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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 267 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS)
2004 Toyota Celica GT, Standard
Section 267 (Multiplex Communication System - Diagnostics)
2004 Toyota Celica GT, StandardSECTION Section 267 (Multiplex Communication System - Diagnostics)
WARNING: This page is about a different car, the 2002 Toyota Sequoia. 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 Codes
- Parts Location
- Terminals Of Ecu
- Circuit Inspection
- DTC B1211/11: Driver Door Ecu Communication Stop
- DTC B1212/12: Passenger Door Ecu Communication Stop
- DTC B1214/14, B1215/15: Communication Bus Malfunction (+B Short/GND Short)
- DTC B1221/21, B1222/22, B1223/23, B1224/24: Power Window Switch Circuit On Door & Door Lock Switch Circuit On Door
- DTC B1231/31, B1233/33: Jam Protection Limit Switch Circuit On Door
- DTC B1232/32, B1234/34: Jam Protection Pulse Switch Circuit On Door
- DTC B1241/41: Body Ecu Switch Circuit Diagnosis
- DTC B1242/42: Wireless Door Lock Tuner Circuit Malfunction
- DTC B1243/43: GSW Terminal Circuit Malfunction
- DTC B1244/44: Light Sensor Circuit Malfunction
- DTC B1271/71: Combination Meter Ecu Communication Stop
- DTC B1273/73: Sliding Roof Ecu Communication Stop (W/Sliding Roof Vehicle Only)
- DTC B1287/87: Back Door 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.