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 125 (MULTIPLEX COMMUNICATION SYSTEM)
2004 Toyota Celica GT, Standard
Section 125 (Multiplex Communication System)
2004 Toyota Celica GT, StandardSECTION Section 125 (Multiplex Communication System)
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
- Description & Operation
- Component Locations
- Trouble Shooting
- Self-Diagnostic System
- Connector Identification
- Diagnostic Tests
- DTC B1211: Driver Door Ecu Communication Stopped
- DTC B1212: Front Passenger Door Ecu Communication Stopped
- DTC B1214: Door System Communication Bus Malfunction (Short To Voltage) Or DTC B1215: Door System Communication Bus Malfunction (Short To Ground)
- DTC B1269: Theft Deterrent Ecu Communication Stopped
- Pin Voltage Tests
- Removal & Installation
- Wiring Diagrams
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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.