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 364 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS)PROBLEM SYMPTOMS TABLE
2004 Toyota Celica GT, Standard
Problem Symptoms Table
2004 Toyota Celica GT, StandardSECTION Problem Symptoms Table
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Confirm the problem symptom and make an Inspection depending on the applicable flowchart.
PROBLEM SYMPTOMS TABLE - MULTIPLEX COMMUNICATION SYSTEM
| Symptom | Suspected area |
|---|---|
| B1211 (No communication from driver door ECU for more than 10 seconds.) |
|
| B1212 (No communication from front passenger door ECU for more than 10 seconds) |
|
| B1214 (Communication circuit and +B battery system short), B1215 (Communication circuit and body ground short) |
|
| B1269 (No communication from theft deterrent ECU for more than 10 seconds) |
|
RENDER: 1.0x
NO RELATED
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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.