communication Bus Malfunction (+B Short) & DTC B1292: Light System Communication Bus Malfunction (GND Short)
- DTC B1247: Tire Pressure Monitor Receiver Communication Stop
- DTC B1248: AVC-LAN Communication Impossible
- DTC B1261: ECM (Engine Ecu) Communication Stop
- DTC B1262: A/C Ecu Communication Stop
- DTC B1263: Luggage Room Junction Block Ecu Communication Stop
- DTC B1269: Theft Deterrent Ecu Communication Stop
- DTC B1271: Combination Meter Ecu Communication Stop
- DTC B1272: Power Seat Ecu Communication Stop
- DTC B1273: Sliding Roof Ecu Communication Stop
- DTC B1278: Combination Switch Ecu Communication Stop
- DTC B1281: Airbag Ecu Communication Stop
- DTC B1282: Skid Control Ecu Communication Stop
- DTC B1283: Driver Side Junction Block Ecu Communication Stop
- DTC B1284: Passenger Side Junction Block Ecu Communication Stop
- DTC B1285: Steering Pad Switch Communication Stop
- DTC B1289: Passenger Seat Ecu Communication Stop
- DTC B1294: Immobilizer Ecu Communication Stop
- DTC B1296: Front Light Ecu Communication Stop
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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.